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从1985年到2000年间,中国及其邻近地区大约10％的地震事件属于重复性地震事件,并且彼此间不超过1km。我们对约14 000个地震和爆炸的地震图做互相关,计算了相对到时约0.01s,并使横向定位精度达到了100m～300m。这样的精度对于地震危险性研究、地震物理、禁止核试验的核查都非常重要。通过对已有的资料重复性信号的识别和测量,提高了定位精度,改进了在读取初至到时和定位方面目前程序的不精确性。
From 1985 to 2000, about 10% of the earthquakes in China and its neighboring regions belonged to repetitive earthquakes and did not exceed 1km each other. We cross-map the seismograms of about 14,000 earthquakes and explosions, calculating a relative time of about 0.01s and making lateral positioning accuracy of 100m-300m. Such precision is very important for seismic risk studies, seismic physics, and verification of banned nuclear tests. By identifying and measuring repetitive signals of existing data, the positioning accuracy is improved and the current inaccuracies in reading the first arrival and positioning are improved.