A distal earthquake cluster concurrent with the 2006 explosive eruption of Augustine Volcano, Alaska

Fisher, M. A.; Ruppert, N. A.; White, R. A.; Wilson, F. H.; Comer, D.; Sliter, R. W.; Wong, F. L.

Abstract:

Clustered earthquakes located 25??km northeast of Augustine Volcano began about 6??months before and ceased soon after the volcano‘s 2006 explosive eruption. This distal seismicity formed a dense cluster less than 5??km across, in map view, and located in depth between 11??km and 16??km. This seismicity was contemporaneous with sharply increased shallow earthquake activity directly below the volcano‘s vent. Focal mechanisms for five events within the distal cluster show strike-slip fault movement. Cluster seismicity best defines a plane when it is projected onto a northeast-southwest cross section, suggesting that the seismogenic fault strikes northwest. However, two major structural trends intersect near Augustine Volcano, making it difficult to put the seismogenic fault into a regional-geologic context. Specifically, interpretation of marine multichannel seismic-reflection (MCS) data shows reverse faults, directly above the seismicity cluster, that trend northeast, parallel to the regional geologic strike but perpendicular to the fault suggested by the clustered seismicity. The seismogenic fault could be a reactivated basement structure.

Genre:

Article

ProdID:

70034864

Citation Author:

Fisher, M. A.; Ruppert, N. A.; White, R. A.; Wilson, F. H.; Comer, D.; Sliter, R. W.; Wong, F. L.

Citation Contributing Office:

Citation Datum:

Citation Day:

Citation Edition:

Citation Editor:

Citation End Page:

Citation Issue:

1-4

Citation Keywords:

Citation Language:

English

Citation Larger Work Title:

Tectonophysics

Citation LatN:

Citation LatS:

Citation LonE:

Citation LonW:

Citation Month:

Citation No Pagination:

Citation Number Of Pages:

Citation Online Only Flag:

Citation Phsyical Description:

Citation Projection:

Citation Public Comments:

Citation Publisher:

Citation Series:

Citation Series Code:

Citation Series Number:

Citation Search Results Text:

A distal earthquake cluster concurrent with the 2006 explosive eruption of Augustine Volcano, Alaska; 2009; Article; Journal; Tectonophysics; Fisher, M. A.; Ruppert, N. A.; White, R. A.; Wilson, F. H.; Comer, D.; Sliter, R. W.; Wong, F. L.