| 芦山7级地震的同震位移估计和震源滑动模型反演尝试 |
| |
| 引用本文： | 金明培,汪荣江,屠泓为.芦山7级地震的同震位移估计和震源滑动模型反演尝试[J].地球物理学报,2014,57(1):129-137. |
| |
| 作者姓名： | 金明培 汪荣江 屠泓为 |
| |
| 作者单位： | 1. 中国地震局滇西地震预报实验场办公室, 云南大理 671000;
2. 德国地球科学研究中心(GFZ), 波茨坦 14473, 德国;
3. 青海省地震局, 西宁 810001 |
| |
| 基金项目： | 地震科技青年骨干人才培养项目（国家留学基金委20105007）资助. |
| |
| 摘 要： | 利用自动经验基线校正方法，分析2013年4月20日芦山MS7.0级地震13个近场强震动台的观测资料，以估算同震位移场分布，并据此反演了震源滑动模型.经与GPS结果比较，两种不同方法给出的芦山7级地震的水平近场同震位移场幅度都不超过cm级，均显示为典型的逆冲型地震（兼有少量左旋走滑错动）.强震最大水平和垂直永久位移分别为4.9 cm和4.4 cm，分别出现在51YAM台和51QLY 台.两种资料反演的震源滑动模型虽显示多事件特征，但主要滑动均集中在第一次事件，即初始滑动点两侧的走向长约30 km、倾向长约25 km的相对集中的较小范围内，强震和GPS模型的最大滑动量分别为1.14 m和1.09 m，较为一致.其余子事件滑动量小且分布零散，不能排除其数值效应的因素.反演矩震级均在Mw6.7左右，地表破裂应该不明显.文章还讨论了目前在我国利用近场强震动记录估计Mw6~7级地震同震位移场存在的困难和问题，为今后类似工作提供参考.
|
| 关 键 词： | 近场强震 经验基线校正 同震位移 滑动模型 2013年4月20日芦山MS7.0级地震 |
| 收稿时间： | 2013-07-04 |
Slip model and co-seismic displacement field derived from near-source strong motion records of the Lushan MS7.0 earthquake on 20 April 2013 |
| |
| JIN Ming-Pei,WANG Rong-Jiang,TU Hong-Wei.Slip model and co-seismic displacement field derived from near-source strong motion records of the Lushan MS7.0 earthquake on 20 April 2013[J].Chinese Journal of Geophysics,2014,57(1):129-137. |
| |
| Authors: | JIN Ming-Pei WANG Rong-Jiang TU Hong-Wei |
| |
| Institution: | 1. Office of the Western Yunnan Earthquake Prediction Study Area, China Earthquake Administration, Dali Yunnan 671000, China;
2. GFZ German Research Centre for Geosciences, Potsdam 14473, Germany;
3. Earthquake Administration of Qinghai Province, Xining 810001, China |
| |
| Abstract: | Near-source co-seismic displacement field of the 20 April 2013 MS7.0 Lushan, Sichuan earthquake is estimated from digital strong-motion records after correction for their baseline errors using an improved empirical method and compared with the GPS observations. Furthermore, different slip models of the earthquake are inverted from the GPS and strong-motion based displacement data separately and jointly, which are in good agreement. Both show that the earthquake is dominated by the thrust mechanism(also a few left-lateral dislocations). The maximum horizontal and vertical co-seismic displacements reached 4.9 cm and 4.4 cm, and occurred at stations 51YAM and 51QLY, respectively. The fault slips are mainly distributed around the first event and in an area of about 30 km along the strike and 25 km along the dip. The moment magnitude is estimated to be Mw6.7, and the peak slip is about 1.14 m from strong motion data and 1.09 m from GPS data. The surface rupture should be very small. Finally, we discuss the minimum requirements on the strong-motion data that ensure a reliable recovery of the co-seismic displacement data and corresponding problems in the current strong-motion networks in China. |
| |
| Keywords: | Near-source strong motion Empirical baseline correction Co-seismic displacement Slip model The 20 April 2013 MS7 0 Lushan Sichuan earthquake |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
