Late quaternary slip rate of the east segment of the Yushu fault in the central-eastern Tibetan Plateau
| Autor: | Junxiang Zhao, Zhenjie Jing, Furen Xie, Xuemeng Huang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010506 paleontology
geography geography.geographical_feature_category Plateau Fault (geology) 010502 geochemistry & geophysics Block (meteorology) Strike-slip tectonics 01 natural sciences law.invention Terrace (geology) law Radiocarbon dating Quaternary Seismology Geology 0105 earth and related environmental sciences Earth-Surface Processes Slip rate |
| Zdroj: | Quaternary International. 532:146-156 |
| ISSN: | 1040-6182 |
| Popis: | The Yushu fault is a mainly left-lateral strike slip fault with some normal component within the Ganzi-Yushu fault system in central-eastern Tibetan Plateau. In 2010, the catastrophic Yushu Ms 7.1 earthquake occurred along this fault, causing approximately 3000 casualties and widespread damages; however, the late Quaternary slip rate of this fault was not tightly constrained due to poor research. Based on the interpretation of satellite images, field measurement of the offset of terrace risers, optically stimulated luminescence (OSL) and radiocarbon (14C) dating of terrace ages, the late Quaternary slip rate of the east segment of the Yushu fault is estimated to be 6.8–8.2 mm/yr. In consideration of the partitioning effect of the Batang fault south of Yushu, the late Quaternary slip rate of the entire Yushu segment is approximately 9–12 mm/yr. Given the characteristic offset of about 6–8 m, the recurrence interval of large earthquakes along the Yushu fault is estimated to be approximately 750–1150 yr. This research provides basic parameters for the long-term seismic hazards assessment of the Yushu area and implies the limited southeastward extrusion rate (~10 mm/yr) of Qiangtang block relative to the Bayan Har block. |
| Databáze: | OpenAIRE |
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