The November 1, 1918 Corfu earthquake had an epicentral
intensity of (MM) V-VI,  based  on  intensity  reports  from  the
town of Corfu, Washington,  and  on  reported  landslides  in  the
vicinity of Corfu. Based  on  the  seismograph  record  at  the
Gonzaga University  station  (SPO)  in  Spokane,  Washington,  it
is estimated that this earthquake  had  a  magnitude  (MS)  of
approximately 4.4.

The Corfu earthquake  and  aftershock  sequence  was  reported  in
the Bulletin of  the  Seismological  Society  of  America  (1918):

     The first shock was on  November  1st,  between  9:15  and
     9:30 a.m. This  was  the  most  severe  and  lasted  several
     seconds; it shook goods  from  the  shelves  and  caused
     landslides for  several  miles  along  the  hills.  We  have
     had on an  average  about  three  shocks  every  twenty-four
     hours since,  but  lighter.  The  intensity  is  estimated
     at IV of the RF Scale.

Bingham et al. (1970) refer to a  landslide  east  of  Smyrna
Bench, which they attribute  to  the  Corfu  earthquake,  but  it
was not  investigated in detail in their field studies.

Fifer (1966) gathered reports that suggests maximum
intensity (MM) IV at White Bluffs  which  is  located  26  km
northwest of the present plant site and 16 km south of
Corfu.  The White Bluffs felt reports ind;Lcate that the
epicenter was probably close to the town of Corfu.      This
further suggests that the site intensity was likely to be
less than (MM) IV.

The intensity data are shown in Figure 2.5-43 along with   an
arc corresponding to the S-P  time  of  21.7  seconds  measured
from the SPO record  of  the  event.  An  uncertainty  of
approximately 1 second or 8 km is  noted  for  the  S-P  time.
Based on these data, the most  likely  location  for  the  1918
event is considered to be  sligntly  east  of  Corfu,  within  the
central portion of the  epicentral  region  shown  in  Figure
2.5-43. The coordinates  for  this  point  are  listed  in  Table
2.5-5. The 1918  Corfu  earthquake  is  similar  in  location  to
the December 20, 1973, Mc4.4 Royal Slope Event, as
discussed in Appendix 2.5J.  The  Royal  Slope  Event  had  a
focal depth of 2.1 km  (Malone,  1979),  a  maximum  intensity  of
(MM) V, and was felt to a  distance  of  30  km  (Appendix  2.5I).