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Seismic hazard assessment of the mid-northern segment of Xiaojiang fault zone in southwestern China using scenario earthquakes

Liu Jingwei, Zhang Lifang and Du Yi
Seismic hazard assessment of the mid-northern segment of Xiaojiang fault zone in southwestern China using scenario earthquakes
Bulletin of the Seismological Society of America (March 2020) 110 (3): 1191-1210

Abstract

Seismic hazards in the vicinity of the mid-northern segment of the Xiaojiang fault zone were estimated from scenario earthquakes. Based on its history of earthquakes and activity data, the whole segment is considered capable of generating large earthquakes. The characteristics of previous ruptures and the geometric structures of the fault were used to establish seven scenario earthquakes with various strike and length properties. On the basis of focal mechanism parameters and the distribution of previous earthquakes, we determined the values of the source parameters for each scenario using empirical equations. We then used a stochastic finite-fault model to generate the ground motion from the targeted fault. The results show that the vicinity of the mid-northern segment of the Xiaojiang fault zone faces significant seismic hazards. The peak ground acceleration (PGA) values along the fault line are obviously larger than in other areas. Based on the recurrence interval theory, the Qiaojia-Menggu and Xiaoxinjie-Xujiadu areas have a high probability of being struck by large earthquakes in the near future. The results also show that the current design PGA for the near-fault area of the mid-northern segment of Xiaojiang fault zone might not be adequate.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 110
Serial Issue: 3
Title: Seismic hazard assessment of the mid-northern segment of Xiaojiang fault zone in southwestern China using scenario earthquakes
Affiliation: China Earthquake Administration, Institute of Crustal Dynamics, Beijing, China
Pages: 1191-1210
Published: 20200317
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 96
Accession Number: 2020-039339
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables, sketch maps
N25°00'00" - N27°00'00", E103°00'00" - E103°19'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202025
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