Premium
Surface‐wave tomography from ambient seismic noise of accelerograph networks in southern Korea
Author(s) -
Kang TaeSeob,
Shin Jin Soo
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl027044
Subject(s) - geology , outcrop , seismology , ambient noise level , rayleigh wave , basement , volcano , surface wave , structural basin , noise (video) , seismic noise , tomography , geomorphology , sound (geography) , image (mathematics) , telecommunications , physics , optics , artificial intelligence , computer science , civil engineering , engineering
An efficient and robust cross‐correlation technique for estimation of surface wave Green's function between two locations is applied to a set of ambient noise data recorded by accelerograph networks in the southern Korea. We have estimated 1843 group velocities of Rayleigh waves in the period band of 2–4 seconds from correlation pairs of 91 accelerograph stations. Relatively dense and uniform coverage of the pairs provides us with high‐resolution tomographic image of surface‐wave group velocities in the region. The resulting group‐velocity distribution correlates well with the characteristic features of geological map of the region, displaying low velocities for the sedimentary basins and regions of volcanic and metasedimentary rocks, and high velocities for the regions where granitoid basement rocks outcrop. The short‐period information from the accelerograph network can enhance resolution of the subsurface structures at depths within a few kilometers, which may be predominantly responsible for simulation results of strong ground motions.