Crustal structure beneath the southern Korean Peninsula from local earthquakes SCIE SCOPUS

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Title
Crustal structure beneath the southern Korean Peninsula from local earthquakes
Author(s)
Kim, Kwang-Hee; Park, Jung-Ho; Park, Yongcheol; Hao, Tian-Yao; Kim, Han-Joon
KIOST Author(s)
Kim, Han Joon(김한준)
Publication Year
2017-05
Abstract
The 3-D subsurface structure beneath the southern Korean Peninsula is poorly known, even though such information could be key in verifying or rejecting several competing models of the tectonic evolution of East Asia. We constructed a 3-D velocity model of the upper crust beneath the southern Korean Peninsula using 19 935 P-wave arrivals from 747 earthquakes recorded by high-density local seismic networks. Results show significant lateral and vertical variations: velocity increases from northwest to southeast at shallow depths, and significant velocity variations are observed across the South Korea Tectonic Line between the Okcheon Fold Belt and the Youngnam Massif. Collision between the North and South China blocks during the Early Cretaceous might have caused extensive deformation and the observed negative velocity anomalies in the region. The results of the tomographic inversion, combined with the findings of previous studies of Bouguer and isostatic gravity anomalies, indicate the presence of high-density material in the upper and middle crust beneath the Gyeongsang Basin in the southeastern Korean Peninsula. Although our results partially support the indentation tectonic model, it is still premature to discard other tectonic evolution models because our study only covers the southern half of the peninsula.
ISSN
0956-540X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/1245
DOI
10.1093/gji/ggx079
Bibliographic Citation
GEOPHYSICAL JOURNAL INTERNATIONAL, v.209, no.2, pp.969 - 978, 2017
Publisher
OXFORD UNIV PRESS
Subject
WAVE VELOCITY STRUCTURE; 3-DIMENSIONAL P; COLLISION; MODEL; SUBDUCTION; CALIFORNIA; INVERSION; MANTLE; IMAGE; BELT
Keywords
Seismic tomography; Continental neotectonics; Crustal structure; Asia
Type
Article
Language
English
Document Type
Article
Publisher
OXFORD UNIV PRESS
Related Researcher
Research Interests

Marine Geophysics,Marine Active Fault Study,Exploration Seismology,해양지구물리,해저단층연구,탄성파탐사

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