大青山山前活动断裂带分段与潜在震源区划分  

ACTIVE FAULT SEGMENTATION AND THE IDENTIFICATION OF POTENTIAL SEISMIC ZONES ALONG THE DAQINGSHAN PIEDMONT FAULT

作　　者：何仲太[1] 马保起[1] 卢海峰[1] 

机构地区：[1]中国地震局地壳应力研究所,北京100085

出　　处：《地震地质》2007年第4期765-775,共11页Seismology and Geology

基　　金：国家自然科学基金(40371017);国家发展与改革委员会发改投资"城市活断层试验探测"项目(20041138)共同资助

摘　　要：潜在震源区的划分主要包括潜在震源区范围的划定以及震级上限的确定,目前遵循地震构造类比和地震活动重复等原则。而活断层的分段特性也是潜在震源区划分时必须考虑的一个重要因素。大青山山前断裂带至今有3种不同的分段方案,文中比较分析了前人对大青山山前断裂带的分段,并在此基础上对大青山及山前盆地的潜在震源区作了新的划分。鄂尔多斯块体周缘被拉张性断陷盆地围绕,这些断裂系地震构造相似,且除呼包盆地外均有历史8级以上地震记录。文中将大青山山前断裂带与鄂尔多斯块体周缘断裂系进行了构造对比,特别是与华山山前断裂进行了断裂活动性定量对比,得出雪海沟到土左旗段的震级上限为8级,断裂两端潜源震级上限均为7.5级。Identification of potential seismic zone follows the earthquake structure analogy and seismic activity repetition principles at present. Active fault segmentation is an important aspect and should be considered when identifying potential seismic zones. There are three different segmentation plans along Daqingshan piedmont fault,Inner Mongolia. This article compares and analyses the segmentations and then gets a new potential seismic zone identification plan along Daqingshan piedmont fault. Identification of potential seismic zone includes the range subdivision and the estimation on the maximum earthquake magnitude of potential seismic zones. This article sub-divides the ranges of potential seismic zones according to active fault segmentation plan along the Daqinshan piedmont fault proposed by Ran Yong-kang. Ordos Massif is surrounded by depression zones which have similar earthquake structures and historical earthquake records with magnitude over 8 expect the Hu-Bao depression zone. So, this paper compares Daqingshan piedmont fault with other depression zones around Ordos Massif, especially the Huashan piedmont fault,and gets the conclusion of the maximum earthquake magnitude of Daqingshan potential seismic zones.

关 键 词：大青山 山前活动断裂 分段 潜在震源区划分 

分 类 号：P315.2[天文地球—地震学]