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应用双差定位方法(hypodd)对北美Loma Prieta地区的分属于3个地震丛集的47个地震进行了精确定位.采用交叉谱法精确求取信号的走时差;同时采用人机联做方式在时域调整、修正按自动方式无法准确提取时差的信号,确保每个事件对的走时差精度.重定位后,在几百米的范围内,原来相互重叠的震源位置聚集为三个明显分离的丛集;水平方向的相对位置平均误差为8.5米,震源深度方向的平均误差为23.4 m.
47 hypocritical earthquakes belonging to 3 earthquakes in Loma Prieta, North America were precisely located by using hypodispersion method, and the cross-spectrum method was used to accurately determine the signal travel time difference. At the same time, Adjusting and correcting the signals that can not accurately extract the time difference in an automatic way to ensure the accuracy of the travel time difference of each event pair After the relocation, within a few hundred meters, the originally overlapped focal locations gather into three clearly separated clusters ; The average horizontal position relative error is 8.5 meters, and the average depth error is 23.4 meters.