安宁河断裂西支全新世活动证据

罗浩; 李佩; 朱志强; 徐伟; 余秋兵; 刘志成; 高玮; 周青春; 钟慧; 高战武

doi:10.11899/zzfy20230404

安宁河断裂西支全新世活动证据

doi: 10.11899/zzfy20230404

罗浩^1,,
李佩^1, ,,
朱志强²,
徐伟¹,
余秋兵³,
刘志成¹,
高玮¹,
周青春¹,
钟慧¹,
高战武¹

1.
中国地震灾害防御中心, 北京 100029
2.
中国石油天然气股份有限公司西藏销售分公司, 拉萨 850000
3.
四川省第五地质大队, 成都 610081

基金项目: 国家科技基础资源调查专项（2021FY100103）；地震科技星火计划（XH21047）

详细信息

作者简介:
罗浩，男，生于1980年。博士，高级工程师。主要从事地震地质和地质灾害方面的研究。E-mail: hy-luo@163.com

通讯作者:
李佩，女，生于1991年。博士，工程师。主要从事地震地质和第四纪环境方面的研究。E-mail: lipei911223@126.com

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出版历程
- 收稿日期: 2023-07-15
- 刊出日期: 2023-12-01

Holocene Activity Evidence of West Branch of Anninghe Fault in Southeastern Tibet

1.
China Earthquake Disaster Prevention Center, Beijing 100029, China
2.
Petrochina Xizang Marketing Company, Lhasa 850000, China
3.
The 5th Geological Brigade of Sichuan, Chengdu 610081, China

摘要

摘要: 安宁河断裂是川滇菱形块体东边界主要构成断裂之一，在冕宁县城附近因南河断裂与其汇交，导致该区域断层几何结构复杂。通过地质考察和探槽开挖，新发现了一段全新世活动断裂，命名为安宁河断裂西支。通过典型断错地貌位移测量和年代学样品测试得到调查点左旋滑动速率为（1.6±0.2）mm/a。开挖的古地震探槽揭示了2次古地震事件，分别为（2 300 ±30）～（1 700±30） a BP之间的一次地震和公元1536年7½级地震。已有研究在安宁河断裂南段获得的2次大地震事件与本次探槽揭示的地震事件时间较好地对应，说明安宁河断裂南段的大震事件可能导致了安宁河断裂西支同时破裂。
- 安宁河断裂 /
- 安宁河断裂西支 /
- 古地震 /
- 滑动速率 /
- 活动断层
Abstract: Anninghe fault controls eastern boundary of Sichuan-Yunnan rhomboid block, and its structure is complex near Mianning County. Based on geological investigation and excavation, the fault is Holocene fault in chronology. Combined with offset geomorphology and chronology, the left-lateral slip rate of the fault is 1.8 mm/a. The excavation indicates that the West branch of the Anninghe fault has occurred two Paleoearthquakes since 2130 a BP at least, whose active ages are (2300 ±30)～(1700±30) a BP and 1536 a, respectively. The west branch of the Anninghe fault does not have a large scale enough to trigger large earthquake. Two major seismic events in the southern segment of the Anninghe fault caused the simultaneous rupture of the western branch of the fault.
- Anninghe fault /
- Western branch of the Anninghe fault /
- Paleoearthquake /
- Slip rate /
- Holocene fault

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图 1 冕宁及邻区活动断裂与强震震中分布

Figure 1. Distribution of active faults and destructive earthquakes in Mianning and adjacent areas

下载: 全尺寸图片幻灯片

图 2 安宁河断裂和南河断裂展布

Figure 2. Diagrammatic sketch of Anninghe fault and Nanhe fault

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图 3 安宁河断裂西支几何展布

Figure 3. West branch of Anninghe fault

下载: 全尺寸图片幻灯片

图 4 安宁河断裂西支断错地貌特征

Figure 4. Offset landform of the west branch of Anninghe fault

下载: 全尺寸图片幻灯片

图 5 古地震探槽开挖位置

Figure 5. Location of excavated paleoseismic trench

下载: 全尺寸图片幻灯片

图 6 中村探槽南壁剖面

Figure 6. South wall of Zhongcun trench

下载: 全尺寸图片幻灯片

图 7 中村T₂阶地断错示意图

Figure 7. Offset T₂ terrace in Zhongcun

下载: 全尺寸图片幻灯片

图 8 中村T₂阶地¹⁴C样品采集位置

Figure 8. Location of the collected ¹⁴C Sample on the T₂ terrace in Zhongcun

下载: 全尺寸图片幻灯片

图 9 安宁河断裂与安宁河断裂西支发震模型

Figure 9. Seismic model of Anninghe fault and west branch of Anninghe fault

下载: 全尺寸图片幻灯片

表 1 ¹⁴C年代样品测试结果

Table 1. The results of ¹⁴C samples

样品号	样品年龄/a BP	采样位置	测试机构
20220116-¹⁴C-3	3410±30	阶地	BETA实验室
20220116-¹⁴C-4	210±30	探槽	BETA实验室
20220116-¹⁴C-8	1700±30	探槽	BETA实验室
20220116-¹⁴C-9	340±30	探槽	BETA实验室
20220116-¹⁴C-15	110±30	探槽	BETA实验室
20220116-¹⁴C-16	200±30	探槽	BETA实验室
20220116-¹⁴C-19	2130±30	探槽	BETA实验室

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