苏北—滨海断裂北段最新活动时代研究

朱孟浩; 闵伟; 刘金瑞; 任治坤; 冯英辞

doi:10.11899/zzfy20210104

苏北—滨海断裂北段最新活动时代研究

doi: 10.11899/zzfy20210104

朱孟浩^1,,
闵伟^1, ,,
刘金瑞¹,
任治坤¹,
冯英辞^{2, 3}

1.
中国地震局地震与火山灾害重点实验室，中国地震局地质研究所，北京 100029
2.
中国科学院边缘海与大洋地质重点实验室，南海海洋研究所，广州 510301
3.
中国科学院南海生态环境工程创新研究院，广州 510301

基金项目: 国家重点研发计划（2017YFC1500401）

详细信息

作者简介:
朱孟浩，男，生于1997年。硕士研究生。主要从事构造地貌与活动构造方向的研究。E-mail：zhumh19@163.com

通讯作者:
闵伟，男，生于1964年。研究员。主要从事活动构造与工程区划方面的研究。E-mail：dzs_min@163.com

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出版历程
- 收稿日期: 2020-12-18
- 网络出版日期: 2021-07-12
- 刊出日期: 2021-03-31

Characteristics and Activity of the Northern Segment of the Littoral Fault Zone at Northern Jiansu Region

Zhu Menghao^1
,,
Min Wei^{1
, ,},
Liu Jinrui¹,
Ren Zhikun¹,
Feng Yingci^{2, 3}

1.
Key Laboratory of Seismic and Volcanic Hazards, Institute of Geology, China Earthquake Administration, Beijing 100029, China
2.
Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
3.
Innovation Academy of South China Sea Ecology and Environmental Engineering, Guangzhou 510301, China

摘要

摘要:
苏北—滨海断裂在江苏以北的存在与活动性长期以来存在争议。本研究通过小多道地震探测技术，对苏北—滨海断裂北段及附近海域进行探测，识别出4个反射界面，将研究区第四纪地层划分为4个地震层序，分别对应全新世、晚更新世、中更新世和早更新世4个地质时期。对照区域地质构造，对地震剖面断点进行分析，认为断点F1、F2、F3、F4、F8、F9、F10对应为苏北—滨海断裂，断裂错动的最新地层为晚更新世，因此推断苏北—滨海断裂为晚更新世活动断裂。
- 小多道地震 /
- 苏北—滨海断裂 /
- 断裂活动性
Abstract:
The activity of the northern segment of littoral fault zone at northern Jiangsu is still unclear and in debate. In this study, we carried out small mini-multichannel seismic survey across the northern segment of the littoral fault zone and around the adjacent sea area. There are four reflection interfaces were identified from the seismic reflection profiles. The Quaternary stratigraphy in the study area was divided into four seismic sequences corresponding to four geological periods, as Holocene, Late Pleistocene, Middle Pleistocene and Early Pleistocene. According to the regional geological structure, the fracture points F1, F2, F3, F4 and F8, F9 and F10 correspond to the northern littoral fault zone in the study are, and the latest strata of fault movements are in the Late Pleistocene. Therefore, it can be inferred that the northern segment of the littoral fault zone is of Late Pleistocene activity at Northern Jiangsu region.
- Mini-multichannel seismic survey /
- Littoral fault zone /
- Fault activity

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图 1 江苏—南黄海地区地震构造

Figure 1. The main faults distribution in Jiangsu—South Yellow Sea region

下载: 全尺寸图片幻灯片

图 2 苏北—滨海断裂及邻区构造简图

Figure 2. Simplified geological map of the littoral fault zone and its adjacent region

下载: 全尺寸图片幻灯片

图 3 钻孔QC2柱状图与测线YC5剖面对照

Figure 3. Comparison of core QC2 and the profile of YC5

下载: 全尺寸图片幻灯片

图 4 YC5测线断裂解释

Figure 4. Interpretation of the profile of YC5

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图 5 YC2测线断裂解释

Figure 5. Interpretation of the profile of YC2

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图 6 YC5地震成像剖面及解释（局部）

Figure 6. Part of the profile of YC5 and its interpretation

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图 7 YC2地震成像剖面及解释（局部）

Figure 7. Part of the profile of YC2 and its interpretation

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表 1 地层单元地质时代划分

Table 1. Seismic unit age and era division table

地层时代	地层单元	年龄范围/（ka BP）
全新世	U1	13～0
晚更新世	U2	128～13
中更新世	U3	700～128
早更新世	U4	>750

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表 2 剖面识别断点

Table 2. List of profile recognition breakpoints

推测断裂	序号	所在测线	断点编号	纬度	经度	视倾角/(°)	上断点深度/m
苏北—滨海断裂	1	YC2	F8	33°39′17.283″N	120°58′13.413″E	42.50	96.2
	2	YC2	F9	33°38′46.832″N	120°57′0.061″E	44.87	73.6
	3	YC2	F10	33°38′37.990″N	120°56′34.094″E	43.84	98.4
	4	YC5	F4	33°48′31.201″N	120°47′6.311″E	37.20	91.1
	5	YC5	F3	33°50′57.200″N	120°47′53.492″E	46.54	52.1
	6	YC5	F2	33°51′15.778″N	120°47′59.501″E	45.80	48.6
	7	YC5	F1	33°53′05.222″N	120°48′34.727″E	36.30	92.7
盐城—南洋岸断裂	8	YC5	F7	33°41′34.151″N	120°44′45.578″E	39.45	92.4
	9	YC5	F6	33°42′45.906″N	120°45′14.179″E	58.31	66.7
	10	YC5	F5	33°43′30.144″N	120°45′29.170″E	49.26	72.5

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