High‐precision relocation of long‐period events beneath the summit region of Kı̄lauea Volcano, Hawai‘i, from 1986 to 2009
High‐precision relocation of long‐period events beneath the summit region of Kı̄lauea Volcano, Hawai‘i, from 1986 to 2009
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1986 年至 2009 年夏威夷基劳埃火山顶峰地区长期事件的高精度重定位
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
P. Okubo
中科院分区：
文献类型：
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作者：
R. Matoza;P. Shearer;P. Okubo
夏威夷Kı̄劳厄火山顶区数十年来一直记录到长周期(0.5-5赫兹，Lp)地震活动，并被认为与岩浆输运和浅层热液系统有关。为了更好地刻画其时空分布特征，我们对1986年1月至2009年3月在Kı̄劳埃亚峰顶地区发生的49,030次地震事件进行了系统分析，这些地震事件是由∼50站夏威夷火山观测站永久网络记录的。我们估计了215,437个P波谱，考虑了所有台站上的所有事件，并使用台站平均谱度量来一致地对LP和非LP地震活动进行分类。利用640万 事件对的波形互相关和聚类分析，结合震源特定台项方法，我们计算了5327个LP事件(占所有分类LP事件的43%)的高精度相对位置。大多数中等深度(5-15 Km)的LP塌陷成致密的体积，23年来具有显著的源位稳定性，表明源区过程受地质或管道构造控制。
Long‐period (0.5–5 Hz, LP) seismicity has been recorded for decades in the summit region of Kı̄lauea Volcano, Hawai‘i, and is postulated as linked with the magma transport and shallow hydrothermal systems. To better characterize its spatiotemporal occurrence, we perform a systematic analysis of 49,030 seismic events occurring in the Kı̄lauea summit region from January 1986 to March 2009 recorded by the ∼50‐station Hawaiian Volcano Observatory permanent network. We estimate 215,437 P wave spectra, considering all events on all stations, and use a station‐averaged spectral metric to consistently classify LP and non‐LP seismicity. We compute high‐precision relative relocations for 5327 LP events (43% of all classified LP events) using waveform cross correlation and cluster analysis with 6.4 million event pairs, combined with the source‐specific station term method. The majority of intermediate‐depth (5–15 km) LPs collapse to a compact volume, with remarkable source location stability over 23 years indicating a source process controlled by geological or conduit structure.