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利用背景噪声研究紫坪铺水库水位加卸载对库区地下介质波速的影响
安艳茹,张晓东
作者单位
安艳茹 中国地震局地震预测研究所, 北京市复兴路63号 100036 
张晓东 中国地震台网中心, 北京市西城区三里河南横街5号 100045 
摘要:
利用2005年1月1日~2008年1月1日紫坪铺台网及YZP台连续波形资料,通过噪声互相关技术研究了紫坪铺水库区域在蓄水、泄水过程中库区介质的变化特征,同时对可能的渗透过程进行了讨论。使用移动窗口互谱方法计算库区台站对之间的相对波速变化。结果表明,在紫坪铺水库的3次大规模蓄水及2次泄水过程中,地下介质相对波速变化与水位变化之间存在较为明显的相关性,并在时间上有一定延迟,可能与水的渗透有关。分析认为蓄水对浅层介质产生的作用最快,影响最大,波速的变化是蓄水产生的压力及渗透共同作用的结果。在第1次蓄水时,压力起主要作用,后2次蓄水时,渗透起主要作用,且渗透作用已影响至8km左右的断层。
关键词:  背景噪声  紫坪铺水库  水位  相对波速变化
DOI:
分类号:
基金项目:This project was sponsored by the Specific Fund of Fundamental Research, Institute of Geophysics, China Earthquake Administration (DQJB16B19).
Using Ambient Noise to Study the Seismic Velocity Changes Caused by the Rise and Fall of the Water Level in the Zipingpu Reservoir Region
An Yanru,Zhang Xiaodong
Abstract:
We study the feature of media changes beneath the Zipingpu reservoir and discuss the process of permeation with the water level rise and fall of the reservoir from January 2005 to January 2008 from ambient noise cross correlation by using continuous seismic data recorded by the stations of Zipingpu seismic network and YZP station. A moving-window cross-spectrum technique has been used to calculate the relative seismic velocity changes between station pairs. Results revealed an obvious relationship between relative seismic velocity, and the water level changes with a time delay that may be caused by permeation during three main impoundments and two large scale disemboguements. Impoundment generates a fast and large impact on the superficial layer, and the changes of seismic velocity is the result of increased pressure and permeation during the impoundment. At the first impoundment, the main effect factor is pressure. During the next two process of impoundment, permeation becomes the main effect factor, affecting the fault at a depth of about 8km.
Key words:  Ambient Noise  Zipingpu Reservoir  Water level  Relative seismic velocity changes