A REVIEW ON QUANTITATIVE STUDIES OF ACTIVE TECTONICS IN EASTERN CHINA SEAS
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摘要:
晚更新世以来的活动构造与现代地质灾害密切相关,目前针对陆域活动构造的定量研究成果卓著,而在海域方面研究薄弱。本文综述了国内外有关海域活动构造的研究进展,提出了目前国内海域活动构造定量研究存在的主要问题。在研究实践的基础上,阐述了海域活动构造的主要研究方法、其定量研究的关键问题及解决方案,重点总结了海域活动构造区地震危险性定量评价的研究方案,并进一步探讨了海域活动构造自身因素的危险性定量评价的研究思路。
Abstract:Many kinds of modern geo-hazards are closely related to the active tectonic movement since Pleistocene.Many quantitative researches have been devoted to the active tectonics on land, but seldom in the sea. This paper presents a review on progresses of the research on marine active tectonics in China and some other countries, in which, we made a review of the main problems encountered recently in quantitative studies of active tectonics in the sea area of China, and discussed the main methods for study of marine active tectonics, as well as the key issues for quantitative research and solutions based on the practice in recent years. Emphasis is put on the research schemes for the quantitative risk assessment on potential earthquake in the tectonically active region. Further, the paper discussed the way of thinking for quantitative risk assessment of marine active tectonics from self-factors of China seas.
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Key words:
- Pleistocene /
- active tectonics /
- quantitative research /
- eastern China seas
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图 1 中国东部海域及周边主要断裂[26]及地震震中
Figure 1.
图 2 渤海海域活动断层典型浅地层剖面[45]
Figure 2.
图 3 渤海海域活动断层典型单道地震剖面[45]
Figure 3.
图 4 渤海BH08孔上部50 m段综合地层划分[46]
Figure 4.
表 1 海域活动构造自身因素危险性定量评价的主要评价指标
Table 1. The main indicators of quantitative risk assessment for marine active tectonics from self-factors in China seas area
评价指标 赋值原则 最新活动时间 由新至老,由大到小的原则 断距 由大至小,由大到小的原则 活动速率 由大至小,由大到小的原则 距活动构造的距离 由近至远,由大到小的原则,借鉴国外陆域活动构造避让距离的研究成果[57],赋值时不但需要分析海域活动构造的自身影响范围,而且需充分考虑海域已经存在的管线、光缆及其他工程设施的分布,对各网格单元科学合理的进行赋值。 ...... ...... -
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