自1982年7月7日至1982年8月20日,用4台大动态范围的数字地震仪在剑川盆地内记录了7月3日16时13分剑川5.4级地震的余震。仔细地对这些余震定位的结果,显示了一个盆地下部向西倾斜的断裂带,定位的结果并与复合震源机制解相一致。这条断层明显地和盆地西部的断层区相联接。与美国西部的山区盆地区域相类似,这个盆地的形成是南北向的挤压与东西向拉张的应力作用的结果。 From July 7, 1982 to August 20, 1982, four large dynamic range digital seismographs were used to record the aftershocks of the Jianchuan MS 5.4 earthquake at 16:13 on July 3 in the Jianchuan Basin. Careful mapping of these aftershocks shows a westward-sloping fault zone in the lower part of the basin, which is consistent with the mechanism underlying the compound focal mechanism. This fault is obviously connected to the fault zone in the western part of the basin. Similar to the mountainous basin area in the western United States, the basin was formed as a result of the north-south extrusion and east-west tensile stresses.