摘要
2013年7月22日岷县漳县Ms6．6地震前2～3月内，武都、天水应变资料出现了不同程度的异常变化，其中两台的NW道异常都非常显著，与2003年、2004年2次岷县地震前武都应变出现的异常很相似，都有β1、β2、γ1三阶段前兆异常特征。
Wudu and Tianshui strain stations have monitored the stress and strain near fractures and tectonic belts in southeastern Gansu since a few decades ago. As an effective observation method of earthquake precursors, it is of extremely vital significance and before many earth- quakes it responded really well. The borehole strain gauge of pressure vessel style used in Wudu and Tianshui is the latest generation of strain gauge. In two or three months before the Minxian --Zhangxian Ms6.6 earthquake, the strain data in Wudu and Tianshui had shown varying degrees of abnormal changes. The NW orientation of two strain gauges appeared extremely obvious a- nomaly, which was similar to that in Wudu before two earthquakes which occurred in Min county in 20003 and 2004. They showed the same characteristics of precursory anomalies in three stages of β1 , β2 and γ1.
出处
《西北地震学报》
CSCD
北大核心
2013年第B12期102-107,共6页
Northwestern Seismological Journal
关键词
岷县
漳县Ms6
6地震
钻孔应变
背景特征
前兆异常
Minxian-- Zhangxian Ms 6.6 earthquake
borehole strain
background characteristics
precursory anomaly
