Study on Characteristics of Long-Time Trend Change of Subsurface Fluid before Strong Earthquake in North China and Its Mechanism
详细信息
- 责任者：Lu Mingyong (China Center for Earthquake Disaster Emergency and SAR ; Beijing 100049 ; China) ; Fan Xuefang
- 刊名：Northwestern Seismological Journal
- 出版年：2010
- 卷期：32(2)
- 关键词：地下流体 ; underground fluids ; 强震 ; strong earthquakes ; 华北平原 ; North China Plain
- 页码：p.129-138
- 图表：5 illus., 4 tables, 24 refs.
- 分类号：0500
- issnNo：ISSN1000-0844
- isbnNo：CN62-1048/P
摘要
The long-time trend change shape and evolutionary characteristics of subsurface fluid in North China before Ms≥6.0 earthquakes since 1976 are analysed. The results show that the begin time of long-time trend change of subsurface fluid is earlier, and the range is wider, with the characteristics of compatibility, repetition and migration etc. The migrate direction along major tectonic belt is from wide outer regions to epicenter area, or from epicenter area to wide outer region. The shape of changes show trend turn change, damage annual variation and accelerating variation etc, among them the trend turn change is majority shape. Study on level of underground water shows that the majority variation shapes of long-time trend change on level of underground water are slow elevation or descending diminution. Then long-time trend change of subsurface fluid and crustal deformation before strong earthquakes are comparatively studied. The results discover that the begin time of crustal deformation is earlier than it of subsurface fluid, the tensor-pressure variation of crustal deformation is more closely related with the level variation of underground water. Finally, the mechanism on long-time trend change of subsurface fluid before strong earthquake is discussed.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |