摘要
在对几次６级以上强震震例资料的整理及不同构造应力场中汞的异常特征分析的基础上，讨论了中国大陆汞的前兆异常分布特征与区域构造特点之间的关系。表明在地震活动过程中，汞的空间异常分布特征不仅与震级、震中距有关，还与区域构造应力场及震源与测点之间的介质环境有关。处于不同应力场及介质环境中的汞量观测点，其震前异常特征有明显差异。华北地区汞异常波及的范围较近，持续时间也较短，西南地区汞异常波及的范围较远，西北地区不仅汞异常波及的范围远，而且异常持续的时间较长。
The paper discusses the relationship between distribution characteristics of precursory mercury anomalies and those of regional tectonics in the mainland of China on the basis of data of earthquakes (M≥6) and mercury anomalies in the different tectonical stress field. It is found that the spatial features of mercury are correlated not only with the magnitude of earthquakes, distance from epicenter to the observational site, but also the stress field and medium between the focus and the observational site. It shows obviously that the different mercury anomalies occurred in different stress fields before the earthquakes. Mercury anomalies found in the Northern China are shorter in the period and smaller in spatial extent, but those found in the Northwestern China are usually farther from the epicenter and last for a longer period, and those found in Southwestern China are generally for a larger felt extent.
出处
《地震》
CSCD
北大核心
1999年第4期352-358,共7页
Earthquake
基金
中国地震局"九五"科研攻关项目
关键词
构造应力场
地震活动
汞异常
地震前兆
Tectonical stress field, Earthquake activity, Mercury anomaly
