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- Title
东昆仑断裂带活动速率研究概观.
- Authors
李建军; 李文巧; 贡秋卓玛; 司金罗布; 次仁多吉; 李佳怡; 张军龙
- Abstract
Since the neotectonic period, the Qinghai-Tibet Pla/teau has undergone intense uplift and eastward sliding. The East Kunlun Fault Zone (EKF) is one of the major sinistral str ike-slip faul ts in the Qinghai-Tibe t Pla/t eau. Its ra/te of activity has become one of the key data to understand this process. In recent years, the EKF activity ra/te has been obtained through methods such as remote sensing, geological surveys, paleoearthquakes, and geodesy. The time scale of different research methods ranges from decades to tens of thousands of years. Therefore, the differences in resuIts and their reasons can be analyzed from different disciplines. Furthermore, it is formed through a phased understanding of the variation in the EKF activity rate. The resuIts show that the EKF exhibits typical str ike-slip faul t geome try. Its structure changes from simple to complex "horse -t ail" shaped forms as one moves from west to east. The eastern endpoint is limited by the struc-- tu ral t rend change zone bet ween the EKF, Minjiang Fault, and Longmenshan Fault. The horizontal slip rate decreases overall from west to east. Taking the Animaqing Mountains (99°E〜100°E) as the boundary, the horizontal activity rate in the western region is basically st able at 10 〜12 mma, with little change, and the horizontal activity rate in the eastern region is 1 〜12 mma, which is not greater than that in the west, but is more contro versial. In the case of similar geomorphological dislocations and geode tic data, the difference in activity rates may be related to the difference in the initial age of dislocations and the post-earthquake viscoelastic relaxation effect. Most of the reduced activity rate may be due to secondary fauIts of the East Kunlun fault and internal faults of the Bayan Har block, or to the Minshan uplift on the east side. Sporadic resuIts show that the vertical motion rate on the west side is about 10 關 of the horizontal activity rate, while the vertical motion rate on the east side gradually increases. This indicates that part of the horizontal deformation on the west side is still converted to vertical uplift on the east side. At present, when the horizontal motion of the East Kunlun fault zone has been studied in dep th, future research can try to suppiemen t the study of vert ical motion and use the change of the ratio of horizontal and vertical velocities to explore the transformation process of horizontal str ike-slip and vert ical uplif t deformation. D 辻 fere nt disciplines have different understandings of the EKF activity rate, which is due to the complex geometrie structure of the fault zone and differences in research methods across disciplines on the spatiotemporal scale.
- Publication
Earthquake (1000-3274), 2024, Vol 44, Issue 1, p118
- ISSN
1000-3274
- Publication type
Article
- DOI
10.12196/j.issn.1000-3274.2024.01.009