HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Ratchkovsky, N. A. Articles by Biswas, N. N. Search for Related Content GeoRef GeoRef Citation

Relocation of earthquakes in the Cook Inlet area, south central Alaska, using the joint hypocenter determination method

Geophysical Institute University of Alaska, Fairbanks, 903 Koyukuk Dr., Fairbanks, Alaska 99775-7320
Center for Earthquake Research and Information The University of Memphis, Memphis, Tennessee 38152

Abstract

The Joint Hypocenter Determination (JHD) method was used to relocate 1604 earthquakes that occurred during 1988 to 1993 in the Wadati-Benioff zone (WBZ) beneath the Cook Inlet in south central Alaska. The study utilizes both P- and S-wave arrivals recorded by a recently improved regional seismic network, and it provides an improvement over previous studies. The JHD locations of the events allowed improved delineation of the geometry of the subducted slab and the detection of a double seismic zone within the WBZ in the 40- to 100-km-depth range. The JHD station corrections obtained correlate with the major surface geological features in the study area (slow-velocity sedimentary basins) as well as with crustal and mantle structure (high-velocity subducting slab and low-velocity anomalies beneath the active volcanoes). To investigate the dependence of the JHD relocation procedure on factors such as the hypocentral depths of the events used, the velocity model, the _p/_s ratio, and random and systematic errors in travel-time readings, synthetic travel times were calculated using an exact raytracing technique, a three-dimensional tomographic P-wave velocity model, the present network configuration, and the actual seismicity distribution. Then, the synthetic events were located with the JHD algorithm. The synthetic experiments showed that the JHD procedure is rather insensitive to the choice of plane-layered velocity model and _p/_s ratio, preserves relative hypocenter locations well, and can handle systematic and large random reading errors effectively.

This article has been cited by other articles:

				A. M. Veilleux and D. I. Doser Studies of Wadati-Benioff Zone Seismicity of the Anchorage, Alaska, Region Bulletin of the Seismological Society of America, February 1, 2007; 97(1B): 52 - 62. [Abstract] [Full Text] [PDF]

				U. Dutta, T. Satoh, H. Kawase, T. Sato, N. Biswas, A. Martirosyan, and M. Dravinski S-Wave Velocity Structure of Sediments in Anchorage, Alaska, Estimated with Array Measurements of Microtremors Bulletin of the Seismological Society of America, February 1, 2007; 97(1B): 234 - 255. [Abstract] [Full Text] [PDF]

				C. Flores and D. I. Doser Shallow Seismicity of the Anchorage, Alaska, Region (1964-1999) Bulletin of the Seismological Society of America, October 1, 2005; 95(5): 1865 - 1879. [Abstract] [Full Text] [PDF]

				D. I. Doser Historical Seismicity (1918-1964) of the Kodiak Island Region Bulletin of the Seismological Society of America, June 1, 2005; 95(3): 878 - 895. [Abstract] [Full Text] [PDF]

				U. Dutta, N. N. Biswas, D. A. Adams, and A. Papageorgiou Analysis of S-Wave Attenuation in South-Central Alaska Bulletin of the Seismological Society of America, February 1, 2004; 94(1): 16 - 28. [Abstract] [Full Text] [PDF]

				Seismicity of the Kodiak Island Region (1964-2001) and Its Relation to the 1964 Great Alaska Earthquake Bulletin of the Seismological Society of America, December 1, 2002; 92(8): 3269 - 3292.

				Low-Frequency Properties of Intermediate-Focus Earthquakes Bulletin of the Seismological Society of America, August 1, 2002; 92(6): 2434 - 2448.

				New Evidence for Segmentation of the Alaska Subduction Zone Bulletin of the Seismological Society of America, June 1, 2002; 92(5): 1754 - 1765.

				New Constraints on Tectonics of Interior Alaska: Earthquake Locations, Source Mechanisms, and Stress Regime Bulletin of the Seismological Society of America, April 1, 2002; 92(3): 998 - 1014.

				A Study of Historic Earthquakes of the Prince William Sound, Alaska, Region Bulletin of the Seismological Society of America, August 1, 2001; 91(4): 842 - 857.

				Estimation of S-Wave Site Response in Anchorage, Alaska, from Weak-Motion Data Using Generalized Inversion Method Bulletin of the Seismological Society of America, April 1, 2001; 91(2): 335 - 346.

				Renewed Seismicity near Monticello Reservoir, South Carolina, 1996-1999 Bulletin of the Seismological Society of America, February 1, 2001; 91(1): 94 - 101.

				R. L. Bruhn, W. T. Parry, and M. P. Bunds Tectonics, fluid migration, and fluid pressure in a deformed forearc basin, Cook Inlet, Alaska GSA Bulletin, April 1, 2000; 112(4): 550 - 563. [Abstract] [Full Text] [PDF]

				S. Wiemer, G. Tytgat, M. Wyss, and U. Duenkel Evidence for shear-wave anisotropy in the mantle wedge beneath south central Alaska Bulletin of the Seismological Society of America, October 1, 1999; 89(5): 1313 - 1322. [Abstract] [PDF]