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

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Title: The purpose and definition of the minimum magnitude limit in PSHA calculations
Authors: Bommer, JJ
Crowley, H
Item Type: Journal Article
Abstract: A lower limit of magnitude Mmin 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 Mmin that points to the fact that seismic‐hazard assessment is always conditioned by the intended application of the outputs. We argue that Mmin 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.
Issue Date: 10-May-2017
Date of Acceptance: 11-Apr-2017
ISSN: 0895-0695
Publisher: Seismological Society of America
Start Page: 1097
End Page: 1106
Journal / Book Title: Seismological Research Letters
Volume: 88
Issue: 4
Copyright Statement: © Seismological Society of America.
Keywords: Geochemistry & Geophysics
0404 Geophysics
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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