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Basic characteristics of active tectonics of China 总被引:76,自引:8,他引:76
Active tectonics is inferred to all the structures which have been active since the late Pleisto-cene, 100—120 ka B.P., are still active recently, and will be active in a certain time period in the future, such as active faults, active folds, active basi… 相似文献
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祁连山强震构造带分段及其地震危险性评估 总被引:3,自引:1,他引:3
祁连山强震构造带由祁连山北缘断裂和海原断裂组成。断裂带主要表现为压扭性左旋滑动,最大滑动速率达9mm/a。沿带有一系列的古地震事件,且有多次历史地震发生。海原8.6级地震就发生在该带上。根据该带的断裂活动习性,按照一定的原则和依据划分成3个一级断层段和17个二级断层段。建立了古地震、历史大震图像识别和地震重现间隔二元分析的数学模型。在此基础之上对该带作了地震危险性别定,划分出3个A类危险段和4个B类危险段 相似文献
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根据野外调查获得的第一手资料,结合前人有关雾渡河断裂的研究成果,论述了雾渡河断裂的区域地质背景、构造应力场、深部构造特征、地貌水系样式,其中重点解决了雾渡河断裂的运动学特征和断裂活动时代.根据所采断裂上覆第四纪沉积物样品的TL测年数据(76.43±6.49 ka),确定雾渡河断裂晚更新世以来活动不明显. 相似文献
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The Xiannvshan fault zone, lying along the western margin of the Huangling anticline, is one of the most important fault zones in the Three Gorges reservoir area. The fault experienced strong activity during the Cenozoic Era. The question of whether the fault zone goes through the Yangtze River has been one of the key problems faced in previous studies as it has a significant influence upon the assessment of geological hazards and earthquake stability in the reservoir area. Based on tectonic and geomorphic observations along the fault zone between the Baixianchi village in Changyang county and Huangkou village in Zigui town, together with the comparisons between the geology in Guizhou and Quyuan town in the north bank of the Yangtze River and the Xiannvshan fault zone, it is suggested that the north end of this fault zone is located around Huangkou village and does not go through the Yangtze rivers northward. The evidence is as follows: ① On the basis of field data collection, it is found that the Xiannvshan Fault zone, which stretches 80km, underwent thrust movement in the Cenozoic period, resulting in ravines and fault scarps, topographically. Whereas, on the northern bank of the Yangtze River, faults are rarely found, and most of the faults are developed in the Jurassic strata,without topographical effects. Therefore, the Xiannvshan Fault zone has not stretched to the north bank of the Yangtze River. ② The fault gouge and tectonite zone were found developed on the Xiannvshan Fault zone at Baixianchi village, but only a tectonite zone was found at Zhouping village. There are also some branch faults close to the northern end of the fault zone. So, the activity of the fault zone weakened from south to north in Cenozoic. The fault zone extends northward and dies out at Huangkou. It doesn’t stretch forward any longer as indicated by continuous strata, sparse joints, and small folds, etc. 相似文献
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中国大陆主要强震断裂带超长地震活动期的划分和对比 总被引:1,自引:0,他引:1
根据古地震和历史地震研究了强震断裂带-阿尔金带、祁连山带、阿尼玛卿山带、鲜水河带、金沙江-红河带和汾渭带的地震活动。划分了超长地震活动期。 相似文献
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本文论述了活断层分段中的一些基本概念和主要的边界标志。提出分段的基本原则是:以断裂的不连续性为依据,以地震危险性评价为目的,划分断层段。文中提出了9条分段依据和39个具体标志。认为地震危险性评价应坚持两条原则:①由定性到定量;②循序渐进,逐步缩小范围和时段。文中提出了利用活断层资料确定潜在地震危险区、估算震级和预测发展时间的方法,其中的一些模型是作者近年来的最新研究成果。认为利用活断层分段进行地震危险性评价具有一定的科学性和实用性,是中长期地震预测的重要研究内容之一。 相似文献