The gravity and isostatic Moho in North China Craton and their implications to seismicity
Yangfan Deng1,2, Weiming Fan1, Zhongjie Zhang2, Kai Liang3
1 Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2 State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 3 China University of Petroleum (Hua Dong), Qingdao 266580, China
The gravity and isostatic Moho in North China Craton and their implications to seismicity
Yangfan Deng1,2, Weiming Fan1, Zhongjie Zhang2, Kai Liang3
1 Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2 State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 3 China University of Petroleum (Hua Dong), Qingdao 266580, China
摘要The Bouguer gravity is the combination of field sources in different depths. Based on the multi-scale analysis of the Bouguer gravity, we can get the gravity anomaly caused by the Moho undulation. This study presents the various orders of approximation of gravity anomaly in North China Craton (NCC), the possible source depths with radial logarithmic power spectrum, and the relationship between the deep structure and gravity anomaly. Furthermore, we discuss the isostatic compensation about the Moho depth from gravity and deep seismic sounding profiles (DSS). The results show that: (1) the fourth approximation could have resulted from the Moho undulation, (2) in contrast to the isostatic Moho, the inverted gravity Moho and the DSS Moho show that most of NCC has been isostatically compensated, and (3) the isostatic compensation rate has some close relation to the seismicity.
Abstract：The Bouguer gravity is the combination of field sources in different depths. Based on the multi-scale analysis of the Bouguer gravity, we can get the gravity anomaly caused by the Moho undulation. This study presents the various orders of approximation of gravity anomaly in North China Craton (NCC), the possible source depths with radial logarithmic power spectrum, and the relationship between the deep structure and gravity anomaly. Furthermore, we discuss the isostatic compensation about the Moho depth from gravity and deep seismic sounding profiles (DSS). The results show that: (1) the fourth approximation could have resulted from the Moho undulation, (2) in contrast to the isostatic Moho, the inverted gravity Moho and the DSS Moho show that most of NCC has been isostatically compensated, and (3) the isostatic compensation rate has some close relation to the seismicity.
基金资助:the National Nature Science Foundation of China (41021063, 41004017)
通讯作者:
Yangfan Deng
E-mail: dengyangfan@mail.iggcas.ac.cn
引用本文:
Yangfan Deng, Weiming Fan, Zhongjie Zhang, Kai Liang. The gravity and isostatic Moho in North China Craton and their implications to seismicity[J]. 《地震学报》英文版, 2014, 27(2): 197-207.
Yangfan Deng, Weiming Fan, Zhongjie Zhang, Kai Liang. The gravity and isostatic Moho in North China Craton and their implications to seismicity. Earthquake Science, 2014, 27(2): 197-207.
