| 四川长宁MS6.0地震区域构造应力场特征分析 |
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| 引用本文： | 尹欣欣,郭安宁,赵韬,李少华.四川长宁MS6.0地震区域构造应力场特征分析[J].西北地震学报,2019,41(5):1215-1220. |
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| 作者姓名： | 尹欣欣 郭安宁 赵韬 李少华 |
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| 作者单位： | 甘肃省地震局, 甘肃 兰州 730000,甘肃省地震局, 甘肃 兰州 730000,陕西省地震局, 陕西 西安 710000,甘肃省地震局, 甘肃 兰州 730000;中国地震局黄土地震工程开放实验室, 甘肃 兰州 730000 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务费专项（2019IESLZ07，2015IESLZ04，2017 IESLZ09）；中国地震局地震科技星火计划项目（XH19043）共同资助 |
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| 摘 要： | 2019年6月17日在四川宜宾市长宁县（28.34°N，104.90°E）发生MS6.0地震，余震发育。本文利用区域测震台网的地震观测数据基于CAP方法计算了28°~29°N，104°~105°E范围内的14个MS>3.0以上地震的震源机制解，结合全球矩心矩张量目录和部分前人研究结果中该区域的共27个震源机制解数据，应用MSATSI软件反演了研究区域的应力场。将研究区域按0.1°×0.1°划分成25个应力网格，最终得到9个网格的应力分布结果，大多数应力场方向稳定，根据主震所在应力网格点得到主震的断层类型为主逆冲型。本文研究成果为四川长宁地区的孕震机理、活动构造以及地震趋势判定提供了可靠的参考依据。
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| 关 键 词： | 长宁地震 震源机制解 应力场反演 CAP震源机制解法 |
| 收稿时间： | 2018/11/11 0:00:00 |
Characteristics of the Regional Tectonic Stress Field of the Changning MS6.0 Earthquake, Sichuan Province |
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| YIN Xinxin,GUO Anning,ZHAO Tao and LI Shaohua.Characteristics of the Regional Tectonic Stress Field of the Changning MS6.0 Earthquake, Sichuan Province[J].Northwestern Seismological Journal,2019,41(5):1215-1220. |
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| Authors: | YIN Xinxin GUO Anning ZHAO Tao and LI Shaohua |
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| Institution: | Earthquake Agency of Gansu Province, Lanzhou 730000, Gansu, China,Earthquake Agency of Gansu Province, Lanzhou 730000, Gansu, China,Earthquake Agency of Shaanxi Province, Xi''an 710000, Shaanxi, China and Earthquake Agency of Gansu Province, Lanzhou 730000, Gansu, China;Open Laboratory of Loess Earthquake Engineering, China Earthquake Agency, Lanzhou 730000, Gansu, China |
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| Abstract: | On June 17, 2019, an MS6.0 earthquake occurred in Changning County, Yibin City, Sichuan Province (28.34°N, 104.90°E), China, followed by aftershocks.Seismic observation data from the regional seismic network were used to calculate the focal mechanism solutions of 14 MS>3.0 earthquakes in the range of 28°-29°N, 104°-105°E, based on the CAP method.Combined with data from 27 focal mechanism solutions of the study area from previous research results, the stress field of the study area was inverted using MSATSI software.After gridding the study area as 0.1°×0.1°, the distribution of 25 stress fields was obtained.Most of the stress fields were stable.The fault type of the mainshock was mainly a thrust earthquake according to the stress grid where the mainshock was located.Results of this paper can provide a reliable reference for seismogenic mechanisms, active structure, and the determination of seismic tendencies in the Changning area of Sichuan Province. |
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| Keywords: | Changning earthquake focal mechanism solution stress field inversion CAP method |
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