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On the use of multiple-site estimations in probabilistic seismic-hazard assessment

Vladimir Sokolov and Alik Ismail-Zadeh
On the use of multiple-site estimations in probabilistic seismic-hazard assessment
Bulletin of the Seismological Society of America (August 2016) 106 (5): 2233-2243

Abstract

We analyze specific features of multiple-site (MS) probabilistic seismic-hazard assessment (PSHA), that is, the annual rate of ground-motion level exceedance in at least one of several sites of interest located within a defined area or along a linear extended object. The relation between MS hazard estimates and strong ground motion data obtained during large earthquakes is discussed in the cases of the 1999 Chi-Chi M (sub w) 7.6 and the 2008 Wenchuan M (sub w) 7.9 earthquakes. The strong-motion records obtained in the epicentral zones may be considered as examples of the ground motion exceeding the design level estimated using the conventional pointwise (PW) PSHA We show that the MS-PSHA, when being performed for the 475 yr standard return period, provides reasonable estimations of the intensity level that may occur during the earthquakes, parameters of which are close to the parameters of events with maximum possible magnitude accepted in PSHA for the regions. The MS-PSHA efficiency is discussed with respect to (1) evaluation of the performance of probabilistic seismic-hazard maps and (2) application of the MS hazard estimates as a basis for design loads. Based on the results of this work, we propose a multilevel approach to PSHA considering the fixed reference probability of exceedance (e.g., 10% in 50 yrs): (1) a standard PW-PSHA, to be performed in a seismic-prone region (first level), and (2) this analysis should be supplemented by an MS-PSHA for urban and industrial areas or for zones of a particular economic and social importance (second level).


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 106
Serial Issue: 5
Title: On the use of multiple-site estimations in probabilistic seismic-hazard assessment
Affiliation: Saudi Geological Survey, National Center for Earthquakes and Volcanoes, Jeddah, Saudi Arabia
Pages: 2233-2243
Published: 20160816
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 77
Accession Number: 2016-087259
Categories: SeismologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N20°00'00" - N53°00'00", E74°00'00" - E135°00'00"
N22°00'00" - N25°30'00", E119°15'00" - E122°00'00"
Secondary Affiliation: Karlsruhe Institute of Technology, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201642
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