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2004年12月26日印度尼西亚苏门答腊西北海域发生40年来最强烈的地震,造成巨大伤亡和财产损失。大地震在4000km外的柴达木盆地西部地区狮子沟地震台阵网上有长达1000多秒的明显记录,也触发柴西地区地方震的发震频率在大地震之后一天内提高了10倍。从大地震触发的地方震活动分布来看,触发地震的发震断裂是英雄岭南侧花土沟断裂和红柳泉断裂。
December 26, 2004 Indonesia’s most violent earthquake in the northwest of Sumatra took place in 40 years, causing huge casualties and property damage. The obvious record of more than 1000 seconds recorded by the Shizigou seismic network in the western part of the Qaidam basin at a distance of 4,000 km also triggered the occurrence frequency of the local earthquakes in the western Qaidam to increase by 10 times within one day after the earthquake. Seen from the distribution of local earthquake-triggered earthquakes, the seismogenic fault triggering the earthquake is the Huatuogou fault and the Hongliuquan fault on the south side of the heroic ridge.