| 利用InSAR技术观测台湾花莲地震断层滑动与运动机理分析 |
| |
| 引用本文： | 梁斌,魏冠军.利用InSAR技术观测台湾花莲地震断层滑动与运动机理分析[J].测绘通报,2022,0(9):68-73. |
| |
| 作者姓名： | 梁斌 魏冠军 |
| |
| 作者单位： | 1. 兰州交通大学测绘与地理信息学院, 甘肃 兰州 730070;2. 地理国情监测技术应用国家地方 联合工程研究中心, 甘肃 兰州 730070;3. 甘肃省地理国情监测工程实验室, 甘肃 兰州 730070 |
| |
| 基金项目： | 国家自然科学基金(41964008);兰州交通大学优秀平台(201806) |
| |
| 摘 要： | 基于Sentinel-1卫星升降轨SAR数据,采用D-InSAR技术提取了2018年台湾花莲县Mw6.4地震的同震形变场。结果表明,2018年花莲地震造成的最大地表形变量为38.2 cm,以隆升为主,断层上下盘最大相对位移为50 cm。利用InSAR观测得到的升降轨地表形变数据,分别构建2018年与2021年台湾花莲两次地震的断层三维滑动分布模型。结果表明,2018年花莲Mw6.4地震主震断层为靠近米伦断层的西倾隐伏断层,断层最大滑动量为1.8 m,以左旋走滑为主兼具少量逆冲分量,断层破裂传播至米伦断层西侧,影响了苓顶断层和米伦断层的地震活动性。2021年花莲Mw6.0地震发生在苓顶断层北段,断层最大滑动量为0.38 m,断层滑动以左旋走滑为主,两次地震事件均具有高倾角滑动特征。综合两次地震静态库仑应力的重新分布和M-T图发现,2018年花莲地震对2021年地震起触发作用,应力沿断层从高纬度向邻近低纬度传输累积,花莲地区及近海海域短周期内地震活动性仍强烈,主要表现为小震频发、中强震孕育周期短等特点。
|
| 关 键 词： | 花莲地震 InSAR同震形变 断层滑动 库伦应力 |
| 收稿时间： | 2021-10-09 |
Observation of faulting slip of Hualian earthquake in Taiwan and kinematic mechanism analysis |
| |
| LIANG Bin,WEI Guanjun.Observation of faulting slip of Hualian earthquake in Taiwan and kinematic mechanism analysis[J].Bulletin of Surveying and Mapping,2022,0(9):68-73. |
| |
| Authors: | LIANG Bin WEI Guanjun |
| |
| Institution: | 1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China;2. Nation-local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou 730070, China;3. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, China |
| |
| Abstract: | The ascending and descending Sentinel-1 SAR imageries are used to extract the co-seismic deformation field accused by 2018 Mw6.4 Hualian earthquake in Taiwan based on the D-InSAR method. The result shows that the maximum surface deformation is about 38.2 cm which belongs to uplift mainly, and the largest displacement difference between the hangingwall and the footwall is 50 cm. We construct the fault slip distribution models of the 2018 and 2021 Hualian earthquakes with the surface deformation obtained by the InSAR observation, and the results indicate that the fault of the 2018 Mw6.4 Hualian earthquake is a concealed west-dipping fault close to the Milun fault, the maximum is 1.8 m dominated by a left-lateral strike-slip movement with a small amount of thrust, the fault rupture propagate to the western erea of the Milun fault, which have an effect on seismicity of the Lingding fault and the Milun fault. The 2021 Hualian Mw6.0 earthquake occurred in the north of the Lingding fault, the maximum slip is 0.38 m a dominated by left-lateral strike-slip, both of two events have the high dip angle. With the redistribution of the static coulomb stress and the M-T diagram of two earthquakes,we find that the 2018 Hualian earthquake have triggered the 2021 Hualian earthquake,the stress transports and accumulats from high latitude to low latitude, the seismicity between the Hualian aera and the offshore remains active in short period,present the characteristics that the small earthquakes occur frequently and birth period of medium-strong earthquakes are short. |
| |
| Keywords: | Hualian earthquake InSAR coseismic deformation fault slip coulomb stress |
|
| 点击此处可从《测绘通报》浏览原始摘要信息 |
| 点击此处可从《测绘通报》下载免费的PDF全文 |
|
