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1-D Shear Wave Velocity Structure of Northwestern Part of Korean Peninsula
한반도 북서부의 1차원 전단파 속도구조
Econ. Environ. Geol. 2019 Dec;52(6):555-60
Published online December 31, 2019;  https://doi.org/10.9719/EEG.2019.52.6.555
Copyright © 2019 the Korean society of economic and environmental gelology.

Tae Sung Kim*
김태성*

Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 34132, Republic of Korea
한국지질자원연구원 지진연구센터, 대전광역시 유성구 과학로 124
Received December 18, 2019; Accepted December 23, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
One-dimensional shear wave velocity structure of North Korea is constrained using short (2-sec) to long period (30- sec) Rayleigh waves generated from four seismic events in China. Rayleigh waves are well recorded at the five broadband seismic stations (BRD, SNU, CHNB, YKB, KSA) which are located near to the border between North and South Korea. Group velocities of fundamental-mode Rayleigh waves are estimated with the Multiple Filter Analysis and refined by using the Phase Matched Filter. Average group velocity dispersion curve ranging from 2.9 to 3.2 km/s, is inverted to constrain the shear wave velocity structures. Relatively low group velocity dispersion curves along the path between the events to BRD at period from 4 to 6 seconds may correspond to the sedimentary sequence of the West Korea Bay Basin (WKBB) in the Yellow Sea. The low velocity zone in deep layers (14-20 km) may be related to the deep sedimentary structure in Pyongnam basin. The fast shear wave velocity structure from the surface to the depth of 14 km is consistent with the existence of metamorphic rocks and igneous bodies in Nangrim massif and Pyongnam basin.
Keywords : shear wave velocity structure, Rayleigh wave group velocity dispersion curve, West Korea Bay Basin, Pyongnam basin, Nangrim massif

 

December 2019, 52 (6)