Temporal and Spatial Features of Isostasy Anomaly Using Gravitational Admittance Model at Eastern Margin of Tibetan Plateau

详细信息   

• 责任者：Chen Shi (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Wang Qianshen
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(1)
• 关键词：重力异常 ; gravity anomaly ; 龙门山断裂带 ; Longmenshan Fault Zone
• 页码：p.22-34
• 图表：9 illus., 34 refs.
• 分类号：0400
• 出版序号：20120055
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

Eastern margin of Tibetan plateau belongs to north-south seismic belt.  In this paper, the authors used the gravitational admittance theory and method to compute the background isostasy anomaly of gravitational admittance model in this region. Through comparing the isostasy anomaly characteristics of Airy model and elastic plate model and analyzing the regional seismic activity, the authors evaluated the results and optimized the parameter used for calculation. Based on this, the authors finished the comparison and analysis of isostasy anomaly response characteristics along three profiles across the eastern margin of Tibetan Plateau, and taking this isostasy anomaly background as the reference field, further explained the temporal and spatial features of mobile gravity measurement dataset of 1998～2005.