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The purpose and definition of the minimum magnitude limit in PSHA calculations

Julian J. Bommer and Helen Crowley
The purpose and definition of the minimum magnitude limit in PSHA calculations
Seismological Research Letters (May 2017) 88 (4): 1097-1106

Abstract

A lower limit of magnitude M (sub min) is routinely defined for integrations of earthquake scenarios in probabilistic seismic-hazard analysis but there is widespread misunderstanding of the technical bases for determining the value of this parameter. In this article, several misconceptions are identified and discarded prior to providing a clear and unambiguous definition of M (sub min) that points to the fact that seismic-hazard assessment is always conditioned by the intended application of the outputs. We argue that M (sub min) is therefore an engineering parameter that is ultimately related to seismic risk rather than seismic hazard. The confusion surrounding this topic could be largely alleviated by defining lower limits on appropriate intensity measures rather than on magnitudes used as a proxy for shaking levels.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 88
Serial Issue: 4
Title: The purpose and definition of the minimum magnitude limit in PSHA calculations
Affiliation: Imperial College London, Civil & Environmental Engineering, London, United Kingdom
Pages: 1097-1106
Published: 20170510
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 40
Accession Number: 2017-043869
Categories: SeismologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: European Centre for Training and Research in Earthquake Engineering, ITA, Italy
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: 201724
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