| 2021年青海玛多MS7.4地震精定位和发震构造初探 |
| |
| 引用本文： | 尹欣欣,王维欢,蔡润,邓津,马丽.2021年青海玛多MS7.4地震精定位和发震构造初探[J].西北地震学报,2021,43(4):834-839. |
| |
| 作者姓名： | 尹欣欣 王维欢 蔡润 邓津 马丽 |
| |
| 作者单位： | 1.甘肃省地震局，甘肃 兰州 730000;2.中国地震局地球物理研究所，北京 100081;3.中冶成都勘察研究总院有限公司，四川 成都 610063;4.青海省地震局，青海 西宁 810000 |
| |
| 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（2021IESLZ4）；甘肃省地震局科研创新团队（2019TD-01-02）；国家自然科学基金面上项目（51578518） |
| |
| 摘 要： | 2021年5月22日青海省果洛州玛多县发生M_S7.4地震。为探究本次地震的发震构造及余震分布特征,选取2021年5月1日—6月3日青海测震台网观测到的33°～36°N,97°～99.5°E空间范围内的地震观测报告,利用双差精定位方法进行双差精定位处理。重定位后整体残差平均减小了0.23,深度在5～25 km间随机分布。根据地震迁移方向和震区地质构造,认为本次地震的发震构造为昆仑山口—江错断裂,玛多—甘德东段受主震触发影响爆发一系列小震,两条断裂之间可能因为本次地震产生一定联系。本次地震产生新的断裂,突破了两条断裂之前的空区,连接到玛多—甘德断层,使两条断层交叉相连,形成新的断层构造。
|
| 关 键 词： | 青海玛多7.4级地震 双差定位 发震构造 昆仑山口—江错断裂 玛多—甘德断裂 |
| 收稿时间： | 2021/6/7 0:00:00 |
Precise location of the 2021 Maduo, Qinghai MS7.4 earthquake and its seismogenic structure |
| |
| YIN Xinxin,WANG Weihuan,CAI Run,DENG Jin,MA Li.Precise location of the 2021 Maduo, Qinghai MS7.4 earthquake and its seismogenic structure[J].Northwestern Seismological Journal,2021,43(4):834-839. |
| |
| Authors: | YIN Xinxin WANG Weihuan CAI Run DENG Jin MA Li |
| |
| Institution: | 1.Gansu Earthquake Agency, Lanzhou 730000, Gansu, China;2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;3.Chengdu Surveying Geotechnical Research Institute Co Ltd. of MCC, Chengdu 610063, Sichuan, China;4.Qinghai Earthquake Agency, Xining 810000, Qinghai, China |
| |
| Abstract: | An MS7.4 earthquake occurred in Maduo County, Qinghai Province on May 22, 2021.To explore the seismogenic structure of the earthquake and the distribution characteristics of aftershocks, this paper selected the seismic observation reports from Qinghai Seismic Network in a space range of 33-36°N, 97-99.5°E from May 1 to June 3, 2021.After double difference relocation, the overall residual was reduced by an average of 0.23, and the depth was randomly distributed within 5-25 km.According to the earthquake migration direction and local geological structure, it is believed that the seismogenic structure of the MS7.4 earthquake is Kunlun Pass-Jiangcuo fault.A series of small earthquakes were triggered by the main earthquake and then occurred along the east section of Maduo-Gande fault.The earthquake may cause some connection between the two faults.A new fault was generated by the earthquake and then connected with the Maduo-Gande fault, so that the two faults crossed and connected, forming a new fault structure. |
| |
| Keywords: | Maduo Qinghai MS7 4 earthquake double difference location seismogenic structure Kunlun Pass-Jiangcuo fault Maduo-Gande fault |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《西北地震学报》浏览原始摘要信息 |
| 点击此处可从《西北地震学报》下载免费的PDF全文 |
|
