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皎口水库地震精定位、震源机制及发震机理探讨

张蓓蕾 彭骁

张蓓蕾, 彭骁. 皎口水库地震精定位、震源机制及发震机理探讨[J]. 地震科学进展, 2023, (3): 97-107. doi: 10.19987/j.dzkxjz.2022-110
引用本文: 张蓓蕾, 彭骁. 皎口水库地震精定位、震源机制及发震机理探讨[J]. 地震科学进展, 2023, (3): 97-107. doi: 10.19987/j.dzkxjz.2022-110
Zhang Beilei, Peng Xiao. Discussion on precise location, focal mechanism and seismogenic mechanism of Jiaokou reservoir earthquakes[J]. Progress in Earthquake Sciences, 2023, (3): 97-107. doi: 10.19987/j.dzkxjz.2022-110
Citation: Zhang Beilei, Peng Xiao. Discussion on precise location, focal mechanism and seismogenic mechanism of Jiaokou reservoir earthquakes[J]. Progress in Earthquake Sciences, 2023, (3): 97-107. doi: 10.19987/j.dzkxjz.2022-110

皎口水库地震精定位、震源机制及发震机理探讨

doi: 10.19987/j.dzkxjz.2022-110
详细信息
    通讯作者:

    张蓓蕾(1981-),女,工程师,主要从事基层地震监测及应急工作。E-mail:147652571@qq.com

  • 中图分类号: P315.3+3

Discussion on precise location, focal mechanism and seismogenic mechanism of Jiaokou reservoir earthquakes

  • 摘要: 利用双差定位法对宁波皎口水库2009—2021年地震进行重新定位,通过HASH方法计算了较大地震的震源机制解,基于精确定位后的地震震源位置分布、深度分布以及总体震源机制解特征,结合区域地质构造背景、库区地质条件以及水库水位变化,对发震构造及孕震机理进行探讨。结果表明,皎口水库2009—2012年地震序列与2018—2021年地震序列孕震机理相似,区域性断裂长兴—奉化可能为发震断层;库水通过断裂破碎带下渗,孔隙水压力扩散及库水对岩石的软化弱化长时间作用,造成断层面及其深部某些薄弱部位变为不稳定区域,最后在库水变化导致的加卸荷应力场作用下触发地震。

     

  • 图  1  区域地层及地质构造图

    Figure  1.  Regional strata and geological structure map

    图  2  皎口水库地震序列震中分布图

    Figure  2.  Epicenter distribution map of Jiaokou reservoir earthquake sequence

    图  3  重新定位所用台站分布图

    Figure  3.  Distribution map of stations used for relocation

    图  4  2009—2021年皎口水库地震序列原始(a) 及重新定位后(b) 震中分布图

    Figure  4.  Epicenter distribution map of the original (a) and relocated (b) of Jiaokou reservoir earthquake sequence from 2009 to 2021

    图  5  2009—2021年皎口水库地震震源深度分布图(投影到剖面AA′)

    Figure  5.  Focal depth distribution of Jiaokou reservoir earthquake sequence from 2009 to 2021 (projected to section AA′)

    图  6  皎口水库2018—2021年地震序列精确定位后的地震分布在水平面(a)、断层面(b)、垂直于断层面的横断面上(c)的投影、以及地震距断层面距离的分布(d)。圆圈表示精确定位后的地震,粗线表示确定的断层面边界,AA′为断层上边界端点

    Figure  6.  The earthquakes accurately located in the 2018—2021 Jiaokou reservoir earthquake sequence are distributed on the projection of the horizontal plane (a), the projection of the fault plane (b), the projection of the cross-section perpendicular to the fault plane (c), and the distribution of the distance between the earthquakes and the fault plane (d). The circles indicate the accurately located earthquakes. The thick line indicates the determined boundary of the fault plane. AA′ is the endpoint of the upper boundary of the fault

    图  7  皎口水库地震序列较大地震震源机制解

    Figure  7.  Focal mechanism solutions of the larger earthquakes in Jiaokou reservoir earthquake sequence

    图  8  2009—2021年皎口水库地震总体震源机制解

    Figure  8.  Overall focal mechanism solution of Jiaokou reservoir earthquake sequence from 2009 to 2021

    图  9  2009—2021年皎口水库逐日水位(a) 、水位日变化量(b) 与地震活动对比图

    Figure  9.  Comparison diagram of daily water level (a)、daily variation of water level (b) and seismic activities of Jiaokou reservoir from 2009 to 2021

    表  1  皎口水库大坝基坑开挖发现的断层(贯穿坝基上下游)

    Table  1.   Faults founded in the foundation pit excavation of Jiaokou reservoir dam (running through the upstream and downstream of the dam foundation)

    编号产状特征力学性质
    走向倾向倾角
    N60°—80°W SW 65°—80° 破碎带发育,夹少量断层角砾及褐色断层泥 张性
    N30°—35°W NE 67°—80° 破碎带局部有少量断层泥及铁镁稀浆(其中见有巨大的断层角砾) 张性
    N75°—85°W NE 55°—70° 破碎带夹少量的断层泥及断层角砾岩 扭性
    下载: 导出CSV

    表  2  速度模型

    Table  2.   Velocity model

    序号深度/kmP波速度/(km•s−1
    105.40
    255.80
    3105.93
    4206.20
    5306.80
    下载: 导出CSV

    表  3  皎口水库地震序列较大地震震源机制解

    Table  3.   Focal mechanism solutions of the larger earthquakes in Jiaokou reservoir earthquake sequence


    发震时间
    年-月-日 时:分

    节面Ⅰ 节面Ⅱ P T B
    备注
    走向
    倾角
    滑动角
    走向
    倾角
    滑动角
    方位
    倾角
    方位
    倾角
    方位
    倾角
    11993-02-26 12:123.92918433 1975717360181592730057SS
    21993-03-04 06:593.48176213467016521243042511365SS
    31994-09-07 14:324.719553−1649577−3848361501626050SS
    42009-09-10 20:213.11107516220573161582672325167SS
    52009-09-12 06:402.91017316919479173274582022570SS
    62009-09-12 08:213.32908914621561341232402410956SS
    72009-09-12 20:032.712065−1612273−263393072517159SS
    82009-09-24 11:083.012057−135154−4333354240214936NS
    92009-10-09 05:343.31208615121261517017722329361SS
    102010-01-07 14:472.628883−15319463−815424581330162SS
    112019-05-16 17:132.49152164191773931616583620649SS
    122019-05-22 04:012.410558172199833232817672721057SS
    132019-05-25 14:482.211141−13334261−5930061501114627N
    142019-05-28 10:443.611068−144527−2733141235713749NS
    152019-05-28 11:472.227584157867732312229208166SS
    162019-05-28 16:523.311982−1442351−10348332452012950SS
    172019-05-29 13:171.928283−10516817−2517650253628415NS初动、振幅
    182019-05-29 19:033.49940−173486−5030837622918040SS初动、振幅
    192020-11-05 20:033.012882−1373148−11359352522213646SS
    202020-11-11 01:041.39279−10733020−3434253196329517NS
    212020-12-18 12:213.130254−16720480−3715733258171152SS
    222020-12-18 13:031.818979−1015516−4685552883319111N初动、振幅
    232020-12-20 05:291.632419−8914371−905264233261430N
    242020-12-20 00:192.512360−1642576−3134031771118356SS初动、振幅
    252020-12-20 10:291.410566−8527324−1012569191212835N
    262021-02-21 02:121.011382−10635718−275502173511516NS
    272021-01-19 06:251.82148814130651326725162283251SS
    282021-08-26 11:322.617920−5632374−10221760622832711N
    下载: 导出CSV
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  • 收稿日期:  2022-07-11
  • 录用日期:  2022-10-13
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