Preliminary analyses of the characteristics of Moho undulation and crustal thinning in East China Sea

ZHOU Zhi-yuan; GAO Jin-yao; WU Zhao-cai; SHEN Zhong-yan; ZHANG Tao; SUN Yun-fan

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Journal of Marine Sciences ›› 2013, Vol. 31 ›› Issue (1) : 16-25.

Preliminary analyses of the characteristics of Moho undulation and crustal thinning in East China Sea

ZHOU Zhi-yuan, GAO Jin-yao, WU Zhao-cai, SHEN Zhong-yan, ZHANG Tao, SUN Yun-fan

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Abstract

Numerous sedimentary thickness data provided by seismic profiles were collected and drawn into the sedmimentary isopach in the East China Sea. The residual gravity anomalies were obtained by subtracting the gravity effect generated by the sediments from the complete Bouguer gravity anomalies. Depths to the Moho of the East China Sea were inversed from the residual gravity anomalies with constraint of the seismic penetration depths to the Moho. Our results show that depths to the Moho change between 25 km and 28 km gently and crustal thicknesses change between 14 km and 26 km on the East China Sea Shelf, depths to the Moho change between 16 km and 26 km and crustal thicknesses change between 12 km and 22 km within the Okinawa Trough. Crusts at the east of the East China Sea Shelf Basin and the south of Okinawa Trough are thinned evidently, and their crustal stretching factors are up to 2.6 and 3, respectively. Preliminary analyses suggest that the crust of Okinawa Trough is mainly transition type and there is no obvious evidence to prove the existence of oceanic crust.

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sedimentary thickness / depth to the Moho / crustal thinning / East China Sea

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ZHOU Zhi-yuan, GAO Jin-yao, WU Zhao-cai, SHEN Zhong-yan, ZHANG Tao, SUN Yun-fan. Preliminary analyses of the characteristics of Moho undulation and crustal thinning in East China Sea[J]. Journal of Marine Sciences. 2013, 31(1): 16-25

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