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 PAVLIS, G. L. Articles by BOOKER, J. R. Search for Related Content GeoRef GeoRef Citation

Progressive multiple event location (PMEL)

GEOPHYSICS PROGRAM AK-50 University of Washington, SEATTLE, WASHINGTON 98195

Abstract

This paper introduces a new method of using earthquake arrival times to simultaneously determine earthquake hypocenters and station corrections. Progressive multiple event location (PMEL) forms a solution in three major steps: (1) hypocenters are located by conventional single event methods using current station correction estimates; (2) an annulled data set (Pavlis and Booker, 1980) is formed and accumulated using Householder transformations; and (3) station correction perturbations are calculated from a pseudoinverse solution of the annulled data set. In practice, PMEL converges rapidly. We analyze the non-uniqueness of PMEL estimates in terms of resolution and covariance matrices. One of the most important features of PMEL is the computer algorithm that we describe which requires only a modest amount of computer memory that is independent of the number of earthquakes to be processed. Consequently, this algorithm can process a virtually unlimited number of earthquakes.

We apply PMEL to a set of 8049 arrival times from 652 earthquakes and 4 explosions recorded by a network in the Coso Range, Inyo County, California. PMEL converges after four adjustments to the station corrections. The final rms misfit of 0.05 sec is remarkably good, and the station correction estimates correlate strongly with surface geology.

Footnotes

The present address of Gary L. Pavhs is: Department of Geology, Indiana University, Bloomington, Indiana 47405.

This article has been cited by other articles:

				C.-y. Bai and S. Greenhalgh 3D Local Earthquake Hypocenter Determination with an Irregular Shortest-Path Method Bulletin of the Seismological Society of America, December 1, 2006; 96(6): 2257 - 2268. [Abstract] [Full Text] [PDF]

				D. Reiter, W. Rodi, and M. Johnson Development of a Tomographic Upper-Mantle Velocity Model beneath Pakistan and Northern India for Improved Regional Seismic-Event Location Bulletin of the Seismological Society of America, June 1, 2005; 95(3): 926 - 940. [Abstract] [Full Text] [PDF]

				C.-P. Lee and Y.-B. Tsai Variations of P-Wave Travel-Time Residuals before and after the 1999 Chi-Chi, Taiwan, Earthquake Bulletin of the Seismological Society of America, December 1, 2004; 94(6): 2348 - 2365. [Abstract] [Full Text] [PDF]

				Seismicity of the Southern Great Lakes: Revised Earthquake Hypocenters and Possible Tectonic Controls Bulletin of the Seismological Society of America, October 1, 2004; 94(5): 1902 - 1918.

				Determination of a Local Magnitude Scale: A Generalized Inverse Solution Bulletin of the Seismological Society of America, December 1, 2003; 93(6): 2758 - 2761.

				On the Mathematics of Using Difference Operators to Relocate Earthquakes Bulletin of the Seismological Society of America, December 1, 2002; 92(8): 2879 - 2892.

				N. A. Ratchkovsky, J. Pujol, and N. N. Biswas Relocation of earthquakes in the Cook Inlet area, south central Alaska, using the joint hypocenter determination method Bulletin of the Seismological Society of America, June 1, 1997; 87(3): 620 - 636. [Abstract] [PDF]

				J. Pujol An integrated 3D velocity inversion--joint hypocentral determination relocation analysis of events in the Northridge area Bulletin of the Seismological Society of America, February 1, 1996; 86(1B): S138 - S155. [Abstract] [PDF]

				J. Pujol Application of the JHD technique to the Loma Prieta, California, mainshock-aftershock sequence and implications for earthquake location Bulletin of the Seismological Society of America, February 1, 1995; 85(1): 129 - 150. [Abstract] [PDF]

				J. PUJOL, J. M. CHIU, R. SMALLEY Jr., M. REGNIER, B. ISACKS, J. L. CHATELAIN, J. VLASITY, D. VLASITY, J. CASTANO, and N. PUEBLA Lateral velocity variations in the Andean foreland in Argentina determined with the JHD method Bulletin of the Seismological Society of America, December 1, 1991; 81(6): 2441 - 2457. [Abstract] [PDF]

				J. PUJOL, J.-M. CHIU, A. JOHNSTON, and B.-H. CHIN On the relocation of earthquake clusters. A case history: The Arkansas earthquake swarm Bulletin of the Seismological Society of America, December 1, 1989; 79(6): 1846 - 1862. [Abstract] [PDF]

				J. PUJOL Comments on the joint determination of hypocenters and station corrections Bulletin of the Seismological Society of America, June 1, 1988; 78(3): 1179 - 1189. [Abstract] [PDF]

				H. PULPAN and C. FROHLICH Geometry of the subducted plate near Kodiak Island and Lower Cook Inlet, Alaska, determined from relocated earthquake hypocenters Bulletin of the Seismological Society of America, June 1, 1985; 75(3): 791 - 810. [Abstract] [PDF]

				G. L. PAVLIS Comparison of earthquake travel-time residuals or how to compare apples to oranges Bulletin of the Seismological Society of America, December 1, 1984; 74(6): 2245 - 2255. [Abstract] [PDF]