夏威夷一维深部电性构造研究

梁萱, 唐新功, 余俊虎, 熊博

梁萱,唐新功,余俊虎,熊博. 2022. 夏威夷一维深部电性构造研究. 地震学报,44(3):467−475. DOI: 10.11939/jass.20210047
引用本文: 梁萱,唐新功,余俊虎,熊博. 2022. 夏威夷一维深部电性构造研究. 地震学报,44(3):467−475. DOI: 10.11939/jass.20210047
Liang X,Tang X G,Yu J H,Xiong B. 2022. Research on 1-D deep electrical structure in Hawaii. Acta Seismologica Sinica44(3):467−475. DOI: 10.11939/jass.20210047
Citation: Liang X,Tang X G,Yu J H,Xiong B. 2022. Research on 1-D deep electrical structure in Hawaii. Acta Seismologica Sinica44(3):467−475. DOI: 10.11939/jass.20210047

夏威夷一维深部电性构造研究

基金项目: 国家自然科学基金(41874119,41674107)和国家重点研发计划(2017YFB0202904)联合资助
详细信息
    作者简介:

    梁萱,硕士研究生,主要从事大地电磁方向研究,e-mail:812265964@qq.com

    通讯作者:

    唐新功,博士,教授,主要从事电磁法勘探与重磁勘探研究,e-mail:tangxingong@163.com

  • 中图分类号: P317.6;P319.2

Research on 1-D deep electrical structure in Hawaii

  • 摘要: 利用加拿大凤凰公司在夏威夷大岛地区布设的长期大地电磁观测台站,选取2018年5月至2019年4月的观测数据,反演并获得了该台站下方大岛深部的电性构造及其随时间变化的特征,并将反演结果与前人探测结果进行对比。研究结果表明:在观测点下方2—3 km处存在一个明显的低阻薄层,电阻率大约为20 Ω·m,推测其可能是地表浅部发育的岩浆囊;100 km深处电阻率变化范围在20—70 Ω·m,推测该深度下可能为活跃的复杂岩浆储层,反演结果与前人在邻近地区的探测结果具有可比性。
    Abstract: Volcanic activity is closely related to deep magma transportation and material melting state. Long-term dynamic monitoring of volcanoes is helpful to master their deep structure and variation characteristics, and provides important geophysical evidence for predicting volcanic eruptions and volcanic earthquakes. We selecte the observation data from May 2018 to April 2019 for inversion, and the data come from a long-term magnetotelluric observation station set up by Phoenix Company in the Big Island, Hawaii. We obtain the deep electrical structure below the observation point and its time-varying characteristics, and compare the inversion results with the previous exploration results. The research results show that there is an obvious thin low-resistance layer at a depth of 2−3 km below the observation point, and its resistivity is about 20 Ω·m. It is speculated that it may be a magma chamber developed in the shallow part of the Earth’s surface. The range of resistivity at the depth of 100 km is 20−70 Ω·m. It is speculated that there may be an active complex magma reservoir at this depth. The inversion results are comparable with the previous exploration results in neighboring areas.
  • 图  1   夏威夷岛的构造背景及测点位置

    Figure  1.   The tectonic background and distribution of the MT station of Hawaii Island

    图  2   2018年5月至2019年4月地震的震中位置

    Figure  2.   The epicenters of earthquakes from May 2018 to April 2019

    图  3   原始数据中视电阻率Rxy的质量

    日期最后一位字母A−X分别对应一天中的24时,下同

    Figure  3.   The quality of resistivity Rxy for the original data

    The last letters A-X of the date correspond to 24 hours in a day, the same below(a) 2018715M;(b) 2018715N;(c) 2018715O

    图  4   火山地震发生前后地下电性变化示意图

    图(b)−(d)线条上的短线为误差棒,误差棒的长短表示误差大小(a) 无地震发生;(b) 2018年5月3日;(c) 2018年5月4日;(d) 2018年6月8日

    Figure  4.   Schematic diagram of underground electrical changes before and after volcanic earthquakes

    The short line on the curves of Figs.(b)−(d) is error bar,and the length of the bar represents the error size(a) No earthquake;(b) May 3,2018;(c) May 4,2018;(d) June 8,2018

    图  5   2018年5月至2019年9月测点下方的电阻率变化示意图

    Figure  5.   Schematic diagram of resistivity change under the station from May 2018 to September 2019

    图  6   2018年4月至8月测点下方的电阻率变化示意图

    Figure  6.   Schematic diagram of resistivity change under the station from April to August,2018

    表  1   夏威夷岛部分较大震级的地震事件

    Table  1   Some earthquakes with large magnitude on Hawaii Island

    发震日期北纬/°西经/°深度/kmmb
    年-月-日时:分
    2018-05-0320:3019.34155.0765.1
    2018-05-0422:3219.31155.0026.9
    2018-06-0812:4419.41155.28−15.2
    2018-07-0211:2419.39155.27−15.3
    2019-03-1310:5519.33155.2075.5
    2019-04-1403:0919.47155.79135.3
    下载: 导出CSV
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  • 收稿日期:  2021-04-05
  • 修回日期:  2021-06-16
  • 网络出版日期:  2022-04-07
  • 发布日期:  2022-06-26

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