Abstract
The Anninghe fault is an important active fault along the eastern boundary of Sichuan-Yunnan active tectonic block, and the study of its surface deformation and rupture behavior during strong earthquake in the late Quaternary is of fundamental importance for understanding the future seismic risk of the fault zone or even the entire western Sichuan region. Using the methods of detailed geomorphic and geological survey, digital image analysis, total station instrument survey, excavation of combined trench and dating, we analyze the geomorphologic sequences of the offset strata at several sites where the late Quaternary deformation remnants are fairly well preserved and obtain some new results as follows: Strong earthquake events with left-lateral displacements of about 3 m occurred at the two sites of Zimakua and Yejitong at 1634–1811, 1030–1050 and 280–550 a BP, respectively, and the recurrence interval is 520–660 a; The youngest event in the area of Dahaizi-Ganhaizi should be the earthquake of 1536, other events are at 1768–1826, 2755–4108 and 4108–6593 a BP, respectively, with a recurrence interval of 1300–1900 a. The strong earthquake activity shows a clustering character. The possibility of occurrence of a strong earthquake exists on the north segment of the Anninghe fault sometime in the future.
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Supported by the National Basic Research Program of China (Grant No. 2004CB418401)
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Ran, Y., Chen, L., Cheng, J. et al. Late Quaternary surface deformation and rupture behavior of strong earthquake on the segment north of Mianning of the Anninghe fault. Sci. China Ser. D-Earth Sci. 51, 1224–1237 (2008). https://doi.org/10.1007/s11430-008-0104-6
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DOI: https://doi.org/10.1007/s11430-008-0104-6