芦山地震前的重力扰动  

The gravity disturbance signals before Lushan earthquake

作　　者：王新胜[1,2,3] 贾路路 韩宇飞 李强 

机构地区：[1]地壳运动监测工程研究中心,北京100045 [2]中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,湖北武汉430077 [3]中国科学院地质与地球物理研究所地球深部研究重点实验室,北京100029

出　　处：《地学前缘》2013年第6期80-84,共5页Earth Science Frontiers

基　　金：国家自然科学基金项目(41304057;41204013);大地测量与地球动力学国家重点实验室开放基金项目(SKLGED2013-3-5-E);中国科学院地球深部研究重点实验室开放基金项目

摘　　要：继2008年汶川8.0级大地震＂突然＂发生后,2013年4月20日芦山7.0地震的＂突然＂发生,再一次表明大地震短临监测的重要性和迫切性。芦山地震后,对中国大陆构造环境监测网络（简称＂陆态网络＂）连续重力台站的重力观测资料进行了处理分析,首次发现震前存在两种不同性质的重力扰动信号,周期分别为8~11s和6~8s。其中,周期为8~11s的重力扰动信号从大震前1天开始逐渐增大,并于震中距大于1 570km时消失;周期为6~8s的重力扰动信号从大震前7天开始逐渐增大,能够被所有台站监测到。两种重力扰动信号可能反映了芦山地震孕震过程的两个不同阶段,对进一步揭示芦山地震孕震机制具有重要的参考意义。The‘accidental＇occurrence of Lushan 7.0earthquake on April 20,2013following the‘accidental＇occurrence of 2008 Wenchuan earthquake,indicated the importance and urgency of strengthening impending earthquake monitoring once again. We processed and analyzed the gravity data of Crustal Movement Observation Network of China（CMONOC）after Lushan earthquake and,for the first time,found two different gravity disturbance signals with period of 8-11seconds and of 6-8seconds respectively before the earthquake.The former gravity disturbance signal increased for one day before the earthquake happening,while the latter signal increased for seven days before the earthquake happening.Moreover,the former signal cannot be monitored when the epicentral distance exceeds 1570km,while the latter signal can be observed by any gravity station.The two different gravity disturbance signals may indicate two different stages of Lushan earthquake seismogenic process,and are significant for the further revelation of Lushan earthquake seismogenic mechanism.

关 键 词：芦山地震 震前重力扰动 孕震机制 陆态网络 

分 类 号：P315.726[天文地球—地震学]