【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 ,才能确定月亮山东麓断裂是一个独立的破裂单元还是其他段落破裂的影响段更多还原

【Abstract】 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.更多还原