第5章活断层地震130428

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1、 The Landers fault (red lines at left) and the Hector Mine fault and its aftershocks (red lines and circles at right). The Hector Mine earthquake was a magnitude 7.1, and it produced thousands of aftershocks. (Image courtesy of Egill Hauksson, Caltech)San Andreas Fault Through Carrizo PlainThe San A

2、ndreas fault cuts spectacularly across the Carrizo Plain of California in this view looking to the northwest toward Soda Lake (white salt flat visible on the horizon). Streams draining off the Temblor Range to the east (lower right of picture) are offset to the north by right-lateral strike-slip fau

3、lt motion along the San Andreas. The San Andreas marks the boundary between the Pacific Plate to the west and the North American Plate to the east, and is among the most active fault systems in the world. Geologists believe that the total accumulated displacement from earthquakes and creep is at lea

4、st 550 kilometers along the San Andreas fault since it came into being about 15-20 million years ago. In detail, the fault is a complex zone of crushed and broken rock from a few hundred meters to several kilometers wide. Many smaller faults branch from and join the San Andreas fault zone. 图中充当标尺的小伙

5、是UC Davis地质系大地构造专业研究生Peter Gold，何鹏摄于2009年4月26日 研究研究 意义意义它的活动会直接损害跨断层修建或与断层邻近的建筑物它的活动会直接损害跨断层修建或与断层邻近的建筑物伴生地震使大范围内建筑物受损伴生地震使大范围内建筑物受损 绵竹5.12地震中毁坏的公路桥何鹏摄于2008年8月 活断层区规划设计建筑物的原则活断层区规划设计建筑物的原则 规划规划 选场选场有低级别的活动断层的场地优于有高级别的的场地有低级别的活动断层的场地优于有高级别的的场地;尽可能避开主断层带尽可能避开主断层带;尽可能避开正、逆断层的上盘（此处地表变形强烈，分尽可能避开正、逆断层的上盘（