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A MATLAB toolbox for estimating the second moments of earthquake ruptures

Jeffrey J. McGuire
A MATLAB toolbox for estimating the second moments of earthquake ruptures
Seismological Research Letters (January 2017) 88 (2A): 371-378

Abstract

I present a set of routines in MATLAB for estimating the second-degree moments of an earthquake's rupture from far-field body waves. The second moments describe the length, width, duration, and directivity of a rupture. The second-moments approach is particularly useful when a seismic dataset is dense enough to resolve the primary finite-source properties but the geodetic data needed for a well-resolved finite-fault inversion are not available. In particular for M (sub w) 3-6 earthquakes, this approach can be a useful way to estimate rupture area without the assumptions of typical corner-frequency approaches. The provided software utilizes empirical Green's function deconvolution to isolate the apparent source time function (ASTF) for each station and phase. The spatial variations in the duration of the ASTF are quantified and inverted for the second moments. The inverse problem is solved using MATLAB's convex optimization routines for systems of linear matrix inequalities. An error analysis using the jackknife and bootstrap methods is included. An example M (sub w) 4.7 earthquake from the San Jacinto fault is used to demonstrate the method.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 88
Serial Issue: 2A
Title: A MATLAB toolbox for estimating the second moments of earthquake ruptures
Author(s): McGuire, Jeffrey J.
Affiliation: Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States
Pages: 371-378
Published: 20170118
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 23
Accession Number: 2017-015803
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201711
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