Rayleigh Wave Group Velocities with an Enhanced Resolution in the Northern Korean Peninsula
(주)코리아스칼라
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- 2016.11.02
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- 2016.09
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서지정보
ㆍ발행기관 : 한국지구과학회
ㆍ수록지정보 : 한국지구과학회지 / 37권 / 5호
ㆍ저자명 : Heeok Jung, Yong-Seok Jang
목차
Introduction
Geology and Tectonic Setting
Data and Method
Determination of Group Velocity
Results and Discussion
Conclusions
References
영어 초록
Using a method suggested by Yanovskaya, we obtained Rayleigh wave group velocities with a resolution of 1.0o ×1.0o in a period range between 10 and 80 s in and around the Korean peninsula. Both regional and distant earthquake data sets were used together in analysis of group velocities. The resolution of the group velocity maps has been remarkably enhanced by the method, especially in the sparse/non-station region in the northern Korean peninsula. Some qualitative geophysical information was inferred from the group velocity maps. In the East Sea, the slow group velocities at periods longer than 40 s suggest the existence of an oceanic lithosphere at depths of 50-70 km, assuming 4 km/s of S wave velocity at a period of 40 s. On the other hand, a thick lithosphere can be inferred in the continental area from the fast group velocities at periods longer than 50 s. For most periods, the group velocities change rapidly over a short distance of about 200 km across the eastern coast of Korean peninsula, which may suggest a rapid change in the thickness of lithosphere in this area.
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