| pub | pubpl | pubde | smem | pubda |
|---|---|---|---|---|
| Reid, unpub., Scrapbook and Cardfile, on microfilm at USGS in Menlo Park | NW WA & BC 49 degrees N; 122 degrees 40' W PST 11:09 pm 23 Jan, 1920 GMT 7h 09m 10s 24 Jan, 1920 VII-VIII 3 shocks duration 10 seconds -SB, IV, 112; MWR 64, 68; ? from Victoria, BC; BSSA, V (too small to read) Origin probably under Straight of Georgia. Windows broken and brick walls cracked at Bellingham, WA. Strongly felt at Vancouver, Victoria. Felt at Seattle. Probably felt for a distance of 120 miles or over an area of 45,000 sq mi. Tide guage at Victoria showed no movement of the water. Shifts near Mayna (?) ...Straits of Georgia felt the shock as th? struck by logs. | |||
| Monthly Weather Review | V. 48, p. 64 | Date:January 24, 1920 Time (Greenwich Civil): 7:14 Location: Anacortes, Wash Latitude (deg., min.): 48 50 Longitude (deg.,min.): 122 40 RF Intensity: 5 Number of Shocks: 2 Duration (sec.): Sounds: Loud Rumbling Remarks: Long Duration Observer:A. Allmond |
1920 | |
| Bulletin of the Seismological Society of America | V. 10, pp. 46-48 | Victoria, British Columbia, January 24, 1920. - At 7 hours 9 minutes and 16 seconds Victoria experienced a local earthquake of considerable intensity, and from the seimograph records obtained here both from the east-west horizontal pendulum and the vertical instruments, the center of the disturbances does not appear to have been more than twenty miles distant. The east-west seismograph indicated a sudden and pronounced movement, while the vertical instrument sustained a sudden jar sufficient to permanently displace the recording needle by .007 mm. and raise the needle off the paper for the first few seconds. The maximum amplitude of the maximum wave, which occurred four seconds after the first wave, was .214 mm. and the time interval two seconds. The number of seconds that the earthquake was felt varied considerably according to location and nature of foundation. Here on the rock and in this concrete building the earthquake was felt for about five seconds and consisted of two maximum vibrations, the latter being the most pronounced. Pictures on the wall moved slightly though no abnormal movement could be detected on hte recording pen of the barograph. In some sections of the city household articles were moved and considerable alarm prevailed, though no damage has been reported. From reports received from other districts it appears that the disturbance originated under the Strait of Georgia and to the northeast of Victoria. At Bellingham, Washington, a number of brick walls were cracked. At Anacortes, Washington, windows in some houses were broken and brick walls cracked. At Vancouver the earthquake was felt at 7 hours 9 minutes 35 seconds, or 19 seconds after the earthquake was recorded here. It was quite severe in certain districts and particularly at the tops of high buildings. At Brentwood on the Saanich Arm about 14 miles from Victoria the concrete chimney and wall of the electric power station was cracked. At Ladysmith our observer reported a distinct earthquake commencing 11 hours 10 minutes 30 seconds (Pacific time). The first shock lasted about seven seconds, followed in about a second by another lasting about the same time. The buildings shook and the windows rattled considerably. At Nanaimo our abserver reports an earthquake at 11:10 p.m. (Pacific time) which caused the substantial stone buildings to shake and the windows to rattle. At Port Alberni Mr. Allard of the E. & N. Railway staff reported an earthquake at 11:15 p.m. (Pacific time) lasting about four or five seconds. The intensity was mild compared with that of 1919, and nothing appeared to rock. From a close inspection of the Victoria tide gauge record, there does not appear to be any abnormal movement at the time of the earthquake. - F. Napier Denison, Meteorological Observatory, Gonzanles Heights, Victoria, B.C., January 29, 1920. Postscript, dated February 7, 1920. - I have just received word that the Dominion Governament ship "Estevan" which was anchored near Mayne Island at the time of the earthquake experienced several severe blows, as if striking on the rocks, and at the lighthouse nearby a metal chimney was damaged, The steamship "Quadra" also in this district experienced similar sharp blows resembling the striking of heavy logs. The maximum intensity appears to have occurred in the vicinity of Mayne Island which is to the northeast of Victoria. F. Napier Denison |
1920 | |
| Monthly Weather Review | V. 48, p. 64 | Date:January 24, 1920 Time (Greenwich Civil): 7:09 Location: Clallam Bay, Wash. Latitude (deg., min.): 48 15 Longitude (deg.,min.): 124 15 RF Intensity: 5 Number of Shocks: 3 Duration (sec.): 10-15 Sounds: Rumbling Remarks:Most severe ever noticed Observer:M. Rasmussen |
1920 | |
| Monthly Weather Review | V. 48, p. 64 | Date:January 24, 1920 Time (Greenwich Civil): 7:12 Location: Marietta, Wash. Latitude (deg., min.): 48 47 Longitude (deg.,min.): 122 35 RF Intensity: Number of Shocks: 2 Duration (sec.): Sounds: Rumbling Remarks Felt by many Observer:S.B. Mayhew |
1920 | |
| Monthly Weather Review | V. 48, p. 64 | Date:January 24, 1920 Time (Greenwich Civil): 7:15 Location: Tatoosh, Wash. Latitude (deg., min.): 48 23 Longitude (deg.,min.): 124 45 RF Intensity: 2 Number of Shocks: 3 Duration (sec.): Few Sounds: None Remarks: Felt by one Observer: Mrs. A.K. Willis |
1920 | |
| Monthly Weather Review | V. 48, p. 64 | Date:January 24, 1920 Time (Greenwich Civil): 7:20 Location: Forks, WA Latitude (deg., min.): 47 56 Longitude (deg.,min.): 124 20 RF Intensity: 5 Number of Shocks: 2 Duration (sec.): 60 Sounds: Faint rumbling Remarks:Many awakened Observer: Mrs. Ruth Johnson |
1920 | |
| Monthly Weather Review | V. 48, p. 68 | Seattle, Wash., January 24. Three distinct earthquake shocks were felt here at 11:08 o'clock last night. The tremors extended through Washington and British Columbia. At Bellingham, Wash., windows were broken and brick walls cracked. At Vancouver, B.C., people fled from buildiings in alarm, but the only damage reported was to telephone lines. Victoria, B.C., and numerous towns in northwest Washington felt the quake. No damage was reported in Seattle. | 1920 | |
| Post-Intelligencer | Seattle, WA | Saturday, January 24, 1920, p. 1, c. 5 | EARTH TREMORS FELT IN SEATTLE CENTER IN STRAIT Many Persons in This City Report Three Distinct Sharp Quakes JARS BRITISH COLUMBIA Windows Shattered, Walls Are Cracked and Phones Disabled at Northern Points Seismic disturbancees, resembling the earthquke shocks felt in Seattle about a year ago, but in three distinct tremors continuing for more than half a minute were felt in several different sections of Seattle shortly after 11 o'clock last night. Reports from Everett, Bellingham, and as far north as Victoria and Vancouver likewise told of tremors being experienced. At some points along the Great Northern railway in the Canadian border the shock was severe enough to spill the contents of inkwells. Shock Shatters Windows Windows were shattered in Anacortes and brick walls were cracked by the quake in Bellingham, according to long distance telephone messages received here late last night. Residents were disturbed by the shocks, which began at 11:08, and telphone calls to the offices of the Post-Intelligencer were received from many. Gould Mathis, head dispatcher for the Puget Sound Traction, Light and Power Company, stationed on the second floor of the Electric block, Seventh Avenue and Olive street, declared the earthquake was quite noticeable. "The shaking was of longer duration than last time," he said, "and I first felt a rocking notion of the building. A bunch of keys, suspended from a string in my room, swaued back and forth for about half a minute. There were three tremors." Buildings Are Rocked Residents in Olympian apartments, Sixteenth avenue and Madison street, on top of Capitol hill, reported that the waves were distinct tremors. "They shook the building three times," said one, "and were sharper and more insistent than a year ago. Many of the forty families in the apartments noticed them." Reports from Lakeview boulevard indicated that the shocks were noticed there also. VICTORIA FIRST SUSPECTS JAMES ISLAND EXPLOSION VICTORIA, B.C., Jan. 23, - A pronounced earthquake shock, described by F. Napier Denison ...Dominion observatory as of local origin, was felt here tonight at 11:10, the duration being five seconds. The center of the distrubance was in either the Strait of Juan de Fuca or the Strait of Georgia. It was felt at all island points that could be communicated with, but damage is reported from none of these. Considerable alarm was occaisioned here, as the first surmise was that there had been an explosion on James island. SIDE TO SIDE VIBRATIONS PERCEIVED IN VANCOUVER By Associated Press. Vancouver, B.C., Jan. 23. - One of the most severe earthquake shocks that has ever visited this vicinity shook the dity shortly after 1 o'clock tonight. No damage has been reported, beyond some telephones put out of commission. Victoria reported feeling the shock. Nanimo also felt it. The quake commenced approximately at 11:15 and lasted about a minute and fifteen seconds. The motion was lateral, several distinct side-to-side vibrations occurring, apparently in an east and west direction. A few bricks fell from the tops of chimneys. |
1920 |
| Friday Harbor Journal | Friday Harbor, WA | Thursday, January 29 | ISLANDS ARE ROCKED BY SLIGHT TREMBLOR Many People Awakened When Earth Begins to Rock The residents of Friday Harbor, and for that matter all of Northwest Washington, were awakened from their slumbers at 11 o'clock Friday night by an earthquake that shook buildings distinctly, rattled windows and swayed beds. The tremblor could be heard plainly for several seconds before the effects of the shock were noticeable. No damage has been reported in this vicinity. News reports state that brick walls were cracked in Anacortes, and Vancouver, B.C., reports it to have been the most severe quake ever felt there. As a result of the tremblor, quakes have been a subject of more or less conversation ..... (followed by general info about earthquakes RSL 5/1995) |
1920 |
| Anacortes American | Anacortes, WA | January 29 | EARTHQUAKE MAKES ANACORTES SHAKE AND PEOPLE RUSH TO STREET IN SCANT ATTIRE TEMBLOR STRIKES CITY FRIDAY EVENING AT 11:12 O'CLOCK AND LASTS APROXIMATELY THREE-QUARTERS OF A MINUTE - BUILDINGS AND RESIDENCES ARE ROCKED LIKE CORKS ON WAVE BUT LITTLE DAMAGE RESULTS. Late Friday evening the city of Anacortes, and a relatively small portion of the Sound region, was visited by a severe earhquake - one of the worst to visit this section- although, on the whold, but very little damage resulted. Business structures and reisdences were rocked severely and people in all parts of the city were filled with alarm. In hotels and rooming houses some tenants hurried to the streets in their night attire, while others crowded the halls ready to make their getaway if the temblor became stonger. This was particularly true in the three-story New Wilson hotel, where tenants on the third floor insist that the building swayed fully siz inches. None left the building, but there was great excitement for a brief period. So far as may be ascertained about the only real damage done in Anacortes was the cracking of one of the walls around Causland Park and the sidewalk at one corner; the breaking of a small window at the DeLuxe cafe and a few cracks in the walls of the New Wilson hotel lobby. These, however, were of minor importance but demonstrated the severity of the shock and the further fact that it would hbe required but little more to have thrown buildings to the ground. So far as learned the quake originated somewhere in British Columbia and traveled southward in a comparatively narrow path. Everett, to the southward, knew nothing of it until inquiry was made as to what damage had been done there. To the northward, Bellingham and Vancouver, B.C., reported the shake in about the same severity as that experienced at Anacortes, but without material damage. The only really strange feature about the temblor was the fact that the seismograph at Victoria registered three distinct shocks, the first one being at 9 o'clock in the evening, the second at the same time as the one felt here and the third at 2 o'clock in the morning. However, the one at 11:12 was the most severe. The other two were not felt other than at Victoria, so far as reported. |
1920 |
| Blaine Journal | Blaine, WA | January 30 | An earthquake shock last week cracked a number of brick walls in the vicinity of Bellingham. At Anacortes windows in a number of houses were broken by the force of the temblor, and brick walls were cracked. The quake was felt in varying degrees of intensity in a number of towns in the northwestern section of Washington. | 1920 |
| Port Angeles Evening News | Port Angeles, WA | Saturday, January 24 | EARTHQUAKE ROCKS MANY COAST CITIES Severe shock felt here lasting about fifteen seconds - originated on western coast of Vancouver Island. QUAKE CAME FROM VANCOUVER ISLAND The Evening News received the folowing telgram from the Victoria Times: Seismograph here registered shock at 11:12 p.,m. Quake originated west coast Vancouver Island, says F, Napier Denison, superintendent and was local in character, The tremor was five seconds long. An earthquake, originating as near as can be learned on the west coast of Vancouver Island, and continuing over to Tatoosh Island and down the Peninsula, reaching Up-sound cities also, rocked the earth here last night about 11:15. The quake started with a mild trembling, which rattled windows that were anyways loose, gradually increasing in force until it reached a jerky stage, and when it had reached the height of its force stopped abruptly, and was followed shortly afterwards by a light rumbling. Reports differ. Residents in Ediz Hook Spit state the shock was very severe. In other parts of town plates fell from plate rails, and the shelves of several local places of business rocked dangerously, (United Press) Seattle, Wash. Jan. 24. -- The earth did a shimmy hereabouts last night three different times. "It was shocking" late stayers-up reported. "Even the windows rattled in pane," and as if to hide her iniquity, the earth appeared at daybrak clad in a garment of pure white. Snow began falling at three a.m. The shocks were felt in Bellingham, Vancouver, and Anacortes where a few brick walls cracked and windows were shattered. Vancouver, B.C. reports that the shaking continued for a minute and a half. Victoria registered it at five seconds. Earthquake shows up local nuts If you were an editor and you had a telephone and everything just like all regulars do, and you came to work the morning after an earthquake, and the phone for which you pay $3.50 a month kept ringing and feminine voices kept saying: "Hello, is this the Evening News? Where was the earthquake?" what would you do after you ground your teeth and tore your hair? That's just what happened to us this morning, and we want to ask the forgiveness of the 400 people who called up and asked just that same question, because we answered them rather harshly - we simply said "It was right under our house" and hung up the phone. The wags were busy on the streets this morning and many were the ideas advanced. "They've struck oil at Forks," declared one excited strockholder. "and the explosion just nachally rocked the peninsula." "I always told you there was a hidden volcano in Mount Angeles." advanced another prophet. "What did I tell you - country went dry and started to crack," wheezed one of the old bar-rail cockroaches, as he went down into the cellar to see if his last pint of Old Crow was broken. "You editors want to watch out," said a storekeeper this morning. "That's a warning that the world is coming to an end." "Yes," we replied, "It may be, but the information seems to be coming from the wrong direction." "I'm gone," said Mack Davis, of the Dream theatre. I woke up last night and watched our bureau shimmy alll over the room." "Hardest shock since 1907," croaked one of the village bench whittlers, as he looked through the window to see if he could get a little free reading from the headlines. So to you 400 people who called "42" this morning will forgive our abruptness this morning, we'll do better next earthquake. We thank you. |
1920 |
| Monthly Weather Review | V. 48, p. 64 | Date:January 24, 1920 Time (Greenwich Civil): 7:10 Location: Blaine, Wash Latitude (deg., min.): 49 00 Longitude (deg.,min.): 122 45 RF Intensity: 4 Number of Shocks: 1 Duration (sec.): 8 Sounds: Rumbling Remarks: Felt by many Observer:J. Crilly |
1920 | |
| Morning Oregonian | Portland, OR | Saturday, January, 24, p. 1, c.2 | EARTHQUAKE SHAKES PUGET SOUND CITIES BRICK WALLLS CRACKED AND WINDOWS BROKEN Seattle, Bellingham and Vancouver, B.C., Rocked - Degrees of Intensity Are Varied Bellingham, Wash. Jan. 23. - An earthquake shock which cracked a number of brick walls in this vicinity was felt here shortly after 11 o'clock tonight. At Anacortes, Wash. near here, windows in a number of houses wre broken by the force of the temblor and brick walls were cracked, according to reports reaching here. The quake was felt in varying degrees of intensity in a number of towns in the northwestern section of Washington, it was reported. Seattle, Wash., Jan. 23 -- Three distinct earthquake shocks were felt here at 11:09 o'clock tonight. So far no material damage has been reported. Vancouver, B.C., Jan. 23. - One of the most severe eartquake shocks that ever visited this vicinity shook the city shortly after 11 o'clock this evening, Excited people rushed out of buildings, but up to the present no damage has been reported, beyond some telephones being put out of commission. Victoria reported feeling the same shock almost at the moment it occurred here, and a little later reports came from Nanaimo that the shock had been felt there. Some Vancouver people thought there had been an explosion at Nanaimo. |
1924 |
| Bradford, Donald C., 1935, Seismic History of the Puget Sound Basin, BSSA, V. 25, No. 2, pp. 138-153 | 1920 January 23, 11:09 p.m.; 49 degrees north, 122 degrees 40' west; northwest Washington and southwest British Columbia; cracked brick walls at Bellingham and Anacortes. | 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 | 1920 January 23. 11:09 p.m. VI to VII? Northwestern Washington. Strongest at Clallam Bay and Forks, Clallam Co., and at Anacortes; Skagit Co., and at Bellingham, where windows were broken and brick walls cracked. Three shocks at Clallam Bay; "most severe ever noticed" (?) Two shocks at Anacortes and Forks; duration "long" at Anacortes, sixty seconds at Forks. Felt at Blaine, Whatcom Co., IV; Marietta, Whatcom Co.; and Tatoosh, Clallam Co., three shocks.-MWR, 48, 64; BSSA, 10, 46. | 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 | 1920 JANUARY 23. 11:10 p.m. phi = 49 degrees N; lambda = 122 degrees 40' W. Br. The epicentre was again near the Gulf Islands, although the position cannot be very precise since there were few seismographs near the origin. At Victoria there was a severe shaking. Windows were broken at Anacortes, and plaster was cracked at Bellingham. One report states that boulders were shaken off Crown Mountain near Vancouver, and some windows were broken in the city itself. At New Westminster people were alarmed and ran into the streets. Some chimneys were cracked and furniture was moved in houses. (See BSSA, Vol. 10, pp. 46-48) Col., BSSA. | 1957 | ||
| Rasmussen, Norman, 1967, Washington state earthquakes 1840 through 1965, BSSA V. 57, No. 3, pp. 463-476 | 152 1920 Jan. 24 07:09 49.0 N, 122.7W VII 1 | 1967 | ||
| U. S. Dept. of Commerce, 1973, Earthquake History of the United States, V. 41-1, revised ed., pp. 89-96 | 1920. January 23. Northwestern Washington. Walls cracked at Bellingham and Anacortes. Epicenter probably under the Straits of Georgia. Strongly felt at Vancouver and Victoria, British Columbia. Some damage to houses on Vancouver Island. The crews of several vessels felt the shock. | 1973 | ||
| U. S. Dept. of Commerce, 1973, Earthquake History of the United States, V. 41-1, revised ed., pp. 89-96 | 1920 Jan. 23 23:09 Northwestern Washington 49.0 122.7 - 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 29, 1920 | Jan 23, 1920 CHILLIWACK PROGRESS, THE 01/29/1920 Chilliwack Progress, The, Chilliwack, B.C., January 29, 1920 "CITY FELT SHOCK OF EARTHQUAKE "The earthquake that shook the coast was distinctly felt in Chilliwack, several persons becoming slightly alarmed. From reports in of persons who were at the coast, the tremor here was very slight in corvarison and no damage has been recorded. While there it appears to have been a distinct swaying, here it was rather a shaking motion, rattling dooro and windows. "The quake occurred at 11:10 Friday evening and lasted for five seconds. At first many persons thought that the tremor was caused by the high wind then prevailing and some in the city put it down to a motor truck passing nearby. On the coast, rumbling sounds are said to have been heard." |
1977 | |
| 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. | 192001240709000 49000-122700 VII NO 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 |