鲁西地区苍山-尼山断裂活动习性及地震活动研究
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摘要
在广泛搜集以往研究资料的基础上,运用野外地震地质考察、典型地质剖面和探槽剖面分析、系统取样等方法,研究了苍山-尼山断裂的活动性质、最新活动时代和古地震事件。研究表明:苍山-尼山断裂以左旋走滑运动为主兼有逆冲运动分量;其第四纪晚期以来的活动具有分段性,以甘霖为界,北西段为晚更新世晚期至全新世早期,南东段为晚更新世晚期;有确凿证据的古地震事件有2次,其发生时间分别是距今6.4万年左右(E1)和距今1.4万年左右(E2);另据考证,公元前179年"齐楚地震"也发生在该断裂上。根据历史地震和现代地震的研究成果,分析认为该断裂未来具有发生6.5级左右地震的潜在危险。
Based on geological data on Cangshan-Nishan fault,using field seismogeology investigation,typical geological section and coastean section analysis,this paper studies the activity characteristic,latest activity and paleo-earthquake of the Cangshan-Nishan fault.The study shows that,the Cangshan-Nishan fault is a left-strike-slip thrust fault,the activity of which shows sectional feature since late period of Quaternary.With Ganlin as a boundary,the fault can be divided into two subsections,its north-west subsection is from late period of Pleistocene to early period of Holocene,while its south-east subsection is late period of late Pleistocene;there are two paleo-earthquakes occurred on the fault about E6.4 ten thousand years(E1) and 1.4 ten thousand years(E2);according to textual research,the 179BC "Qi-Chu earthquake" also occurred on this fault.According to research result of historical seismic activity and modern seismic activity,the fault is at risk of an earthquake of magnitude about 6.5 in the future.
引文
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