Relation between Gravity Field Feature and Tectonics and Earthquakes in Taiwan and Its Adjacent Seas  

作　　者：Zhang Chijun(张赤军) Fang Jian(方剑) 

机构地区：[1]Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077 Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077

出　　处：《Marine Science Bulletin》2001年第2期63-72,共10页海洋通报（英文版）

基　　金：Supported by NSFC ( No.49874016)

摘　　要：Short wave gravity anomaly is correlated to sea floor topography in the gravity field of ×Taiwan and its adjacent seas. Gravity values of 20010-5ms-2 at Yushang and -×16010-5ms-2 at Liuqiu sea trench are respectively the maximum and minimum gravity values in this area. Bouguer gravity anomaly reflects not only Moho interface undulation, but also fault distribution. The inflexion of gradient belt of Bouguer gravity anomaly is a spot liable to earthquakes . Middle-long wave geoid is the best data to invert crustal thickness. We calculate crustal thickness by using geoid data, and the maximum value is 38km; the minimum value is 12km in Taiwan and its adjacent seas.Short wave gravity anomaly is correlated to sea floor topography in the gravity field of ×Taiwan and its adjacent seas. Gravity values of 20010-5ms-2 at Yushang and -×16010-5ms-2 at Liuqiu sea trench are respectively the maximum and minimum gravity values in this area. Bouguer gravity anomaly reflects not only Moho interface undulation, but also fault distribution. The inflexion of gradient belt of Bouguer gravity anomaly is a spot liable to earthquakes . Middle-long wave geoid is the best data to invert crustal thickness. We calculate crustal thickness by using geoid data, and the maximum value is 38km; the minimum value is 12km in Taiwan and its adjacent seas.

关 键 词：Taiwan  gravity  CRUSTAL Thickness  earthquake activity 

分 类 号：P7[天文地球—海洋科学]