【摘要】 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.更多还原

【Abstract】 We use the Double-Difference(DD) method to relocate 47 earthquakes from Loma Prieta,California.The events chosen in this study have previously been well identified as members of three multiplets,each made up of a cluster of nearly identical microearthquakes(magnitudes from 0.9 to 2.0).Prior to the relocation,each of these overlapping clusters each had a radius measuring 200m or larger.The relocation reduces the cluster radii by approximately an order of magnitude,resulting in three well-separated micro-clusters.The estimated relative epicentral error of the relocated events is 8.5 m while the corresponding depth error is 23.4 m.更多还原