基于改进的STA/LTA方法的微地震P波自动拾取技术  

Automatic Picking of Microseismic Events P-wave Arrivals Based on Improved Method of STA/LTA

作　　者：刘晓明[1,2] 赵君杰[1,2] 王运敏[3] 彭平安[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]金属矿山安全与健康国家重点实验室,安徽马鞍山243004 [3]中钢集团马鞍山矿山研究院有限公司,安徽马鞍山243004

出　　处：《东北大学学报（自然科学版）》2017年第5期740-745,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51604301;51374242);金属矿山安全与健康国家重点实验室开发基金资助项目(2015-JSKSSYS-01);中央高校基本科研业务费专项资金资助项目(2015zzts073)

摘　　要：基于STA/LTA方法,提出了一种改进的自动拾取P波到时算法.引入权重因子K,构建了一种新的特征函数,提出寻找STA/LTA曲线上的最大值对应时刻为P波到时的方法,并运用Matlab对冬瓜山铜矿微震事件进行初至拾取分析.结果表明:该方法能够准确地拾取微地震P波初至,减少了传统的STA/LTA算法需要调整触发阈值(Thr)的过程,克服了固定阈值不能适应复杂多变信号到时拾取的缺点,具有抗噪性强、稳定性强、拾取精确度高等优势.An improved method of automatic picking P-wave first arrival time based on the method of STA/LTA was put forward. A new kind of characteristic function was established by introducing weighting factor K, the global maximum on the curve of STA/LTA was found, then the corresponding moment is identified as the arrival of P-wave, and Matlab was used to analyze seismic events. Results show that the method can accurately pick up P-wave arrivals of seismic event, and reduce the process of adjusting the trigger threshold (Thr) to pick up the P-wave of the traditional algorithm (STA/LTA), and overcome the shortcoming that a fixed threshold can not pick the arrival time of complex signals. And the method has advantages of strong noise resistance, good stability, etc. © 2017, Editorial Department of Journal of Northeastern University. All right reserved.

关 键 词：微震监测 P波初至自动拾取 STA/LTA方法 MATLAB 

分 类 号：P315[天文地球—地震学]