| Exploration and Study of Deep Crustal Structure in the Quanzhou Basin and Its Adjacent Area |
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| 作者姓名： | Zhu Jinfang |
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| 作者单位： | Zhu Jinfang~ 1)，Fang Shengming~ 2)，Zhang Xiankang~ 2)，Qu Guosheng~ 3)，Huang Zonglin~ 1)，Hong Xing~ 1)，Liu Baojin~ 2)，Yang Zhuoxin~ 2) and Duan Yonghong~ 2) 1) Earthquake Administration of Fujian Province，Fuzhou 350003，China2) Geophysical Exploration Center，CEA，Zhengzhou 450002，China3) National Earthquake Response Report Service，Beijing 100049，China |
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| 基金项目： | ACKN0WLEDGMENTS Thanks are extended to Zhao Chengbin, Tian Xiaofeng, et al. for participating in the fieldwork and data processing and interpretation, and to the Earthquake Administration of Quanzhou City and relevant agencies and organizations for their support. |
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| 摘 要： | INTRODUCTIONQuanzhou Citylocates on the southeast coast of Fujian Province .Tectonically,it locates in thevolcanic fault depression zone in East Fujian betweenthe Wuyi-Daiyunfolded doming-upregion of theSouth China block and the depression zone of the Taiwan Straits . Being on the north segment of thesoutheast seismic belt of China , many destructive earthquakes inthe history affected the area and theregional seismicityis closelyrelated withfaulting.Inthe Quanzhou basin,large-scalelo…
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| 关 键 词： | 地震 反射 地壳结构 深部结构 |
| 收稿时间： | 2006-05-09 |
| 修稿时间： | 2006-06-09 |
Exploration and Study of Deep Crustal Structure in the Quanzhou Basin and Its Adjacent Area |
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| Zhu Jinfang.Exploration and Study of Deep Crustal Structure in the Quanzhou Basin and Its Adjacent Area[J].Earthquake Research in China,2006,20(3):305-315. |
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| Authors: | Zhu Jinfang |
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| Institution: | Earthquake Administration of Fujian Province, Fuzhou 350003, China |
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| Abstract: | The Quanzhou basin and its adjacent areas locate in the middle of the southeastern coast seismic belt on the Chinese mainland. The very fine geometry structure of this area from near ground to Moho interface and the relationship between the deep and shallow faults are obtained based on deep seismic reflection profiling. This profile is the first deep seismic reflection profile in this area and it indicates that the crust can be divided into the upper crust and the lower crust and the thickness of crust is from 29.5 km to 31 km in this area. The upper crust and the lower crust can be also divided into two layers. There are shallow normal faults developed in the upper crust and extending to the depth from 6 km to 12 km. The angle of those listric faults decreases with depth and the faults joint into the C_1 interface (detachment surface). There is a high angle fault under the Yong'an-Jinjiang fault belt which cuts off the interface of the upper crust and the lower crust and the Moho interface. Although there is no connection between the shallow and the deep faults, it offers deep structural environment for moderate and strong earthquake because of the deep high angle fault. This exploration result improves the reliability and precision of explanation of deep crustal structure in this area. The pull-apart and listric normal fault model indicates that the upper crust structure accords to the dynamic process of Taiwan Straits. This is helpful for seismicity estimation of Quanzhou and its adjacent area and important for obtaining more of the dynamic process of the southeast coast seismic belt. |
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| Keywords: | Deep seismic reflection Crust-mantle structure Deep structure |
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