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Title: Modeling regional seismic waves. Final report, 26 September 1991-25 September 1992

Abstract

This research can be divided into two main topics: using the moment of regional Rayleigh waves and a regional magnitude based on the maximum amplitude of the shear wave train as a seismic discriminant and source retrieval from broadband regional seismograms. In section 1, we propose using the ratio of M sub L (local magnitude) to M sub O (Scalar Seismic Moment) as a regional discriminant analagous to the teleseismic discriminant using the m sub b; M sub s ratio. We applied this criterion to a data set of 299 earthquakes and 178 explosions and found that this ratio appears to be diagnostic of source type. This method does require the determination of regional crustal models and path calibrations from master events or by other means. In section 2, we develop and test a method of relocation and source characterization of small earthquakes using one modern regional station. First we model teleseismic body-waves of two events, which are used as masters. Short period depth phases, pP and sP, are used to establish the epicentral depth, and the events are relocated using calibrated stations and a mantle model derived for this region, TIP. The events moved upward by 12 and 31more » kms, respectively. Secondly, these events can be used as masters in the calibration of other systems, case-based event characterizations, etc.« less

Authors:
;
Publication Date:
Research Org.:
California Inst. of Tech., Pasadena, CA (United States). Seismological Lab.
OSTI Identifier:
5945543
Report Number(s):
AD-A-267295/4/XAB
CNN: F19628-90-K-0049
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; NUCLEAR EXPLOSION DETECTION; MATHEMATICAL MODELS; AFGHANISTAN; CALIBRATION; DEPTH; DIAGNOSTIC TECHNIQUES; EARTH CRUST; EARTH MANTLE; EARTHQUAKES; EPICENTERS; RAYLEIGH WAVES; REGIONAL ANALYSIS; SEISMIC DETECTION; SEISMIC WAVES; SEISMOGRAPHS; SEISMOLOGY; SEQUENTIAL SCANNING; SHEAR; ASIA; COUNTING TECHNIQUES; DETECTION; DEVELOPING COUNTRIES; DIMENSIONS; MEASURING INSTRUMENTS; SEISMIC ARRAYS; SEISMIC DETECTORS; SEISMIC EVENTS; SEISMIC SURFACE WAVES; 450300* - Military Technology, Weaponry, & National Defense- Nuclear Explosion Detection

Citation Formats

Helmberger, D V, and Harkrider, D G. Modeling regional seismic waves. Final report, 26 September 1991-25 September 1992. United States: N. p., 1992. Web.
Helmberger, D V, & Harkrider, D G. Modeling regional seismic waves. Final report, 26 September 1991-25 September 1992. United States.
Helmberger, D V, and Harkrider, D G. Tue . "Modeling regional seismic waves. Final report, 26 September 1991-25 September 1992". United States.
@article{osti_5945543,
title = {Modeling regional seismic waves. Final report, 26 September 1991-25 September 1992},
author = {Helmberger, D V and Harkrider, D G},
abstractNote = {This research can be divided into two main topics: using the moment of regional Rayleigh waves and a regional magnitude based on the maximum amplitude of the shear wave train as a seismic discriminant and source retrieval from broadband regional seismograms. In section 1, we propose using the ratio of M sub L (local magnitude) to M sub O (Scalar Seismic Moment) as a regional discriminant analagous to the teleseismic discriminant using the m sub b; M sub s ratio. We applied this criterion to a data set of 299 earthquakes and 178 explosions and found that this ratio appears to be diagnostic of source type. This method does require the determination of regional crustal models and path calibrations from master events or by other means. In section 2, we develop and test a method of relocation and source characterization of small earthquakes using one modern regional station. First we model teleseismic body-waves of two events, which are used as masters. Short period depth phases, pP and sP, are used to establish the epicentral depth, and the events are relocated using calibrated stations and a mantle model derived for this region, TIP. The events moved upward by 12 and 31 kms, respectively. Secondly, these events can be used as masters in the calibration of other systems, case-based event characterizations, etc.},
doi = {},
url = {https://www.osti.gov/biblio/5945543}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {3}
}

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