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Radiated Energy from the 16 October 1999 Hector Mine Earthquake: Regional and Teleseismic Estimates

Venkataraman, Anupama and Rivera, B. and Kanamori, Hiroo (2002) Radiated Energy from the 16 October 1999 Hector Mine Earthquake: Regional and Teleseismic Estimates. Bulletin of the Seismological Society of America, 92 (4). pp. 1256-1265. ISSN 0037-1106. doi:10.1785/0120000929.

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The amount of seismic energy radiated from an earthquake is a key macroscopic parameter for understanding the physics of earthquakes. To resolve the important details of the earthquake process, we require more accurate estimates of energy than are currently available. In this study, we determine the energy radiated from the M_(w) 7.1 16 October 1999 Hector Mine, California, earthquake using regional data from 67 TriNet stations. Earlier estimates of radiated energy from regional data used empirical path and station attenuation corrections. Here, we remove the path and station attenuation effects by using an empirical Green's function deconvolution. We use one foreshock and four aftershocks as empirical Green's functions and determine the source spectra. The radiated energy at each of the regional stations is computed from these source spectra. The energy estimates from the regional data are tightly clustered, with a mean estimate of 3.0 × 10^(15) J and a standard deviation of 0.9 × 1015 J. To calibrate the teleseismic methods currently used, we compare the energy estimates obtained above with the energy computed using two different teleseismic methods. The first method is based on the conventional National Earthquake Information Center (NEIC) method, in which the energy flux at each station is computed by squaring and integrating the corrected velocity spectrum. In the second method, we compute Green's functions for the appropriate source structure and deconvolve these from the mainshock data to obtain the source spectrum at each station. The energy is then calculated from the source spectra. The teleseismic energy estimates have a mean of 1.8 × 10^(15) J and 2.0 × 10^(15) J for the two methods, respectively. The average estimate of radiated energy from teleseismic data is nearly the same as that obtained from the regional data (3 × 10^(15) J). From the mean radiated energy (3 × 10^(15) J) and moment (6 × 10^(19) N m) estimates, the energy-to-moment ratio for the Hector Mine earthquake is 5 × 10^(–5).

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Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 2002 Seismological Society of America. Manuscript received 3 April 2001. We thank Dr. Yoshiaki Hisada for the code used to compute Green’s functions for stations and receivers close to the surface, Egill Hauksson for the Hector Mine earthquake catalog, and Lupei Zhu for the focal mechanism solutions of the mainshock and EGFs. We are grateful to Jeroen Ritsema for his help with the seismic tomographic model. We also thank J. Boatwright and S. K. Singh for their comments and suggestions to improve the manuscript. This study was partially supported by the United States Geological Survey Grant Number 99HQGR0035 and NSF Grant Number NSF-EAR-9909371. Contribution Number 8761 of the Division of Geological and Planetary Sciences, California Institute of Technology.
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Caltech Division of Geological and Planetary Sciences8761
Issue or Number:4
Record Number:CaltechAUTHORS:20140801-105906577
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Official Citation:Venkataraman, A., Rivera, L., & Kanamori, H. (2002). Radiated Energy from the 16 October 1999 Hector Mine Earthquake: Regional and Teleseismic Estimates. Bulletin of the Seismological Society of America, 92(4), 1256-1265. doi: 10.1785/0120000929
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47795
Deposited By: Jason Perez
Deposited On:01 Aug 2014 21:02
Last Modified:10 Nov 2021 17:50

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