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Studies of Wadati-Benioff Zone Seismicity of the Anchorage, Alaska, Region

¹ Department of Geological Sciences
University of Texas at El Paso
El Paso, Texas 79968-0555
 (D.I.D, A.M.V.)

² GX Technology Corporation
2101 CityWest Blvd.
Building III, Suite 900
Houston, Texas 77042
 (A.M.V.)

We have relocated over 8600 earthquakes occurring between 1964 and 1999 at depths >25 km within 100 km of Anchorage, Alaska, using the double- difference technique. The relocated seismicity reveals important details of the subducting Pacific plate and Yakutat blocks including clustering of seismicity within the Pacific plate mantle, northeast- and northwest-striking near-vertical faults within the Pacific plate crust, and a region of intense deformation associated with the southwestern edge of the Yakutat block. Stress analyses from the direct inversion of first- motion data and from inversion of focal mechanisms for 713 events indicates a rotation of the maximum compressive stress direction from a trench parallel direction (northeast) in the southwestern portion of the study area to an east–west direction near the southwestern edge of the Yakutat block located just north of Anchorage. Regions of the Pacific plate mantle that produced M_w >6.4 earthquakes in 1934 and 1954 continue to be seismically active.

This article has been cited by other articles:

				D. I. Doser and A. M. Veilleux A Comprehensive Study of the Seismicity of the Kenai Peninsula-Cook Inlet Region, South-Central Alaska Bulletin of the Seismological Society of America, August 1, 2009; 99(4): 2208 - 2222. [Abstract] [Full Text] [PDF]