【摘要】 玉树7.1级地震前,青海南部—西藏东部大范围区域存在6级、5级及ML4级地震空区,主震前130 min发生了4.7级直接前震。2009年11月以来,青海境内又显现多项较为突出的前兆观测异常。总结认为这些异常应属玉树7.1级地震异常。尤其是多震级档地震空区配套出现,表明该区应力处于逐级闭锁状态,对大震孕育区域有很好的指示意义,可作为今后大震跟踪的重要依据。更多还原

【Abstract】 Before the Yushu MS7.1 earthquake,there were seismic gaps of earthquakes with MS6,5 and 4 respectively in southern Qinghai and eastern Tibet,but an earthquake of M4.7 occurred just 130 minutes before the main shock.There had been many obvious earthquake precursors in Qinghai Province since November 2009.It is concluded that these precursors belong to the anomalies of the Yushu MS7.1 earthquake.Especially,the multi-magnitude seismic gaps showed that the area was progressively locked,suggesting earthquake preparation,so it can be regarded as an important basis in forecasting the place of future large earthquakes.更多还原