Research on the Initial Arrival Recognition and Judgment Method of Microseismic Signals Based on PELT

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Xulin Wang, Minghui Lv
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引用次数: 0

Abstract

In microseismic monitoring, accurately identifying the arrival time of the P-wave initial arrival is crucial for the precise location and analysis of microseismic sources. However, due to the typically low energy of microseismic signals and poor signal-to-noise ratio (SNR), existing first-arrival picking algorithms struggle with the accuracy of picking results when dealing with microseismic data of low SNR, as they are greatly affected by strong background noise. To address this issue, this study proposes a new initial arrival identification method, which first employs variational mode decomposition (VMD) and the sample entropy method for denoising microseismic data with a low SNR, and then utilizes the pruned exact linear time (PELT) algorithm to determine the time of the microseismic initial arrival. Compared with the traditional short-term average and long-term average ratio (STA/LTA) algorithm and the Akaike information criterion (AIC) method, the method proposed in this paper demonstrates significant advantages in terms of picking precision and noise resistance.

Abstract Image

基于 PELT 的微震信号初至识别与判断方法研究
在微地震监测中,准确识别 P 波初至波的到达时间对于精确定位和分析微震源至关重要。然而,由于微地震信号的能量通常较低,信噪比(SNR)较差,在处理信噪比较低的微地震数据时,现有的初至拾取算法受强背景噪声的影响较大,难以保证拾取结果的准确性。针对这一问题,本研究提出了一种新的初至识别方法,该方法首先采用变模分解(VMD)和样本熵法对低信噪比的微震数据进行去噪,然后利用剪枝精确线性时间(PELT)算法确定微震初至时间。与传统的短期平均和长期平均比率(STA/LTA)算法和阿凯克信息准则(AIC)方法相比,本文提出的方法在拾取精度和抗噪性方面具有显著优势。
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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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