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Periodically triggered seismicity at Mount Wrangell, Alaska, after the Sumatra earthquake
West, M.; Sánchez, J.J.; McNutt, S.R. (2005). Periodically triggered seismicity at Mount Wrangell, Alaska, after the Sumatra earthquake. Science (Wash.) 308(5725): 1144-1146. http://dx.doi.org/10.1126/science.1112462
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • West, M.
  • Sánchez, J.J.
  • McNutt, S.R.

Abstract
    As surface waves from the 26 December 2004 earthquake in Sumatra swept across Alaska, they triggered an 11-minute swarm of 14 local earthquakes near Mount Wrangell, almost 11,000 kilometers away. Earthquakes occurred at intervals of 20 to 30 seconds, in phase with the largest positive vertical ground displacements during the Rayleigh surface waves. We were able to observe this correlation because of the combination of unusually long surface waves and seismic stations near the local earthquakes. This phase of Rayleigh wave motion was dominated by horizontal extensional stresses reaching 25 kilopascals. These observations imply that local events were triggered by simple shear failure on normal faults.

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