摘要
近年来祁连山东段平凉华亭地区小震活动水平迅速增高,发生了2005年10月2日的4.2级地震,并造成了一定的人员受伤和财产损失。通过地震时空强分布特征及应力场状态的分析,对这些地震的性质进行了系统判定,讨论了小地震的增强活动与区域应力场之间的关系。结果表明,自2001年以来平凉华亭地区小震的丛集活动属于煤矿开采诱发的地震,震级结构主要由1-2级地震组成,空间上集中在30-40km的范围内,每年的5-8月频次明显偏高。其次,测震台网数字化改造后,区域监测能力的提高也是本区小震频度增高的原因之一。
ha recently years, the small earthquakes have occurred more frequently at Huating, Pingliang area in the eastem segment of the Qilian Mountains, such as 4.2 rnagtitude earthquake in Oct.2 2005, and brought some loss of wealth and people. This article deduced the properties of the small earthquakes systematic determinant and discussed the connection of their regional stress field and increased activities by analyzing the distribution intensity characteristics of space - time and the state of regional stress field. The results concluded that, since 2001 the crowd activities about the small earthquakes in Huating district of Pingliang were the earthquakes which induced by the coal mine, the structure of magnitude was primarily composed of 1 - 2 magtitude and the small earthquakes were densely located 30 - 40km area, occurred more frenquently during May to August. Secondly, after the renovation of digital seismograph network, the enhanced ability of regional monitor is also one of reasons of the high small earthquake frequence.
出处
《高原地震》
2006年第4期9-16,共8页
Plateau Earthquake Research
关键词
煤矿诱发地震
地震活动特征
平凉华亭地区
Mining- induced earthquake
Seismicity fealm-e
Huating district of Pingliang
