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Evidence for strong ground motion by waves refracted from the Conrad discontinuity

Xiaobo He and Tae-Kyung Hong
Evidence for strong ground motion by waves refracted from the Conrad discontinuity
Bulletin of the Seismological Society of America (June 2010) 100 (3): 1370-1374

Abstract

The Conrad discontinuity, a boundary between the upper and the lower crusts, has long been identified in many continental crusts. The influence of the Conrad discontinuity on seismic hazards, however, has been rarely known. Strong regional phases corresponding to the waves refracted from the Conrad discontinuity are observed in the Korean Peninsula. These phases show strong amplitudes of 2-4 times larger than those of the direct waves. The observation is confirmed by numerical modeling of waveforms. These observations not only support the existence of the Conrad discontinuity in the Korean Peninsula but also suggest the potential of seismic hazards by the Conrad phases. Such strong Conrad-refracted phases are typically recorded in the Pn coda portion, which may cause overestimation of Pn body-wave magnitudes for regional events.


ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 100
Serial Issue: 3
Title: Evidence for strong ground motion by waves refracted from the Conrad discontinuity
Affiliation: Yonsei University, Department of Earth System Sciences, Seoul, South Korea
Pages: 1370-1374
Published: 201006
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 17
Accession Number: 2010-059098
Categories: Environmental geologySeismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
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: 201032
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