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| Bouguer gravity study of middle section of Tanlu fault | |
| 作者姓名： | 唐新功 陈永顺 唐哲 |
| 作者单位： | [1]Department of Geophysics, Peking University, Beijing 100871, China [2]Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Jingzhou 434023, China [3]Crust Movement Monitoring Engineering and Research Center, China Earthquake Administration, Beijing 100029, China |
| 基金项目： | National Natural Science Foundation of China （40125011） and Excelent Youth Foundation. |
| 摘 要： | Although Tanlu fault is one of the most important tectonic fault zones and active earthquake belts in eastern China, little is known about its deep structure. In this study, we use the existing Bouguer gravity data to study the middle section of the Tanlu fault zone, which is also known as the Yishu fault zone. Our gravity inversion results indicate that the Moho has an abrupt offset in depth at the Tanlu fault zone and it has a relatively smooth variation away from the fault zone. The crustal structures on both sides are different from each other. Sediment is thin on the west side with an average thickness of less than 5 km, while it is as thick as 6 km on the east side. The thinnest sediment （3-4 km） is at the fault zone. Moho depth increases from 33 to 34 km on east side and from 36 to 38 km on west side. Tanlu fault zone is shown as a wide zone of linear gradient in the Bouguer gravity anomaly. |
| 关 键 词： | 地震 地球 重力场 断层 |
| 文章编号： | 1000-9116（2006）06-0650-08 |
| 收稿时间： | 2006-03-22 |
| 修稿时间： | 2006-05-27 |
Bouguer gravity study of middle section of Tanlu fault |
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| TANG Xin-gong,CHEN Yong-shun,TANG Zhe.Bouguer gravity study of middle section of Tanlu fault[J].Acta Seismologica Sinica(English Edition),2006,19(6):650-657. | |
| Authors: | TANG Xin-gong CHEN Yong-shun TANG Zhe |
| Institution: | 1. Department of Geophysics, Peking University, Beijing 100871, China;Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Jingzhou 434023, China 2. Department of Geophysics, Peking University, Beijing 100871, China 3. Crust Movement Monitoring Engineering and Research Center, China Earthquake Administration, Beijing 100029,China |
| Abstract: | Although Tanlu fault is one of the most important tectonic fault zones and active earthquake belts in eastern China, little is known about its deep structure. In this study, we use the existing Bouguer gravity data to study the middle section of the Tanlu fault zone, which is also known as the Yishu fault zone. Our gravity inversion results indicate that the Moho has an abrupt offset in depth at the Tanlu fault zone and it has a relatively smooth variation away from the fault zone. The crustal structures on both sides are different from each other. Sediment is thin on the west side with an average thickness of less than 5 km, while it is as thick as 6 km on the east side. The thinnest sediment (3~4 km) is at the fault zone. Moho depth increases from 33 to 34 km on east side and from 36 to 38 km on west side. Tanlu fault zone is shown as a wide zone of linear gradient in the Bouguer gravity anomaly. |
| Keywords: | Tanlu fault gravity Moho discontinuity |
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