中国的地震重复事件

• 作 者: David P.Schaff Pau G.Richards 郑月军
• 机 构: 美国哥伦比亚大学Lamont-Doherty地球观测中心,美国哥伦比亚大学地球与环境科学系,
• 出 处: 地壳构造与地壳应力
• 发表日期: 2010年01期
• 关键词: 双震 定位精度 邻近地区 震中定位 震源深度 波形数据 震源机制 走时差 定位误差 震相

从1985到2000年,在中国及其邻近地区大约10%的地震是重复事件,彼此相距不超过1km。我们对14000个地震和爆破事件做了互相关研究,能达到的测量相对到时精度为0.01s,侧向定位精度为100～300m。这样的精度对地震灾害研究、地震物理及禁止核试验的检验是非常重要的。用大量存储数据中重复信号的重新识别和改进定位的结果,可以对现在拾取到时和地震定位程序的不精确性给出定量描述。

From 1985 to 2000, about 10% of the earthquakes in China and its neighboring regions were repetitive events within 1km of each other. We conducted a cross-correlation study of 14,000 earthquakes and explosions with an accuracy of 0.01 s relative to the measurement and a lateral positioning accuracy of 100 to 300 m. Such accuracy is very important for the study of earthquake disasters, seismic physics and the banning of nuclear tests. With the re-identification of repetitive signals in a large number of stored data and the improved positioning results, a quantitative description of the inaccuracies of present pick-up and seismic location procedures can now be given.