重庆垫江<i>M</i><sub>S</sub>4.4地震：一个可能发生在浅地表的地震

黄世源; 李翠平; 王赞军; 高见; 郭卫英

doi:10.11939/jass.20190094

重庆垫江M_S4.4地震：一个可能发生在浅地表的地震

中国重庆 401147 重庆市地震局

基金项目: 地震科技星火计划项目（XH18037Y）和重庆市地震局科技创新团队项目共同资助

详细信息

通讯作者:
黄世源: e-mail：hsy_email@126.com

中图分类号: P315.3^＋3
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出版历程
- 收稿日期: 2019-05-22
- 修回日期: 2019-07-29
- 网络出版日期: 2020-04-09
- 刊出日期: 2019-12-31

Dianjiang，Chongqing，M_S4.4 earthquake：A possible shallow surface earthquake

Chongqing Earthquake Agency，Chongqing 401147，China

摘要

摘要:
为更好地认识2016年8月11日重庆垫江M_S4.4地震的发震成因，本文首先分析了近场地震台站记录到的该地震产生的短周期面波（Rg）强频散现象，该现象表明本次地震具有明显的浅震特征。然后采用CAP方法反演了该地震的震源机制解和震源深度，结果显示本次地震是走向为近EW向的逆冲型地震，矩震级为M_W4.1，最佳震源深度为1—2 km。在此基础上，结合现场震害、烈度等震线长轴方位和地质剖面图等资料，分析认为在区域应力集中加载作用下，震源区沉积盖层内部的软弱地层产生挤压变形，导致地层内斜交的裂隙发生切层失稳滑动，从而诱发了垫江M_S4.4地震，同时排除了震源区NE走向的黄钦垭口地表断层为发震构造的可能。
- 重庆垫江M_S4.4地震 /
- 震源深度 /
- 震源机制解 /
- 地震成因
Abstract:
In order to better explore the causes of the M_S4.4 earthquake occurred on August 11 2016, in Dianjiang, Chongqing, this paper analyzes the strong dispersion of Rayleigh surface wave, and the phenomenon suggests that this earthquake has obvious shallow-source earthquake characteristics. Then, we obtained the focal mechanism and focal depth of the earthquake with CAP method. The results show that the earthquake is a thrust event with strike of nearly EW-trending, the moment magnitude is M_W4.1 and the estimated focal depth is 1−2 km. Finally, from the comprehensive research on mechanism solution, earthquake field damages, the isoseismal curve major axis direction and the geological section, we conclude that the Dianjiang M_S4.4 earthquake is caused by the slip of oblique fractures in the interlayers resulted from compressive deformations of soft strata in sedimentary covers under the concentrated loading of the regional stress field, excluding the possibility of the NE-trending Huangqinyakou fault as the seismogenic structure of the Dianjiang M_S4.4 earthquake.
- Dianjiang, Chongqing, M_S4.4 earthquake /
- focal depth /
- focal mechanism solu-tion /
- seismogenesis
重庆市地震局. 2016. 重庆垫江M_S4.4地地震烈度调查与科考报告。10−11.

四川省地质局107地质队. 1975. 垫江幅1 ∶ 20万区域地质调查报告.

四川省地质局107地质队. 1975. 垫江幅1 ∶ 20万区域地质调查报告.

重庆气矿. 2016. 垫江采输气作业区生产情况报告.

HTML全文

重庆市地震局. 2016. 重庆垫江M_S4.4地地震烈度调查与科考报告。10−11.

四川省地质局107地质队. 1975. 垫江幅1 ∶ 20万区域地质调查报告.

四川省地质局107地质队. 1975. 垫江幅1 ∶ 20万区域地质调查报告.

重庆气矿. 2016. 垫江采输气作业区生产情况报告.

图 1 垫江M_S4.4地震震中及台站分布（有名称标注的台站上出现了Rg波）

Figure 1. Location of the epicenter of Dianjian M_S4.4 earthquake and distribution of seismic stations where Rg wave appeared at the stations labeled with name

下载: 全尺寸图片幻灯片

图 2 研究区地壳速度模型（引自赵珠，张润生，1987）

Figure 2. The crustal velocity model used for the studied region （after Zhao，Zhang，1987）

下载: 全尺寸图片幻灯片

图 3 震源机制解随矩心深度的变化及相应拟合误差

Figure 3. Variation of the focal mechanism solution with centroid depth and their erros

下载: 全尺寸图片幻灯片

图 4 震源机制解以及理论地震图（红线）与观测地震图（黑线）对比

最左侧一列给出了台站的名称及其震中距（单位：km）；地震波形下面第一行数字为理论地震图相对观测地震图的时移（单位：s），第二行数字为二者的相关系数

Figure 4. The focal mechanism inversion result and comparison of synthetic waveforms （red lines） with observed ones （black lines）

The left column is the name of the stations and its epicentral distance （unit in km）. The first-row numbers beneath the seismograms are the time shifts （unit in s），and the second row numbers are their cross-correlation coefficient

下载: 全尺寸图片幻灯片

图 5 台站垂直分量波形记录

Figure 5. The vertical component waveform of station

下载: 全尺寸图片幻灯片

图 6 垫江M_S4.4地震震中地质构造和烈度分布（a）及沿AA ′ 的地质剖面图（b）^①

Figure 6. Geological structure and intensity distribution （a） of the epicenter of Dianjiang M_S4.4 earthquake as well as geological section along AA ′ （b）

下载: 全尺寸图片幻灯片

表 1 基于CAP方法和P波初动方法反演所得垫江M_S4.4地震的震源机制解参数

Table 1 Parameters of focal mechanism solution of Dianjiang M_S4.4 earthquake based on CAP method and P-wave first motion method

来源	方法	节面Ⅰ			节面Ⅱ			P轴		T轴		N轴
来源	方法	走向/°	倾角/°	滑动角/°	走向/°	倾角/°	滑动角/°	方位角/°	倾角/°	方位角/°	倾角/°	方位角/°	倾角/°
本文	CAP	290	31	112	85	61	77	184	15	323	70	200	59
黄世源等（2017）	P波初动	311	41	139	74	64	56	188	13	298	57	90	30

下载: 导出CSV

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