| Enhancement of Seismicity Recorded by the Qiaojia Array before the 2013 Lushan and 2014 Ludian Earthquakes |
| |
| 作者姓名： | Li Yan'e Chen Lijuan Chen Xuezhong |
| |
| 作者单位： | Institute of Geophysics, CEA, Beijing 100081, China,Earthquake Administration of Chongqing Municipality, Chongqing 401147, China,Institute of Geophysics, CEA, Beijing 100081, China |
| |
| 基金项目： | This paper was funded by the operational object of China Earthquake Science Experiment. |
| |
| 摘 要： | A seismic array of twenty four seismometers(Qiaojia array) operated by the Institute of Geophysics,China Earthquake Administration was situated along the Zemuhe fault and the north end of Xiaojiang fault,which is a part of the east boundary of the Chuan-Dian( Sichuan-Yunnan) rhombus crustal mass. The Qiaojia array started operation at the end of February,2012. Since then the April 20,2013 Lushan MS7. 0 earthquake and the August 3,2014 Ludian MS6. 5 earthquake have occurred in the vicinity of the Qiaojia array. The earthquake catalogue recorded by the Qiaojia array since March,2012 is used in this study. The temporal variation of the earthquake count before the Lushan event and the Ludian event is analyzed. The results are as follows:(1) A very clear gradually increasing variation of the count of M ≥ 2. 0 earthquakes within the region,where all earthquakes recorded by the Qiaojia array coverage can be found before the Lushan event and the Ludian event,and the increasing range and duration of the count before the Ludian event are both larger than those before the Lushan event.(2) In the region covered by the Qiaojia array,for earthquakes with depth h ≤10 km a rising process of the count was manifested before both events,along with a nearly same duration of about five and a half months,and for earthquakes with depths h 10 km a rising-dropping process of the count was manifest before the Lushan event,before which the rising-dropping process appeared again. The variation of the count for earthquakes with depth h ≤ 10 km is the reverse of that for earthquakes with depth h 10 km.(3) Within and near the region covered by the Qiaojia array,the variation of the count manifests a rising process for earthquakes with depth h ≤ 10 km or h 10 km before the Lushan event and only for earthquakes with depth h ≤ 10 km before the Ludian event. The variation of the count manifests a weakening process for earthquakes with depth h 10 km before the Lushan event. It is shown from the above results that the seismicity within and near the regioncovered by the Qiaojia array showed a steeply rising change before both the Lushan event and the Ludian event. This phenomenon could be revelatory to understanding the process of seismicity development.
|
| 关 键 词： | Seismicity The 2013 Lushan earthquake The 2014 Ludian earthquake The Qiaojia array |
| 收稿时间： | 2016/12/14 0:00:00 |
| 修稿时间： | 2017/2/10 0:00:00 |
Enhancement of Seismicity Recorded by the Qiaojia Array before the 2013 Lushan and 2014 Ludian Earthquakes |
| |
| Li Yan''e,Chen Lijuan,Chen Xuezhong.Enhancement of Seismicity Recorded by the Qiaojia Array before the 2013 Lushan and 2014 Ludian Earthquakes[J].Earthquake Research in China,2017,31(4):560-573. |
| |
| Authors: | Li Yan'e Chen Lijuan and Chen Xuezhong |
| |
| Institution: | Institute of Geophysics, CEA, Beijing 100081, China,Earthquake Administration of Chongqing Municipality, Chongqing 401147, China and Institute of Geophysics, CEA, Beijing 100081, China |
| |
| Abstract: | |
| |
| Keywords: | Seismicity The 2013 Lushan earthquake The 2014 Ludian earthquake The Qiaojia array |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国地震研究》浏览原始摘要信息 |
| 点击此处可从《中国地震研究》下载免费的PDF全文 |
|
