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

Abstract

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.

Keywords

seismogenic structure / earthquakes / Maniao-Puqian fault / fault activity history / geomorphology

References

[] Chen E M, Huang Y Y. Preliminary Discussion on the 1605 Qiongzhou Earthquake and Its Seismogenetic Structure. Seismology and Geology, 1979, 1(4): 37-44 99–100 (in Chinese with English Abstract)

[] Chen E M, Huang Y Y. Characteristics of the Seismic Damage and Analysis of the Seismic Structure of the 1605 Great Earthquake of Qiongzhou, Hainan Island. Acta Seismologica Sinica, 1989, 11(3): 319-331 (in Chinese with English Abstract)

[] Chen J J, Leng C B, Fu L B, et al.. Genesis of Delong Granite in East Kunlun Orogen and Its Implication on the Evolution of Paleo-Tethys Ocean. Earth Science, 2024, 49(2): 560-576 (in Chinese with English Abstract)

[] Deng Q D, Wang Y P, Zhang P Z. . Research on Active Fault 8, 2001 Beijing Seismological Press (in Chinese with English Abstract)

[] Ding Y Z. . A Collection of Earthquake Studies in Northern Hainan Island, 1988 Beijing Seismological Press (in Chinese with English Abstract)

[] Fan Q C, Sun Q, Li N, et al.. Periods of Volcanic Activity and Magma Evolution of Holocene in North Hainan Island. Acta Petrologica Sinica, 2004, 20(3): 533-544 (in Chinese with English Abstract)

[] Geological Survey Institute of Hainan Province. . Regional Geology of Hainan Province, 2019 Beijing Geological Publishing House (in Chinese)

[] Hu D G, Ma X M, Jia L Y, et al.. . Investigation of Active Faults and Evaluation of Crustal Stability in Pan Pearl River Delta, 2019 Beijing Institute of Geomechanics, Chinese Academy of Geological Sciences 28-73 (in Chinese with English Abstract)

[] Hu Y X, Hao M, Ji L Y, et al.. Three-Dimensional Crustal Movement and the Activities of Earthquakes, Volcanoes and Faults in Hainan Island, China. Geodesy and Geodynamics, 2016, 7(4): 284-294,

[] Huang Z G, Cai F X. A New Approach to the Quaternary Volcanitcity in the Leiqiong Area. Tropical Geography, 1994, 14(1): 1-10 (in Chinese with English Abstract)

[] Jia S X, Li Z X, Xu Z F, et al.. Crustal Structure Features of the Leiqiong Depression in Hainan Province. Chinese Journal of Geophysics, 2006, 49(5): 1385-1394 (in Chinese with English Abstract)

[] Li F R, Xiong F H, Ma C Q, et al.. Petrogenesis of Triassic Hongshuihe Granitoids in East Kunlun: Implications for the Paleo-Tethyan Orogeny. Earth Science, 2024, 49(2): 639-655 (in Chinese with English Abstract)

[] Li J H, Zhang Y Q, Dong S W, et al.. Late Mesozoic–Early Cenozoic Deformation History of the Yuanma Basin, Central South China. Tectonophysics, 2012, 570: 163-183

[] Li P, Yang M E, Liu X S, et al.. . A Collection of Earthquake Studies in Northern Hainan Island, 1988 Beijing Seismological Press 41-52 (in Chinese with English Abstract)

[] Li W, Jia L Y, Hu D G, et al.. Late Pleistocene Tectonic History of the Western Segment of Maniao-Puqian Fault: Evidence from the Laocheng Section, Northern Hainan Island. Geoscience, 2019, 33(5): 970-978 (in Chinese with English Abstract)

[] Li Z X, Zhao W J, Liu G X. A Study on Deep Crust Structures and Stress Situation of the 1605 Qiongshan Strong Earthquake. South China Journal of Seismology, 2006, 26(1): 28-36 (in Chinese with English Abstract)

[] Lin Z Y, Hu H X, Zhu L B, et al.. Preliminary Results of Crustal Structure Study in Leiqiong Area. A Collection of Earthquake Studies in Northern Hainan Island, 1988 Beijing Seismological Press 127-139 (in Chinese with English Abstract)

[] Liu F X, Miao Y Y, Jing Z J, et al.. Late Pleistocene Activities Characteristics of Western Segment of Puqian-Qinglan Fault. Global Geology, 2018, 37(1): 148-153 (in Chinese with English Abstract)

[] Liu H G, Li F, Jia Q C. Activity Discussion of the Western Segment of the Maniao-Puqian Fault Revealed by Drilling. South China Journal of Seismology, 2018, 38(1): 47-53 (in Chinese with English Abstract)

[] Liu H, Hong H J, Ran H L, et al.. Dynamic Mechanism of Volcanic Belt and New Understanding from Earthquake Evidence in Northern Hainan Island, China. Chinese Journal of Geophysics, 2008, 51(6): 1804-1809 (in Chinese with English Abstract)

[] Liu Y, Hu D G, Xu S F, et al.. Electrical Anisotropic Structure in the Quaternary Volcanic Region of North Hainan Island and Its Geological Implications. Earth Science, 2020, 45(1): 330-340 (in Chinese with English Abstract)

[] Long H G, Lin Y H, Zhu Y H, et al.. Establishment of the Early–Mid Pleistocene Duowen Formation on Northern Hainan Island, China. Geological Bulletin of China, 2006, 25(3): 408-414 (in Chinese with English Abstract)

[] Peng X, Li C F, Song T R, et al.. Deep Structures and Lithospheric Breakup Processes at Northern Continent-Ocean Transition Zone of the South China Sea. Earth Science, 2022, 47(11): 4245-4255 (in Chinese with English Abstract)

[] Ren Z H, He X L. Discussion on the Location of the ‘Aftershocks’ of the Macroquake Occurred in 1605 from the Point of View of Active Tectonics. South China Journal of Seismology, 2006, 26(1): 9-16 (in Chinese with English Abstract)

[] Sun J Z, Yan F H. . Study on Quaternary Stratigraphic Chronology in Northern Hainan. A Collection of Earthquake Studies in Northern Hainan Island, 1988 Beijing Seismological Press 17-25 (in Chinese with English Abstract)

[] Wang C Q, Jia L Y, Hu D G, et al.. Activity Characteristics of the Eastern Maniao-Puqian Fault, Northern Hainan Island and Its Evaluation of Crustal Stability. Geology in China, 2021, 48(2): 618-631 (in Chinese with English Abstract)

[] Wang H J. Division of Cenozoic Strata in Leiqiong Area, Guangdong Province. Journal of Stratigraphy, 1981, 5(3): 221-225 (in Chinese)

[] Xia M M, Wang C Q, Hu D G, et al.. ESR Dating of the Basuo Formation in the Northeastern Hainan Island and Its Tectonic Significance. Journal of Geomechanics, 2019, 25(2): 257-266 (in Chinese with English Abstract)

[] Xu Q H. Discussion on Subsidence Mechanism of Qiongshan Earthquake. South China Journal of Seismology, 1985, 5(4): 33-40 (in Chinese with English Abstract)

[] Xu Q H. Recent Sinking in the Dongzhai Harbour Area, Northern Qiongzhou. Marine Sciences, 1986, 10(1): 24-28 (in Chinese with English Abstract)

[] Xu Q H. An Understanding of Seismic Geology in Lei Qiong Depression. South China Journal of Seismology, 1986, 6(1): 83-93 (in Chinese with English Abstract)

[] Xu Q H. Formation and Migration of Dongzhai Port in the Northern Hainan Island and the Major Qiongzhou Earthquake of 1605. Seismology and Geology, 1986, 8(3): 92-96 (in Chinese with English Abstract)

[] Xu Q H. The Land Sank into the Sea and Possible Tsunami by the Great Earthquake in Qiongzhou in China in 1605. Acta Oceanologica Sinica, 2007, 29(3): 146-156 (in Chinese with English Abstract)

[] Xu S C, Gao X K, Li H Y. Large Area Subsidence may be Evidence of Phase Change in Source Region—Preliminary Study on the Genesis of Qiongzhou Earthquake. South China Journal of Seismology, 1982, 2(1): 3-7 (in Chinese with English Abstract)

[] Xu X W. . An Introduction to Urban Active Faults in China, 2015 Beijing Seismological Press 380-403 (in Chinese with English Abstract)

[] Xue W J. On the Age and Sedimentation Environment of Beihai Formation. Marine Geology & Quaternary Geology, 1983, 3(3): 35-52 (in Chinese with English Abstract)

[] Yang M E, Li P, Dou Y Q. Discussion on the Relationship between Quaternary Volcanic Activity and Fault Activity in Qiongbei Area. A Collection of Earthquake Studies in Northern Hainan Island, 1988 Beijing Seismological Press 63-71 (in Chinese with English Abstract)

[] Zhang G W, Guo A L, Wang Y J, et al.. Tectonics of South China Continent and Its Implications. Science China Earth Sciences, 2013, 56(11): 1804-1828,

[] Zhang Y M, Zhang R J, Yao H Z, et al.. The Precambrian Crustal Tectonic Evolution in Hainan Island. Earth Science—Journal of China University of Geosciences, 1997, 22(4): 395-400 (in Chinese with English Abstract)

[] Zhao Y H, Tong D J, Song Y, et al.. Seismic Reflection Characteristics and Evolution of Intrusions in the Qiongdongnan Basin: Implications for the Rifting of the South China Sea. Journal of Earth Science, 2016, 27(4): 642-653,

[] Zhou Y, Zhao Y S, Cai Y F, et al.. Permian-Triassic Magmatism in the Qin-Fang Tectonic Belt, SW China: New Insights into Tectonic Evolution of the Eastern Paleo-Tethys. Journal of Earth Science, 2023, 34(6): 1704-1716,