碩士 / 國立中央大學 / 地球科學學系 / 101 / The South China Sea (SCS) is a part of the western Pacific Ocean, bounded by Eurasian Plate in the west and Indo-Australian Plate and Pacific Plate in the east. In the past, several surveys with multi-channel seismic were investigated in SCS. But the seismic data are limited by some specific points or profiles. And then, Gravity study provides useful geophysical information in the shallow depths and large regional area. It’s can be helpful to investigate the analysis.
In this study, the gravity data is used marine and satellite of free-air anomalies, bathymetric model and sediment thickness data from NGDC in South China Sea area. Removing gravity effects generated by the water, sediment layer and seafloor topography, the regional Bouguer gravity anomaly is obtained. Moho depth is computed by the Parker-Oldenburg method from the when regional Bouguer gravity data set. In results, it indicates that the Moho depth beneath in SCS is about 10 km. The characteristic of gravity anomaly and Moho depth indicated the oceanic crust with Isostasy. The Moho depth is 15~24 km in the northwest SCS and Zhongsha Islands. It’s thin continental crust. It suggested that it exist two crust types including the thin continental and oceanic crust in South China Sea area. Moho depth is relatively shallower in spread axis in the central basin and thickens toward both sides of the spread axis.
| Identifer | oai:union.ndltd.org:TW/101NCU05134020 |
| Date | January 2013 |
| Creators | Chia-Chin Ho, 何佳晉 |
| Contributors | Horng-Yuan Yen, Bor-Shouh Huang, 顏宏元, 黃柏壽 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 59 |
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