红柳峡跨断层水准规律性变化分析

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英文篇名：Analysis of regularity change of cross-fault level in Hongliuxia 作者：岳冲 ; 闫伟 ; 杨文 ; 宋治平 英文作者：Yue Chong;Yan Wei;Yang Wen;Song Zhiping;Key Laboratory of Earthquake Dynamics, Institute of Geology,China Earthquake Administration;China Earthquake Networks Center; 关键词：红柳峡 ; 跨断层水准 ; 地震活动 ; 条带分布 英文关键词：Hongliuxia;;cross fault leveling;;seismic activity;;belt distribution 中文刊名：DZGJ 英文刊名：Seismological and Geomagnetic Observation and Research 机构：中国地震局地质研究所地震动力学国家重点实验室;中国地震台网中心; 出版日期：2019-04-25 出版单位：地震地磁观测与研究 年：2019 期：v.40;No.240 基金：国家重点研发计划(项目编号:2018YFC0807000);; 中国地震台网中心青年科技基金(项目编号:QNJJ201801);; 2019年度震情跟踪定向工作任务(项目编号:2019010223) 语种：中文; 页：DZGJ201902011 页数：8 CN：02 ISSN：11-2327/P 分类号：88-95

摘要

红柳峡跨断层水准多次出现由张性背景转为大幅压缩的规律性变化,基于青藏高原地区5级以上地震高频时空分布特征,与祁连山断裂带异常跨断层场地同步性进行对比,结果显示:(1)红柳峡跨断层水准与祁连山断裂带上其他跨断层异常场地变化时间一致性较好;(2)在红柳峡水准出现压性变化的1年内,青藏高原5级以上地震高频活动多发,且红柳峡水准出现压缩变化时段内,在青藏高原内部多形成NE向5级以上地震条带,表明应力多沿NE向集中。研究结果表明,印度洋板块在北向推挤增强过程中,引发青藏高原内部及周边块体一系列地震,而作为祁连山断裂带西端特殊的跨断层场地,红柳峡跨断层存在块体调整过程中出现较为规律异常变化的可能。
        The cross-fault level of Hongliuxia has changed from a tension to a large-scale compression. By comparing synchronicity of the anomalous cross-fault sites on Qilian mountain fault zone and the spatial and temporal distribution characteristics of the high frequency of earthquakes above magnitude 5 in the Qinghai-Tibet Plateau, the result shows that the changes of Hongliuxia cross-fault leveling have a good time consistency with other abnormal cross-fault sites in Qilian mountain fault zone. The high frequency activities of earthquakes above magnitude 5 in the Qinghai-Tibet Plateau mostly occurred within one year after the compression change of Hongliuxia. In the compression change period of Hongliuxia cross-fault leveling, North-East direction seismic belt is formed in the inner area of the Qinghai-Tibet Plateau. It indicates that the stress is concentrated along this direction, which causes the adjustment motion of the fault with the change of stress. It indicates that during the northward compression of the whole India ocean plate, a series of adjustments were made to the Qinghai-Tibet Plateau and its surrounding blocks. As a special fault at the west end of the Hongliuxia fault zone, it is possible that there will be some regular abnormal changes during the block adjustment.

引文

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