A rock fall of the north Zhongtiao Shan fault and the Yongji earthquake in 793, Shanxi Province, North China
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- 作者：Jianguo Xiong ; Youli Li ; Supei Si ; Shenghua Lv…
- 关键词：Rock fall ; 10Be ; Cosmogenic radionuclide ; Paleoearthquake ; Historical earthquake ; North Zhongtiao Shan fault ; Shanxi Graben System
- 刊名：Arabian Journal of Geosciences
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：9
- 期：18
- 全文大小：1,807 KB
- 刊物类别：Earth and Environmental Science
- 出版者：Springer Berlin Heidelberg
- ISSN：1866-7538
- 卷排序：9
文摘
Earthquake is the main driving factor of landslides, and a large number of empirical formulas for seismic parameters have been proposed. This article studies a rock avalanche triggered by a paleoearthquake and two trial trenches in Yongji, Shanxi Province. Six quartz samples were collected from different parts on the top of the boulder, and the youngest 10Be exposure age is 1173 ± 123 years, which is considered as the occurrence time of the rock fall. The trenches excavated near the boulder infer that there was an earthquake between 2000 ± 110 and 465 ± 45 cal a bp in the north Zhongtiao Shan (NZS) fault with a maximum vertical displacement of 1.5 m and the surface rupture length (SRL) of ~35 km corresponding to a magnitude (MS) of 6.70 ± 0.12 based on the displacement. Taking into account the occurrence time and minimum magnitude triggering the rock fall, the latest paleoearthquake revealed by trenches may be the forcing factor. Furthermore, according to historical records of Yongji, the earthquake of magnitude 6 in ad 793 is in consistency with the occurrence time and magnitude of the earthquake triggering the landslide. Therefore, the rock fall is related to the paleoearthquake revealed by the trenches, which may be the 793 Yongji earthquake.