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High-resolution crustal shear-wave velocity structure in the Pearl River delta, south China

Lu Zuoyong, Huang Haibo, Ye Xiuwei, Lu Jinshui and Xiong Cheng
High-resolution crustal shear-wave velocity structure in the Pearl River delta, south China
Seismological Research Letters (September 2021) 93 (1): 338-350

Abstract

We present a high-resolution shear-wave velocity model of the upper-middle crust beneath the Pearl River Delta. The sedimentary basins are characterized by low-velocity anomalies at depths of 6-8 km and reflect the lateral migration of the deposition centers. High-velocity structures are located predominantly in Hong Kong, and outline the supervolcano conduit and magma reservoir in the crust. We observe contrasting velocity structures across the Lianhuashan fault zone (LFZ) where low-velocity anomaly zones (LVZs) are developed in different strikes. Microseismic swarms at depths of 8-16 km mainly occurred at the intersection of the LVZs. Metamorphic fluids and migration in the crust are proposed to interpret the seismic activity. The intersecting LVZs would increase the lithologic permeability to allow deep-rooted fluids to flow up, whereas the overlying high-velocity structures representing the overflowing magma act as a permeable barrier that confines the seismicity in the middle-lower crust. We anticipate that the detailed subsurface structures will help correlate magmatic remnants with the distribution of intraplate earthquakes and assess the earthquake risks in the Greater Bay Area of China.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 93
Serial Issue: 1
Title: High-resolution crustal shear-wave velocity structure in the Pearl River delta, south China
Affiliation: China Earthquake Administration, Guangdong Earthquake Agency, Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Guangzhou, China
Pages: 338-350
Published: 20210915
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 70
Accession Number: 2021-063174
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps, sects.
N21°40'00" - N23°40'00", E112°00'00" - E115°00'00"
Secondary Affiliation: South Marine Science and Engineering Guangdong Laboratory, CHN, China
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: 202144
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