摘要
通过对发生在甘东南地区三次中强地震前4个前兆学科以及测震学指标的研究,发现各学科前兆异常在时空上表现出很好的协调性特征.主要表现在:各学科异常持续时间均较短;各异常以中短期为主,有一定中期异常,临震异常不明显;从震前1年到短临阶段异常显示出向震中迁移的迹象;各异常点集中分布在低b值异常区.讨论了前兆协调性与地下流体和深部热物质的运移的关系.
Based on study of some precursors before 3 moderate strong earthquakes in southeast part of Gansu provice,it is found that all kinds of precursors show harmonious character in temporalspatial.The result shows that the anomalies last shorter time and mainly in middleshort term,but in impending term is not clear.From one year to shortimpending stage,the anomalies migrate to earthquake epicenter.The distribution of precursor anomalies and low b value are concentrated to same area.The relationship between the harmonious character of precursors and transportation of underground fluid and thermal material in deep crustal is discussed.
引文
① 尹京苑 ,等 .强震震源孕育过程中短期阶段物理力学机制的理论研究 . 2 0 0 0 .
[1] 曹玲玲,刘耀炜.西北地下流体观测网综合评价[J].西北地震学报,1999,21(1):62—66.
[2] 张肇诚主编.中国震例(1986-1988)[M],北京:地震出版社,1999.
[3] 刘耀炜,范世宏,曹玲玲.地下流体中短期异常与地震活动性指标[J].地震,1999,19(1):19—25.