2014 年2 月12 日于田MS 7. 3地震前形变异常

Deformation anomalies before the Yutian earthquake with MS7. 3 on February 12，2014

摘要:

介绍了2014 年2 月12 日新疆于田MS7. 3 地震周围区域前兆监测能力及震前和田台金属摆存在的趋势性异常和中短期异常，并与2008 年3 月21 日于田MS7. 3 地震前兆异常进行对比分析。研究结果表明，本次地震前趋势性异常表现为2012 年以后金属摆倾斜趋势性东倾变化，中短期异常表现为两分量的速率变化加速、停滞，矢量方向和模长突变的特征;2 次7 级地震前和田台金属摆倾斜趋势性异常相同，都发生在趋势性东倾阶段，而中短期异常在持续时间、异常特征和发震间隔等方面存在显著不同。

Abstract:

The Yutian earthquake with MS7. 3 happened on February 12，2014． The precursor monitoring ability was weak in the area． We found tendency anomalies and med- and short-term anomalies of metal pendulum in Hotan before earthquake． And we also compared anomalies with those of the Yutian earthquake with MS7. 3 on March 21，2008． The tendency anomalies of metal pendulum appeared since 2012 with east direction while med- and short-term anomalies showed acceleration，pulse and rapid change with two directions． The tendency anomalies of metal pendulum were the same before the two earthquakes． There both happened in the east direction． But the differences are time of duration，characteristic and earthquake interval of the med- and short-term anomalies．