Study on the transverse structures across Taiwan Strait |
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Authors: | Zongjin Ma Chien-Ying Wang Jie Xu Fengjun Nie and Jin Zhang |
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Institution: | 1. Institute of Geology, China Seismological Bureau, Beijing 100029, China 2. Institute of Geophysics, National Central University, Taibei 32054, China |
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Abstract: | The mountain ranges are almost NE- or NNE-trending in mainland and Taiwan island across the strait. But a number of correspondent
transverse structures across Taiwan Strait have been identified on the basis of morphology, surface structure, deep seismic
survey and gravity field etc. Moreover, it is inferred from the square or/and rectangular shape of the isoseist maps of 8
M≥ 6 earthquakes occurring in the western foothill plain of Taiwan that there is an apparent segmentation of the Taiwan Island
along the N-S orientation. This has been verified from the GPS’s results of the ground motions measured during the Chi-Chi
earthquake in 1999. As a matter of fact, the transverse structures within the Taiwan Island could be correlated with more
salient NW- and EW-trending structures in the mainland of Fujian than in Taiwan. The investigation of the transverse structures
across Taiwan Strait is conducive to realizing the geology within the strait. Hence, the tectonic sketch map of the strait
as well as mainland and island drawn in this context shows NW- and EW-trending structures for the study area. |
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Keywords: | Taiwan Strait transverse structure Chi-Chi earthquake GPS |
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