中国海南岛北部 1605 年琼山 M7½ 地震的成震结构及其全新世活动史:来自横断面钻探和浅层地震剖面的证据

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Chaoqun Wang, Liyun Jia, Daogong Hu, Shibiao Bai, Zhengwang Hu, Dongxia Sun, Xiaoxiao Yang, Lei Zhang, Xiumin Ma
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引用次数: 0

摘要

1605 年 M7½ 级地震是中国历史上唯一一次造成大规模地面沉降入海的地震,地面沉降总面积超过 100 平方公里。灾害导致 72 个村庄下沉。对于此次地震的震源发震断层,目前还没有明确的认识。在这项工作中,我们通过地貌调查、资料收集、浅层地震勘探、断面钻探和年代测定等方法,对震中区的马iao-Puqian 断层(MPF)中段进行了详细研究。结果表明,"马村-罗豆 "断裂带中段由三条近平行的正断层组成,呈右旋走向滑动:"马村-罗豆断层(F2-1)、海秀-东源断层(F2-2)和长流-竹溪河断层(F2-3)。其中 F2-2 断层由 F2-2′ 和 F2-2″ 两条次级断层组成,地下埋藏有花朵状构造。它近东西向分布,向北倾斜,自中新世以来至少经历了五个活动阶段。自全新世以来,F2-2′和 F2-2″ 的垂直活动速率分别为 ∼2.32 和 ∼2.5 mm/a。自中新世以来,共经历了八个周期的横断和回归。断层活动导致全新世地层增厚,悬壁向南略微倾斜,呈现 V 形特征。1605年琼山M7½地震的震源断层很可能就是该断层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismogenic Structure of the 1605 Qiongshan M7½ Earthquake and Its Holocene Activity History in Northern Hainan Island, China: Evidence from Cross-Section Drilling and Shallow Seismic Profile

The 1605 M7½ Earthquake is the only earthquake in the history of China that has caused large-scale land subsidence into the sea, with the total area of land subsidence exceeding 100 km2. The disaster has led to the sinking of 72 villages. There is still no clear understanding of the source seismogenic fault of this earthquake. In this work, we conducted a detailed study of the middle segment of the Maniao-Puqian fault (MPF), which is the epicenter area, through geomorphological survey, data collection, shallow seismic exploration, cross-section drilling, and chronological dating. The results showed that the middle segment of the MPF zone is composed of three nearly parallel normal faults with a dextral strike-slip: “Macun-Luodou fault (F2-1), Haixiu-Dongyuan fault (F2-2), and Changliu-Zhuxihe fault (F2-3)”. And F2-2 is composed of two secondary faults, namely F2-2′ and F2-2″, with a flower-shaped structure buried under the ground. It is distributed nearly east-west, dipping to the north and has experienced at least five stages of activities since the Miocene. The vertical activity rates of F2-2′ and F2-2″ are ∼2.32 and ∼2.5 mm/a, since the Holocene, respectively. There were eight cycles of transgression and regression since the Miocene. The fault activity resulted in the thickening of the Holocene strata with a slight dip to the south, on the hanging wall, showing V-shaped characteristics. The MPF is likely the source seismogenic fault of the M7½ earthquake that hit Qiongshan in 1605.

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来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
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