Semiannual velocity variations around the 2008 Mw 7.9 Wenchuan Earthquake fault zone revealed by ambient noise and ACROSS active source data     

Haichao Chen  ;Hongkui Ge  ;Fenglin Niu 《地震学报(英文版)》2014,(5):529-540

We continuously monitor the long-term seismic velocity variation of one of the major ruptured faults of the devastating 2008 Mw7.9 Wenchuan earthquake in China from July 2009 to January 2012,jointly using accurately controlled routinely operated signal system active source and seismic noise-based monitoring technique.Our measurements show that the temporal velocity change is not homogeneous and highly localized in the damaged fault zone and the adjacent areas.Velocity variations from the active and passive methods are quite consistent,which both are characterized by ±0.2 % seasonal variation,with peak and trough at winter and summer,respectively.The periodic velocity variation within fault zone exhibits remarkably positive correlation with barometric pressure with stress sensitivity in the order of 10-6Pa-1,suggesting that the plausible mechanism might be the crack density variation of the shallow subsurface medium of the damaged fault zone in response to the cyclic barometric pressure loading.  相似文献   

精密控制机械震源在地下介质变化监测中的应用研究现状   总被引：2，自引：0，他引：2  

杨微  王宝善  葛洪魁  袁松湧  贾玉华  段家杨 《地震研究》2015,38(1)

阐述了精密控制机械震源(ACROSS)的工作原理、发展历程、工作模式及信号检测等,介绍了国际上利用ACROSS开展观测实验的研究现状,并针对地震危险区域,提出可利用ACROSS进行地下精细结构探测及其动态变化监测研究,增强孕震环境和发震机理的认识水平,为地震物理预报研究提供了一种潜在的技术途径。  相似文献   

Initial Experimental Result of Accurately Controlled Routinely Operated Signal System （ACROSS）     

Liao Chengwang  Zhuang Cantao  Liang Hongsen 《中国地震研究》2003,17(3):265-273

The principle of Accurately Controlled Routinely Operated Signal System (ACROSS) is introduced in this paper, A sample machine is made and tested. The experiment shows that the signal-stacking technique is effective in improving signal-to-noise ratio and the sompi cepstrum method is applicable to deconvolute a set of travel times of wave elements from accurate transfer function data in frequency domain.  相似文献   

精密可控常时震源系统(ACROSS)的初步实验   总被引：4，自引：1，他引：4  

廖成旺  庄灿涛  梁鸿森 《中国地震》2003,19(1):89-96

地震是重大自然灾害之一 ,长期以来 ,人们不断地发展各种地震观测手段 ,探索地震预报之路。精密可控常时震源系统ＡＣＲＯＳＳ(ＡｃｃｕｒａｔｅｌｙＣｏｎｔｒｏｌｌｅｄＲｏｕｔｉｎｅｌｙＯｐｅｒａｔｅｄＳｉｇｎａｌＳｙｓ ｔｅｍ)是国际上 2 0世纪 90年代以来发展起来的一种新型可控震源技术。目的是通过产生精密可控的地震波和采用先进的观测与处理技术监测地震发生区域地层物理状态的微小变化。ＡＣＲＯＳＳ震源与通常的爆破震源相比 ,有如下主要特点 :( 1 )ＡＣＲＯＳＳ震源产生的是单一弹性波 ,从能量的角度讲 ,机械波的能量效率…  相似文献   

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杨光亮  朱元清 《大地测量与地球动力学》2007,27(5):72-75

????????????????????е???????????????????????????????????????ACROSS?????????????????????о????,????????????????????????????????????????????????????????????????????????????  相似文献