月亮山东麓断裂古地震活动的初步研究  

A PRELIMINARY STUDY ON PALAEOEARTHQUAKES OF YUELIANGSHAN FAULTS

作　　者：闵伟[1] 张淑萍[1] 

机构地区：[1]中国地震局地质研究所,北京100029

出　　处：《西北地震学报》2001年第1期36-40,共5页Northwestern Seismological Journal

基　　金：地震科学联合基金资助项目!(95 0 742 1);国家重点基础研究发展规划项目!(95 13 0 1 0 4)

摘　　要：月亮山东麓断裂位于海原断裂带的东段 .1 92 0年海原大地震时该段断裂也发生了破裂 .对该段断裂的古地震活动特征的初步研究表明 ,全新世以来 ,月亮山东麓断裂可能发生过 5次破裂事件 ,主要分布在全新世的早期和末期 .海原断裂带具有分段破裂的特征 ,因此需要对照整个断裂带的古地震活动特征 。Yueliangshan fault is the east segment of Haiyuan fault zone.The fault had ruptured during the Haiyuan M S8.5 earthquake in 1920.The recurrence behavior of palaeoearthquakes haven't been studied on the Yueliangshan fault.The preliminary study shows that there may be five palaeoearthquakes to occur on the fault at the early and late Holocene.The Haiyuan fault zone has the property of grade rupture. After studying the palaeoearthquake recurrence behavior of the whole fault zone, it is possible to determine whether the Yueliangshan fault is an independent rupture segment or a secondary segment influenced by other rupture segment.

关 键 词：宁夏 海原断裂带 古地震 月亮山断裂 

分 类 号：P315.2[天文地球—地震学]