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- Title
中强地震发震构造标志浅析 --以2023年积石山Ms6. 2地震为例茅.
- Authors
张军龙; 徐岳仁; 李文巧; 陈 峰
- Abstract
Surface rupture is an important fea_ture of earthquake occurrence, and a valuable tool for studying earthquake dynamics and tectonic deformation. It is generally believed that surface ruptures are only formed by earthquakes with magnitudes of M6% or greater. However, in recent years, surface ruptures have also been observed in earthquakes with magnitudes of M6. 0 or less. This study aims to explore the methods for identifying surface ruptures in moderate earthquakes. The identification of the seismic structures of moderate earthquakes is challenging, mainly due to the following factors:① the relatively small scale of surface ruptures in moderate earthquakes (such as displacement, width, length, and depth), making them easily covered by thick loess and hidden;② non--tectonic fractures interfere with the identification of tectonic fractures. In this study, we conducted a preliminary analysis of the identification markers of the seismic structures of moderate earthquakes based on the Jishishan Ms6. 2 earthquake. We proposed the following identification markers. ① geometrie distribution and profile morphology of surface ruptures, linear distribution of secondary disasters (landslides, collapses, sand liquefaction, etc.) associated with earthquakes provides references and clues for identifying the seismic structure; ② the rupture runs stably across different geomorphic units along the rupture direction and a_t lea_st crosses one low terrain such as a gully; ③ the rupture on the geological profile shows a st able dip; ④ tectonic morphology associa ted with surface rupt ures that develops alternating echelons folds (compressional mounds) and tension cracks along the rupture. The identification markers proposed in this study provide new ideas for the identification of the seismic structures of moderate earthquakes.
- Publication
Earthquake (1000-3274), 2024, Vol 44, Issue 1, p226
- ISSN
1000-3274
- Publication type
Article
- DOI
10.12196/j.issn.1000-3274.2024.01.021