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基于向量扫描法的微地震震级确定方法

冯彦军 梁北援

冯彦军, 梁北援. 基于向量扫描法的微地震震级确定方法[J]. 地震科学进展, 2023, (3): 115-119. doi: 10.19987/j.dzkxjz.2022-072
引用本文: 冯彦军, 梁北援. 基于向量扫描法的微地震震级确定方法[J]. 地震科学进展, 2023, (3): 115-119. doi: 10.19987/j.dzkxjz.2022-072
Feng Yanjun, Liang Beiyuan. A method to estimate the microseismic magnitude based on vector scanning[J]. Progress in Earthquake Sciences, 2023, (3): 115-119. doi: 10.19987/j.dzkxjz.2022-072
Citation: Feng Yanjun, Liang Beiyuan. A method to estimate the microseismic magnitude based on vector scanning[J]. Progress in Earthquake Sciences, 2023, (3): 115-119. doi: 10.19987/j.dzkxjz.2022-072

基于向量扫描法的微地震震级确定方法

doi: 10.19987/j.dzkxjz.2022-072
详细信息
    作者简介:

    冯彦军(1980–),副研究员,主要从事煤矿井下煤岩体水力压裂技术研究及应用。E-mail:fengyjchn@gmail.com

    通讯作者:

    梁北援(1952–),GeoImage LLC技术总监,主要从事微地震监测的理论和方法的研究。E-mail:bjjywd@126.com

  • 中图分类号: P315.3

A method to estimate the microseismic magnitude based on vector scanning

  • 摘要: 对地震记录中显著可视事件震级的确定,已有如里氏震级、矩震级、不同定义的震级之间的关联、震级与能量之间的关系等成熟方法。然而,由于微地震事件记录常淹没在背景噪声中,无法实施包括确定震级在内的传统定位。为比较不同类型不同地域的微震大小、研究微震机制及诱发原因、使用其安全预警等,我们外延里氏震级到微震范畴,定义了等效里氏微震震级:根据微破裂向量扫描输出的无量纲能量或最小信噪比,估计一定时空中单位时间单位台站所接收的在时空目标一点上的等效能量和震级。文中列出了目前我们在微震监测中发现的几类微震的大小规模。

     

  • 表  1  基于公式(7)的能量E与震级MM=[−3, 3])的数值关系

    Table  1.   Numerical relationship between energy E and magnitude M in a range of [−3, 3] based on formula (7)

    震级能量/JE/E0相应参考
    3.0 2 000 000 000 31 700
    2.5 350 000 000 5 560
    2.0 63 000 000 1 000 数千米内,人有感
    1.5 11 000 000 175
    1.0 2 000 000 31.7
    0.5 350 000 5.56
    0.0 63 000 1.00 数千米内,检波器显著有感
    −0.5 11 000 0.175 步枪
    −1.0 2 000 0.031 7
    −1.5 350 0.005 56 手枪
    −2.0 63 0.001 00
    −2.5 11 0.000 175 气枪
    −3.0 2 0.000 031 7
    注:E0M=0的能量。此表的最右一列也参考了文献[9]和[11]
    下载: 导出CSV

    表  2  由式(7)和平均能量得到的几种不同类别的微震等效能级平均震级

    Table  2.   Equivalent Richter magnitudes of some available microseismic styles from formula (7) and average energy

    微震类别平均
    能量/J
    等效里氏震级
    最小最大平均
    煤矿采空区垮塌诱发 2 670 −3.3 −0.2 −0.9
    煤矿采空区垮塌诱发
    (顶板几十米岩体事先压裂过)
    1 380 −2.7 0.1 −1.1
    油井注热水预处理 18 −2.1 −1.5 −1.8
    煤矿顶板压裂 13 −3.2 −1.8 −2.5
    油井压裂 10 −3.7 −1.8 −2.8
    下载: 导出CSV
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  • 收稿日期:  2022-05-04
  • 录用日期:  2022-07-07
  • 网络出版日期:  2022-10-13

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