Analysis of segmentation and maximum potential seismicity of Tarwan-Dengdengshan-Chijiaciwo fault
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摘要: 塔尔湾—登登山—池家刺窝断裂是阿尔金断裂东端发育的多条北西向断裂中规模最大的一条，对于该断裂前人在活动时代、活动速率、古地震期次等方面做了大量工作，但对于该断裂的分段特征及最大潜在地震的分析较少。本文在前人研究成果的基础上，根据活动断层分段的原则对该断裂进行了分段，并根据经验公式，评估了断层各段落的最大潜在地震。
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关键词:
- 塔尔湾—登登山—池家刺窝断裂 /
- 断层分段 /
- 最大潜在地震
Abstract: There are many NW-trending faults in the eastern segment of the Arguin fault. Their new activity characteristics are of great significance to the analysis of the neotectonic evolution of the east end of the Arguin fault. The Tarwan-Dengdengshan-Chijiaciwo fault is one of the largest faults of them. A lot of works have been done on the active age, active rate and paleoearthquake period of the fault. However, the studies of segmentation characteristics and the analysis of the maximum potential earthquake on the fault are few. In this paper, based on previous research results, we put forward the segmentation and the maximum potential earthquake of the fault according to the fault segmentation principle. -
图 1 塔尔湾—池家刺窝断裂及其附近地震构造图（黑色方框内为目标断裂）
F1：祁连山断裂旱峡—大黄沟段；F2：阿尔金断裂昌马大坝—赤金堡段；F3：照壁山—宽滩山北断裂；F4：宽滩山断裂； F5：头道河—赤金北窑断裂；F6：塔儿湾—登登山—池家刺窝断裂；F7：下东号断裂；F8：生地湾断裂；F9：干峡山断裂； F10：合洛山断裂；F11：花海断裂
Figure 1. Seismic tectonic map of the nearby of Tarwan-Chijiaciwo fault （the target fracture is inside the black box）
图 4 塔尔湾—登登山—池家刺窝断裂分段结构示意图
Figure 4. Sketch map of segment structure of Tarwan-Dengdengshan-Chijiaciwo fault
表 1 断裂分段特征及相关参数
Table 1. Fracture segmentation characteristics and related parameters
断裂分段 分段
长度/km活动时代 地貌特征 古地震情况 最大位
错量/m最大潜在
地震震级西段（塔儿湾断裂） 10 早—中
更新世地貌上为高几十厘米至5 m的地形陡坎。陡坎倾向NE，组成陡坎的地层主要有早更新世砾岩和全新世风积砂土等 无 无 不判定为
发震构造中段（登登山断裂） 19 全新世 断错除I级阶地以外的其他地貌面，陡坎最大高度2.6 m，普遍在1.5 m左右 3次古地震事件，事件Ⅰ发生于距今大约0.5万年；事件Ⅱ大致发生于距今2万年，事件Ⅲ大致发生于距今3.5万年左右 1.2 7.0 东段（池家刺窝断裂） 6.5 全新世 断错所有三级地貌面，陡坎最大高度为4 m，普遍在2 m左右 3次古地震事件，事件Ⅰ发生于全新世早中期；事件Ⅱ大致发生于距今1万年左右，事件Ⅲ大致发生于距今2.7万年左右 1.5 7.0 
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