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TitleThe 26 December 2004, M 9.0 Sumatra earthquake: implications for Cascadia
AuthorCassidy, J FORCID logo; Rogers, G C; Dragert, H; Wang, KORCID logo
SourceSeismological Society of America Meeting 2005: abstracts volume; Seismological Research Letters vol. 76, no. 2, 2005 p. 220
Alt SeriesEarth Sciences Sector, Contribution Series 2004379
MeetingSeismological Society of America Meeting 2005; Reno, Nevada; US; April 8-22, 2005
ProvinceBritish Columbia; Western offshore region
Areasouthwestern British Columbia; Sumatra; Canada; Indonesia
Subjectstectonics; geophysics; plate tectonics; plate margins; subduction zones; earthquake studies; aftershocks; deformation; modelling; seismology; seismic risk; tectonic elements; tectonic models; structural features; faults; subsidence; tsunami; regional planning; Cascadia Subduction Zone; 2004 Sumatra Earthquake; Sumatra Subduction Zone; rupture characteristics; slip distribution; geological hazards; hazard reduction
ProgramNatural Hazards and Emergency Response
AbstractThe 26 December 2004, Mw 9.0 Sumatra earthquake, the world's largest earthquake in nearly 40 years, ruptured a subduction zone that is similar in many ways, to the Cascadia subduction zone. We compare the similarities (and differences) of these two subduction zones; and the observations, including rupture characteristics, slip distribution, deformation patterns, and aftershock patterns, with those predicted for Cascadia using theoretical modeling and interseismic observations. Both subduction zones are approximately 1,200 km in length. Both are relatively young plates, with similar convergence rates and oblique subduction. Slip along the subduction fault during the 26 December earthquake is estimated at 15-20 m, as is predicted for Cascadia. The width of the rupture, nearly 100 km as defined by aftershocks, is remarkably similar to the width of the "locked and transition zone" predicted for Cascadia. Coseismic subsidence of up to 2 m along the Sumatra coast is also similar to that predicted for parts of northern Cascadia, based on paleoseismic evidence. In addition to scientific studies, a number of preparedness iniatives are now underway to promote awareness of earthquake and tsunami hazards along the west coast, and plans are underway to upgrade tsunami and earthquake warning systems along Cascadia. Lessons learned from the great Sumatra earthquake and tsunami tragedy, both through scientific studies and through public education iniatives, should help reduce losses during future earthquakes in Cascadia.

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