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Joint determination of event epicenter and magnitude from seismic intensities

Seongjun Park and Tae-Kyung Hong
Joint determination of event epicenter and magnitude from seismic intensities
Bulletin of the Seismological Society of America (March 2016) 106 (2): 499-511

Abstract

Characteristic features of seismicity with long recurrence intervals can be deduced from analysis of historical earthquake records that inherently suffer from uncertainty in the event locations and magnitudes. A novel method to determine the event epicenters and magnitudes jointly from seismic intensities is proposed. The probability for a set of event epicenter and magnitude is assessed by accounting the fitness between the observed and reference seismic intensities, spatial-occurrence probability based on seismicity density distribution, and temporal-occurrence probability from the Gutenberg-Richter magnitude-frequency relationship. A set of event epicenter and magnitude yielding the peak probability is chosen. The validity of the method is tested for both synthetic and instrumental seismic-intensity data, confirming high accuracy. The method is applied effectively to historical events with written seismic damage records. It is found that the errors generally decrease with increasing number and azimuthal coverage of seismic-intensity data, and increase with epicentral distances. The method appears to be promising for historical earthquakes of which source properties are poorly known. The method is applicable for assessment of the properties of long-period seismicity, which is crucial for assessment of potential seismic hazards.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 106
Serial Issue: 2
Title: Joint determination of event epicenter and magnitude from seismic intensities
Affiliation: Yonsei University, Department of Earth System Sciences, Seoul, South Korea
Pages: 499-511
Published: 20160322
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 62
Accession Number: 2016-034678
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N33°00'00" - N43°00'00", E124°15'00" - E130°00'00"
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: 201617
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