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Estimation of moment magnitude and stress parameter from ShakeMap ground-motion parameters

Gail M. Atkinson, Behzad Hassani, Arpit Singh, Emrah Yenier and Karen Assatourians
Estimation of moment magnitude and stress parameter from ShakeMap ground-motion parameters
Bulletin of the Seismological Society of America (September 2015) 105 (5): 2572-2588

Abstract

We describe an efficient method to determine moment magnitude and stress parameter in near real time, in the immediate aftermath of a small-to-moderate earthquake ( M: approximately 3-6), from ShakeMap ground-motion parameters (5% damped pseudospectral acceleration) at 1 Hz, 0.33 Hz, 10 Hz and/or peak ground acceleration. The methodology is based on relating ShakeMap parameters to source and attenuation parameters within the context of a generic stochastic point-source model, to provide an event-specific ground-motion prediction equation (GMPE) that will reliably predict amplitudes. It is an approach that has been optimized for applications in regions with sparse networks; an example is provided for southern Ontario. In brief, we initially develop a simulation-guided generic GMPE model based on the available database in the region. We derive the applicable regional anelastic attenuation, stress parameter, and site amplification models. Then, using the estimated regional models, we show how to invert ShakeMaps parameters to estimate moment magnitude and stress parameter in near real time, to define an event-specific GMPE for an event that just happened. The event-specific GMPE can be used to provide robust, calibrated ShakeMaps that are fully consistent with ground-motion observations.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 105
Serial Issue: 5
Title: Estimation of moment magnitude and stress parameter from ShakeMap ground-motion parameters
Affiliation: Western University, Department of Earth Sciences, London, ON, Canada
Pages: 2572-2588
Published: 20150908
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 22
Accession Number: 2015-094185
Categories: SeismologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 6 tables, sketch map
N42°00'00" - N57°00'00", W95°00'00" - W74°00'00"
Secondary Affiliation: Indian Institute of Technology, IND, India
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: 201540
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