1909

pub	pubpl	pubde	smem	pubda
Reid, unpub., Scrapbook and Cardfile, on microfilm at USGS in Menlo Park			Southwest BC 49 degrees 50' N; 122 degrees 40' W PST 3h 49m pm 11 Jan, 1909 VII-VIII, strong -SB, II, 92-94, IV, 21; Corresp. Origin in Northwest WA, see card. Felt probably over 25,000 sq mi.
Hand-written weather records	Port Townsend, WA	submitted by Ms. Betty J. Pfouts, Research Librarian, Jefferson County Historical Society, Port Townsend, WA	1904 Mar. 16 8:19 PM Earthquake 1907 July 28 2:20 AM Earthquake quite heavy 1909 Jun. 11 3:48 PM Earthquake very heavy 1925 Feb. 10 2:30 AM Earthquake 1929 April 22 6:18 PM Sl. earthquake 1932 July 17 10: PM Sl. earthquake 1936 July 24 9:25 PM Sl. earthquake 1939 Nov. 12 11:45 PM "Quite a tremor" 1915 Earthquake written in different writing on July misc. phenomena page and no date or time. [RSL 8/1995 - the date of Jun. 11 1909 appears to be an error. This entry must refer to the earthquake of *Jan* 11, 1909.]
American Reville (Morning Reville)	Bellingham, WA	Jan 12, 1909; pg 1 & 3; UW microfilm A4639 (Summary)	"Earthquake Shakes City - Shock which strikes here at 3:55 (Jan. 11) Does no damage, but causes wild and ludicrous panic among citizens -man runs up street in pajamas -woman insists on having the temblor stopped at once -towns of Puget Sound country feel shake-up" Rather severe shock of a duration of 11 seconds - frightened many (especially on upper floors) due to recent quakes in San Francisco and Italy Two distinct temblors Pedestrians staggered in the streets, signs and overhead wires swung plaster cracked in the office of the clerk of court, and a billboard was wrenched loose from the wall. "little felt in theaters" "Reports brought ... by steamers 'Islander' and 'Rosalie' were in effect that the Shock was much heavier on the gound and among the San Juan Islands than on the mainland. The report [is] that considerable damage was done to buildings at East Sound, Olga, Port Stanley and other points, where chimneys were shaken down and where several had narrow escapes from injury. When the temblor stuck the vessels the crew believed that their craft had run aground, so severe was the shock." Blaine is badly shaken - but only slight damage - duration 7 seconds - not felt at Hazelmere" Anacortes - duration 7 seconds - several windows broken, plaster cracked in many buildings Sedro-Wolley - general panic, no damage, duration 9 seconds Everett - two shocks of about 5 seconds duration occurred close together, buildings swayed, no damage Lyndon - frightened many - no damage Vancouver - duration 10-20 seconds, no damage felt heavily at Fairview, people rushed from their houses in Cedar Cove and Grand View Tacoma - duration 15-20 seconds, loose furniture on upper floors of offuce buildings was jostled about Seattle - duration 7-30 seconds in various parts of the city - no damage but people in a number of instances rushed from buildings. Also reported felt in Sumas, Port Townsend, Victoria, Deming, Mt. Vernon	1909
The Pacific Wave	UW, Seattle, WA	Tuesday, Jan. 12, 1909.	Campus Shaken By Big Tremor Endures Seven and a Half Minutes and Alarmed Professors Dismiss Classes. Movement Is Recorded Entire Puget Sound Region Affected but Disturbance Is Purely Local. For seven minutes and thirty seconds yesterday afternoon the university campus experienced earthquake shocks of an alarming though not necessarily dangerous character. The seismograph in the Science Hall recorded the first movement at thirteen minutes to 4 o'clock. The movement registered three-quarters of an inch upon the dial, the markings of which, however, are magnified ten times. No damage was done on the campus, although several professors, becoming alarmed, dismissed their classes, but in the city windows in the large office building were broken and occupants of offices frightened. For some time after the shock started residents of outlying districts kept busy the telephones of possible sources of information. Local Disturbance. The fact that the waves as recorded on the instrument are straight and near together, and that they are longer from east to west than from north to south, said C.H. Wheelon, assistant in the department of geology, who is in charge of the instrument, "would seem to indicate that the disturbance is purely local in character, very similar, no doubt, to the earthquake experience is Seattle in 1903. It is exceedingly difficult to account for this movement of the earth. This region is out of the earthquake zone. It might possibly be due to some change taking place in the nearby mountains." The Italian earthquake disaster was recorded by the seismograph during the holidays. The first indications on the dial were noticed between 8 and 9 o'clock in the morning of December 27, 1908. The violent shocks lasted twenty-six minutes according to the register, although the entire movement occupied a little over two hours.	1909
Tribune Times	Port Angeles, WA	Friday, Jan. 15, 1909	At about ten minutes to 4 o'clock on Monday afternoon this section was visited by the most severe earthquake that has ever been experienced since its inhabitation by white men. While no damage was done, the quake was so severe as to frighten the people badly and cause great excitment. Every building in this city, however low and flat, felt the very decided disturbance, and from the larger two or three-story buildings down town the occupants ran into the streets to see what was coming next, and to be safe in case of a heavier shock following. Immediately the telephone exchange became the storm center, everybody wanting everybody else to find out what the trouble was and whether any damage was done. No damage was reported in any quarter, and the net results were an excited populace and a general retailing from one to another of the people of how they were affected by the big quake. The disturbance began with a low, heavy and accelerating rumbling and shaking, as of some weighty truck load being trundled by the doors, and wound up with two distinct and terrific jolts separated by the fraction of a second. The main feature of the disturbance continued for a time of perhaps five or six seconds, variously estimated at different periods of length according to people's widely differing notions of elapsed time. The disturbance was general over the north pacific coast, and is now believed to have been heaviest in Alaska, this section experiencing the tail end of it. The cable to Alaska was broken somewhere off Vancouver Island, and up to yesterday no reports from the north had been received, there being apprehension in many quarters as to the fate of the Alasakan towns. In Port Angeles variuos interesting stories of the effects of the tremblor are being related. Some clocks were stopped, tight doors were loosened, loose doors swung open, tottering wood piles thrown down, plastering cracked and thrown from the ceiling in places, crockery, dishes and ware on the shelves rattled and moved from place. Some persons standing or walking on the streets at the time declare that they were almost thrown from their feet, by the swaying of the ground. While this is probably drawing it a little strong, the sway of the floors in the second and third stories was decidedly sufficient to make footing insecure, and had the tremble been but a little heavier much damage would certainly have been done in this locality. In the Tribune Times building, none too securely set upon its pins, the office force thought for a moment that final 30 had been struck in the newspaper business, and that it was time to enter upon the long reward prepared somewhere for all those who earn their living by doing printing. Our heavy pieces of machinery shook and swayed violently, the floor under them doing a dance that would have meant sea sick had it continued indefinitely. All in all, Port Angeles does not want any more such, or any stronger visitations of, earthquakes than was this one.	1909
Friday Harbor Journal	Friday Harbor, WA	Jan 14, 1909; UW microfilm A2358 (Summary)	Slight earthquake felt at 3:54 (Jan 11) in Friday Harbor a few bottles were shaken from the shelves of the Wright drug store. Olga- 3:30 PM duration 20 sec - Houses shook and windows rattled, people ran out of their homes and were very much frightened. overturned a lamp upon a table. Lopez- 4:30 PM Sharp and quick. Chimneys swayed and it is reported that Mr. Stalker lost one of his and that the top came off of Mr. Coffelt's. Considerable damage was done at the store - medicines, groceries and crockery fell...Several panes of glass were shattered, the flues were twisted and confusion reigned for a moment. A party skating on the lake rushed for shore. Walter Hutcheson was standing when the ice cracked near him and he was wet by the upspouting water. It is said that the water spouted several feet high through the cracked ice. Mr. Stedelin reported that he felt a second slight shake about twenty minutes after the first. Richardson reported that the quake was not severe	1909
San Juan Islander	Friday Harbor, WA	Jan 16, 1909; UW microfilm A2359, pg 1 (summary)	The severest earthquake shock within the recollection of the oldest residents at 4:50 in the afternoon Monday (Jan 11). Three distinct shocks were felt at that time, a slight one about 10 PM and another about midnight. All were accompanied by a rumbling noise. From the fact that the temblors seemed to move from the north to south and that the Alaska cable was broken shortly before the shocks were felt here it was thought possible that there had been a severe earhquake or volcanic eruption in .. Alaska, but ... such was not the case. Here buildings rocked enough to crack some chimneys, stop clocks, and cause some breakage of window glass, crockery, etc. In the valley, the large chimneys on P.E. Peterson's house were shaken down as were also one of the chimneys of Chas. Peterson's house at Argyle nad one on Mrs. Schmidt's house of Kanaka Bay. Most of the monuments in the cemetary were moved. Here in town Dr. Wright is the only one who suffered damage worth mentioning. In his drug store a large number of bottles and medicines were thrown from the shelves and broken, and one chimney on the drug store building and one on his residence were cracked and moved horizontally so as to necessitate rebuilding them from the roofs up. Navigators and others out on the water, whether in large or small craft report that when the first shock occurred their first thought was that their boats had struck submerged logs or unknown reefs. The captain of the Roalie ordered the engines reversed thinking that the vessel had struck a big log or rock. Old settlers say that a similar shock was experienced here about 25 years ago but it was of shorter duration and less severe.	1909
Oregonian	Portland, OR	Jan 12, 1909; pg 1, col 7	1909, Jan 11, Monday. Puget Sound, severe at northern cities, walls cracked, clocks stopped, 3:50 PM. EARTH TREMBLES ON PUGET SOUND SEVERE SHOCKS EXTEND OVER WIDE AREA. ALASKA CABLE IS SNAPPED Water Pipes Broken in Port Townsend, Houses Flooded. People Flee To Street Buildings Cracked at Blaine--Bellingham Reports Mount Baker Smoking--Crockery Broken and Clocks Are Stopped. Seattle, Wash., Jan 11.--(Special)-- Just on the eve of sending $10,000 to the quake-stricken inhabitants of Europe for relief from devastation and horror, the entire Northwest awoke to the realization this afternoon that it had a fair-sized trembler of its own to cope with, and there were many who showed perceptible signs of being panic-stricken. From exactly 3:50 o'clock and until seven minutes and 30 seconds after that time, the seismograph at the University station showed activity. During this time for at least 15 seconds, the movement was so strong as to cause many persons living in tall buildings to flee into the halls and wildly attempt to get on the ground floor in elevators. The movement was north and south. Blaine Building Cracked. While damage was reported in Seattle, Northwestern cities as far away as towns in Northern British Columbia report unusual conditions. Cities in Northwestern Washington all were affected and from Blaine comes the report that there are but two brick and concrete structures in the whole town that do not show signs of the shake. These appear in seams running from a fine point to the width of an inch. At Port Angeles the shock was extremely severe. It began with a heavy and accelerated rumbling and wound up with two distinct shocks within a second's time. Clocks were stopped and dishes on plate racks and bric-a-brac were thrown to the floor. Wares on store shelves were rattled and thrown down. Almost the entire population became terror-stricken and ran into the streets. Plastering left the walls in the three-story buildings and some who were walking claim to have been almost taken off their feet. The same condition is reported from Fort Worden, near Port Townsend, and at the fort is it is reported that stoves fell, bringing down pipe and all. Anacortes reports a shock lasting about 16 seconds, with no damage. Bellingham reports a severe disturbance and a cracked plate glass or two. At 2:05 o'clock this afternoon the Alaskan cable went down and by cable authorities it is hinted that severe shocks have been going on all day in that portion of the country. From Snohomish it is reported that three heavy shocks were experienced, and at Hamilton, in the upper Skagit Valley, the shocks lasted at least half a minute, and men walking were staggering for that length of time. Burlington and Everett experienced alarm, as these places were visited. Wireless Mast Is Boosted. At Friday Harbor wireless reports received say the shake jarred loose chimneys and cracked the ice in ponds where skaters were busy enjoying a Winter's sport. At the Friday Harbor Bugge store, bottles were thrown from the shelves and considerable damage resulted. The wireless mast on Bald Hill was raised three inches. The shock was felt at Vancouver, B.C., six minutes before it was felt in Seattle, and a message states that buildings were shaken there to a noticeable degree. Tonight all Seattle is talking about the quake and the experiences of the people who were in position to notice its effect. In the Alaska building on the twelfth floor many ran from the scene frightened and sought safety. Lights went out, adding to the confusion. In some parts of the city plates were shaken from their racks and fell crashing to the floors. Damage At Port Townsend Water Pipes Burst by Shock of Earthquake and Houses Flooded. Port Townsend, Wash., Jan 11.-- An earthquake shock of sufficient severity to cause considerable damage was felt here at 3:50 this afternoon, lasting from ten to 15 seconds. The trembling took the form of a vibratory convulsion, swaying buildings and breaking many windows and fragile roofs. Reports from nearby localities by telephone state that the force of the shock extended over an area of country at least 50 miles square, and in several districts two distinct shocks, separated by more than a minute were felt. A general shaking up of the premises occurred in many parts of Port Townsend where water pipes had been frozen in the prevailing spell of cold weather. The force of the earthquake shock burst the mains flooding the houses before a stoppage of the intake could be effected. For a time it was feared that the city's entire water supply must be shut off, so great was the damage being done. Offices of the Puget Sound artillery, district state from Fort Worden that with what investigation has thus far been possible no apparent damage to the important defences has been caused, although the localities of Forts Worden and Flagier were badly shaken. Signal Corps offices report the parting of the Alaska cable several hours previous to the shock here. A circumstance that will be investigated to ascertain, if possible, any connection between the occurrences. Bad Panic At Bellingham Buildings Sway, Plaster Cracks and People Rush Into Streets. Bellingham, Wash., Jan 11.-- Bellingham was shaken at 3:55 this afternoon by an earthquake shock which broke lamps, cracked plaster and created a wild panic, especially in the downtown office buildings. The trembler was of two seconds' duration. It started with a slight jar and increased in intensity until some of the high buildings swayed dangerously. Buildings and residences were immediately emptied and their occupants poured out into the street, some of them in ludicrous undress, and ran up and down distractedly. Reports from all parts of Northwestern Washington report a shock at the same time, and of about the same intensity. At Blaine, Wash., several buildings were slightly damaged, otherwise the damage is negligible in this territory. The fact that this is the first shock felt here for many years and the most severe ever experienced explains the unreasoning panic which seems to have accompanied the temblor in all the towns in the vicinity. Aberdeen Sways Like Ship Earthquake At Grays Harbor City Is Distinctly Felt. Aberdeen, Wash., Jan 11.-- A distinct earthquake was felt in this city about three minutes after four this afternoon. Dr. D. A. Schumacher and Dr. and Mrs. Canterbury, with offices in the Bank building, report feeling the swaying motion, which lasted for several seconds. They were confident it was not a jar, but a slight swinging motion like a ship rolling. At the Bacona, a house full of guests felt the same motion. The jar was sufficient to set the lamps, suspended by a cord, swaying. Mrs. Bacon was at the telephone and said she could feel the wall sway. Other reports corroberate this afternoon. Victoria Feels Earth Shake Shock Distinctly Felt Over South End Vancouver Island. Victoria, B.C., Jan 11-- Some excitement was occasioned here by a slight shock of earthquake, which was generally felt over the south end of Vancouver Island and is also reported to have been felt on San Juan Island and at Vancouver and Seattle at 3:50 PM today. No damage was occasioned beyond the breaking of some crockery in a few homes. Comox, Alberni, Pachena, Bamfield and other points report having felt the shock, and state that two tremors were felt. Estevan says no shock was experienced there. Tacoma Slightly Jarred. Tacoma, Jan 11.-- A distinct tremor of the earth was felt in Tacoma at 3:45 o'clock this afternoon. It lasted between ten and 15 seconds. Loose furniture in the upper floors of the taller office buildings was jostled about.	1909
Leslie M. Scott, Memoranda of the Files of the Oregonian 1850-1910, Oregon Historical Society	Portland, OR	Unpublished index to the Oregonian	at Puget Sound, severe at northern cities, walls cracked, clocks stopped, 3:50 p.m., Jan. 11, 1909	1910
Bradford, Donald C., 1935, Seismic History of the Puget Sound Basin, BSSA, V. 25, No. 2, pp. 138-153			1909 January 11, afternoon; northwest corner of Washington; great enough to crack walls in Blaine and to crack plaster and twist sidewalks in Bellingham. Reid estimates the intensity at from VII to VIII. At Anacortes some of the piers were slightly damaged. Felt at Olympia and Aberdeen. Felt over 25,000 square miles or more.	1935
Townley, S. D. and M. W. Allen, 1939, Descriptive Catalog of Earthquakes of the Pacific Coast of the United States 1769-1928, Chap. III Earthquakes in Washington, 1883-1928, BSSA, V. 29, No. 1, pp. 259-268			1909 January 11. 3:50 p.m. VIII? Northwest Washington. A shock which seemed to center in the Strait of Juan de Fuca or along or off the south end of Vancouver Island was felt through much of British Columbia and as far south as Portland, Oregon. The shock was reported violent at Dungeness, Port Angeles, Crescent, Neah Bay; while chimneys were reported demolished at Vancouver and Westminster and some damage, including a cracked sidewalk, was done at Anacortes. The many press accounts from northwestern cities agreed that the intensity rose as Cape Flattery was approached, and the seismograph at Seattle recorded a shock for more than seven minutes from a source said to have been some distance from Seattle to the northward. Intensities ranging from VI to nearly VIII were reported from all places in Wash-ington north and northwest of Seattle from which news was received. At Port Angeles on the Strait of Juan de Fuca, lumber piles were toppled over and people nearly thrown from their feet. About Puget Sound at Seattle, Everett, Bellingham, and Port Townsend, the intensity ranged about VI or VII, with little or no damage,but considerable alarm resulted. The shock appears to have been felt to distances of about two hundred miles north and south of the Strait of Juan de Fuca. Shaken area was of the order of one hundred thousand square miles. Numerous press items in Seattle, Port Angeles, and other papers of the northwest; Reid's Scrapbook, 2, 92, 93, 94, 98, 99; 3, 21.	1939
Milne, W.G., 1956, Seismic Activity in Canada, west of the 113th meridian 1841-1951: Canada Dominion Obs. Pub., V. 18, No. 7, pp. 119-146			1909 JANUARY 11. 3:44 p.m. A tremor, whose origin seems to have been in the Gulf Islands between Victoria and Bellingham, was felt over an area greater than 25,000 square miles. The intensity near the origin was of the order of VI At Victoria, where the vibration lasted from 10 to 20 seconds, the most serious damage reported was that of broken crockery. At Blaine walls were cracked; Bellingham reported sidewalks twisted; and at Anacortes the piers were damaged. Ladysmith, Nanaimo, and Alberni felt the tremor quite distinctly. Reports indicate that the earthquake was felt at Comox, Pachena Point, Bamfield, Sumas, Chilliwack, Hammond, Everett, Lopez, Port Townsend, Tacoma, and south to Portland, but was not felt as far east as Kelowna, Princeton or Vernon. It appears that placing the epicentre in the Gulf Islands area is as good an approximation as is possible, for no instrumental recording of the origin is available. Col., BSSA	1957
Rasmussen, Norman, 1967, Washington state earthquakes 1840 through 1965, BSSA V. 57, No. 3, pp. 463-476			108 1909 Jan. 11 23:49 49.0 N, 122.7 W VII 1 felt over 25,000 sq. mi.	1967
Port Angeles Public Library cardfile	Port Angeles	Alphabetic cardfile of references to newspaper articles prior to 1971	Earthquake tremor, Sunday July 28, 1907 2:18 a.m. First since 1890 Earthquake Olympic Leader Jan. 15, 1909 Two earth tremors at 8:06 O'clock Friday evening shook Port Angeles and the Peninsula PAEN 5-5-34	1971
U. S. Dept. of Commerce, 1973, Earthquake History of the United States, V. 41-1, revised ed., pp. 89-96			1909. January 11. Northwestern Washington. Walls cracked at Blaine; plaster thrown down at Bellingham. Sidewalks twisted and piers were slightly damaged at Anacortes. Felt at Olympia and Aberdeen.	1973
U. S. Dept. of Commerce, 1973, Earthquake History of the United States, V. 41-1, revised ed., pp. 89-96			1909 Jan. 11 15:49 Northwestern Washington 49.0 122.7 25,000 VII 3-25,56	1973
Washington Public Power Supply System, Preliminary Safety Analysis Report, Ammendment 23, WPPSS Nuclear Project No. 1, 1300 MW Nuclear Power Plant, Vol. 2A.		Tables 2R-E16 and 2R-E14B. Chilliwack Progress, The, Chilliwack, B.C., January 13, 1909	Jan 11, 1909 CHILLIWACK PROGRESS, THE 01/19/1909 Chilliwack Progress, The, Chilliwack, B.C., January 13, 1909 "CHILLIWACK HAD AN EARTHQUAKE "A Slight Earth Tremor Distinctly Felt on Monday Afternoon by the House Dwellers. "Dishes, Pictures and wall Bric-a-Bric Rattled and Swayed for about Seven Seconds. "Not to be behind and out of the fashion with other places of importance, Chilliwack experienced about 3:45 p.m. on Monday, a slight shock of earthquake. The shock was quite perceptible to those in the houses but those upon the street felt nothing of it. "The tremor or shock lasted about seven seconds and set dishes and windows rattling and pictuple are reported as alarmed. There were three distinct shocks recorded on the instruments at Harrison House."	1977
Washington Public Power Supply System, Preliminary Safety Analysis Report, Ammendment 23, WPPSS Nuclear Project No. 1, 1300 MW Nuclear Power Plant, Vol. 2A.		Tables 2R-E16 and 2R-E14B. Chilliwack Progress, The, Chilliwack, B.C., August 19, 1915	Aug 18, 1915 CHILLIWACK PROGRESS, THE 08/19/1915 Chilliwack Progress, The, Chilliwack, B.C., August 19, 1915 "CHILLIWACK VALLEY EXPERIENCES SHAKE "Late sleepers rudely awakened by a general shaking up of surrounding no damage. "Chilliwack city and valley experienced a real live shake yesterday morning a few minutes after six o'clock, which lasted several seconds. The tremor was the most pronounced experienced since 1871, and was sufficient to arouse late sleepers, by the shaking of houses and the rattling of windows. Whether the shake was caused by a real earthquake or the fall of a massive glacier in the mountains caused by a long season of dry weather is a matter of conjecture. "The latter view is accepted by many from the fact that the dis-- turbance appears to have been confined to the valley, including the Agassiz district. In 1871, it was discovered after the shock of that time, that a big slice of Mt. Cheam peak had dropped about one thousand feet. " __________________________________ Vernon News, The, August 19, 1915 "TOWN AND DISTRICT "A slight earthquake shock was felt by many in this city on Wednesday morning shortly after five o'clock. it seems to have been a little more noticeable at Coldstream than in town." _______________________________________________ Penticton Herald, The, Penticton, B.C., August 19, 1915 "SMALL QUAKE WAS FELT IN PENTICTON "Earth tremor was noticeable all over province - from Mount Baker. "A distinct earth tremor was felt here at 6:05 o'clock yesterday morning. Dishes rattled on the pantry shelves, furniture and fixtures in the houses shook and citilens generally accustomed to waiting until the respectable hour of eight before waking in the morning woke rather suddenly. "it is seven years since there was any evidence of an earthquake shock in Penticton. Two years ago, there was a very distinct shock in Vancouver and several buildings were slightly strained. "Insofar as can be learned absolutely no damage was done here on Wednesday. The houses shook for two or three seconds as if in a very strong gale, but that was all. Most of the sleepers in the upper floors woke up, but those slumbering closer to the ground, say that they did not know that there was a tremor at all. _______________________________________________	1977
Woodward Clyde Consultants, unpublished		Woodward-Clyde Consultants (1981), Historical Catalog (1841-1980) for the Pacific Northwest Region, unpublished catalog prepared for the Washington Public Power Supply System. Copy provided to UW in 1993.	190901112349000 48700-122800 VII 600 CA 7 01	1981
Garry Colin Rogers, Seismotectonics of British Coulmbia, PhD Thesis		PhD Thesis, Dept. of Geophysics and Astronomy, University of British Columbia, pp. 19-27 and p. 228	TABLE Il Larger Historic Vancouver Island - Puget Sound Earthquakes Their Felt Area (In square KM -RSL 6/95) and Resulting Magnitude FELT PREVIOUS(1) FELT AREA (2) DATE COORDINATES AREA MAGNITUDE MAGNITUDE 1872 DEC 14 48.6 121.4 1010,000 - 7.3 1903 MAR 14 47.7 122.2 26,000* 4.3 4.9 1904 MAR 17 47.8 123.0 50,000* 6.0 5.3 1909 JAN 11 48.7 122.8 150,000 5.6 6.0 1911 SEP 29 48.8 122.7 8,000 4.3 4.1 1913 DEC 25 47.7 122.5 20,000* 4.3 4.7 1915 AUG 18 48.5 121.4 77,000* 5.5 4.6 (This magnitude is a typographic error in Roger's thesis correct magnitude should be 5.6, based on the felt area given here RSL 6/95) 1918 DEC 06 49.5 125.9 650,000 7.0 7.0 1920 JAN 24 48.6 123.0 70,000 5.0 5.5 1923 FEB 12 49.0 122.7 8,000 4.3 4.1 1926 DEC 04 48.5 123.0 30,000 4.3 5.0 1928 FEB 09 49.0 125.3 120,000 3.7 5.8 (List continues through 1965 - RSL 6/1995) *Felt area from "Earthquake History of the United States" by Coffman and von Hake (1973). 1)Magnitude in the Canadian Earthquake Data File. 2)Calculated using Toppozada's (1975) relationships 5) Comments on Revisions of Some Key Earthquakes (Figure 6) a) March 16, 1904 In the Canadian Earthquake Data File the epicentre for this event was located on the west side of the Olympic Peninsula and it was assigned a magnitude of 6. in "Earthquake History of the United States" it is given the location of Victoria, B.C. and assigned an intensity value of V. A study of felt levels from newspaper reports suggests the earthquake has an epicentre along the west side of Puget Sound, south of Port Townsend and that the magnitude is about 5. The confirmation that this earthquake was not near the west coast of the Olympic Peninsula is important as no large earthquakes have yet been located along the coast. b) January 11, 1909 Felt reports from newspapers limit this epicentre to the San Juan Islands region where several instances of damage occurred. Felt information also clearly shows that the size of the isoseismal maps is between that for the 1965 Seattle earthquake and the 1976 Gulf Islands earthquake (Figure 7). The magnitude is about 6 according to Toppozada's (1975) felt area relationship. Lack of aftershocks and lack of higher intensities in the epicentral region suggest this event belongs to the deeper suite of earthquakes. This event is significant because it points out that large earthquakes in the deeper suite can also occur north of Puget Sound. c) December 6, 1918 This earthquake has several epicentres in the literature which are shown in Figure 8. Investigations with the set of P arrival times listed in the ISS place the epicentre on Vancouver Island near the west coast, south of the present town of Gold River which did not exist in 1918. Because of the quality of 1918 arrival times this epicentre has an uncertainty of the order of + 50 km. Felt information collected by Dennison (1919) and supplemented by newspaper investigations suggest the magnitude of 7 (Ms) calculated by Gutenberg and Richter (1949) is correct. d) February 9, 1928 Felt information and a 100 mile distance issued from the Victoria seismograph station (VGZ), presumably from the S-P interval, indicates the earthquake was in the vicinity of Barkely Sound and had a magnitude of about 5-3/4. This event was in the Canadian Earthquake Data File but was located in the Strait of Juan de Fuca with a magnitude of 3.7. It is significant that an earthquake of this size occurred in the Barkely Sound region as there have been no events above magnitude 4 in that region since 1928. e) September 17, 1926 and May 7, 1927 Both of these events were assigned epicentres by the ISS at the location previously calculated for the epicentre of the December 6, 1918 earthquake (Figure 8). Because of the proximity of the cities of Nanaimo and Victoria and the distribution of population close to the ISS epicentral region, these earthquakes could not have been located there as they would have been felt. With the data listed in the ISS and felt reports they were located elsewhere. The 1927 event occurred in the vicinity of Brooks Peninsula on Vancouver Island and the 1926 event occurred on the mainland north of Vancouver (see Appendix 1). APPENDIX 1 - Revised parameters fir earthquakes in the Vancouver Island-Puget Sound Region 1900-1950 ( P 128. - Included here are 1900-1928; Times apparently GMT -RSL 5/95) YEAR DATE TIME LAT LONG MAG 1903 Mar. 14 02:15 47.7 122.2 4.9 Location from "EQ Hist. of the US.", mag. from felt area 1904 Mar. 17 04:21 47.8 123.0 5.3 Location from "EQ Hist. of the US.", mag. from felt area 1909 Jan. 11 23:49 48.7 122.8 6.0 Location based on felt reports, mag. from felt area 1911 Sept. 29 02:39 48.8 122.7 4.1 Location from "EQ Hist. of the US.", mag. from felt area 1913 Dec. 25 14:40 47.7 122.5 4.7 Location from "EQ Hist. of the US.", mag. from felt area 1915 Aug. 18 14:05 48.5 121.4 4.6 Location from "EQ Hist. of the US.", mag. from felt area (Note - the magnitude of 4.6 is due to a typographical error in Table 1 of Roger's thesis. The correct magnitude, based on a felt area of 77,000 square km is 5.6 RSL 6/95) 1918 Dec. 06 08:41:05.8 49.62 125.92 7.0 Recalc. from ISS data. Mag. from Gutenberg and Richter (1949) and felt area. 1919 Oct. 10 01:07:16.5 48.63 127.15 5.5 Recalc. from ISS data. Mag. estimated from the number of P arrivals. 1920 Jan. 24 07:10 48.6 123.0 5.5 Location from "EQ Hist. of the US.", mag. from felt area 1923 Feb. 12 18:30 49.0 122.7 4.1 Location from "EQ Hist. of the US.", mag. from felt area 1926 Sept. 17 23:14:40 50.0 123.0 5.5 Recalc. from ISS data. Mag. estimated from the number of P arrivals. This event was previously identified as occurring on Sept. 7 at 22:14:36 1926 Dec. 4 13:55 48.5 123.0 5.0 Location based on felt reports, Magnitude from felt area 1927 May 7 21:56 50.15 127.85 5.5 Gonzales (VGZ) S-P and felt reports are similar to 1978 Brooks Peninsula events, thus this epicentre is used. Magnitude from felt area. This event was previously identified as occurring on May 8 at 14:00. 1928 Feb. 9 11:05 49.0 125.3 5.8 Location on the basis of Gonzales (VGZ) S-P and felt reports. Magnitude from felt area.	1983

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