Volcanic Earthquakes and Tremor at Kilauea Volcano. Hawaii-Their Source Mechanisms

基拉韦厄火山的火山地震和震颤。

基本信息

批准号：
06041024
负责人：
IDA Yoshiaki
金额：
$ 8.58万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06041024/
关键词：
Hawaii Island Kilauea volcano Seismic observation Array observation Volcanic earthquake Volcanic tremor Long-period earthquake プ-オ-

项目摘要

We made an experiment during January 8,1996 to February 10 in the summit area of Kilauea volcano, Hawaii, which consisted of deployment of dense arrays of seismographs in three configurations which recorded simultaneously . All were arranged to optimally record earthquakes that occur beneath the summit caldera of Kilauea. The first array was a seismic antenna of 31 3-component instruments arranged in a semi-circle, with a spacing of about 50 m between arcs of stations. The collected signals from the antenna can be tuned to look at the passage of seismic waves across the network. The second component was an array of two circular rings, an inner ring of 8 3-component stations with a diameter of 2 km and an outer ring of 16 3-component stations with a diameter of 4 km, plus one station at the center. This configuration provided excellent azimuthal converage for events occurring near the center of the array. The third part of the array was a dense line of 48 mostly vertical instruments extending to the SSE from the center of the network. The spacing between these instruments was 35 m, chosen to assure wave coherence. This dense linear array was designed to study wave transmission as a function of distance.The principal goal of the experiment was to record volcanic tremor and volcanic earthquakes. The tremor signal was mostly weak during the recording period, except for a 4-hour long swarm on February 1. However, during the experiment hundreds of earthquakes were counted from the HVO network, with numerous earthquakes that occurred beneath other parts of Hawaii Island. Indeed, the data loggers recorded many earthquakes including several long-period volcanic earthquakes and tremor.

我们在1996年1月8日至2月10日在夏威夷基拉韦阿火山的山顶地区进行了一个实验，该实验包括三种同时记录的配置，包括密集阵列的密集地震仪。所有这些都被安排为最佳记录基拉韦阿山顶火山口下发生的地震。第一个阵列是在半圆形中排列的31个3组分仪器的地震天线，其间距在站的弧之间约50 m。可以调节来自天线的收集信号，以查看地震波跨网络的通道。第二个组件是两个圆形环的阵列，一个直径为2 km的8个3组分站的内环和直径为4 km的16个3组分站的外环，中心还有一个站。这种配置为在阵列中心附近发生的事件提供了出色的方位角。阵列的第三部分是一条密集的48条，主要是从网络中心延伸至SSE的垂直仪器。这些仪器之间的间距为35 m，以确保波相干性。该密集的线性阵列旨在研究波传输作为距离的函数。实验的主要目标是记录火山震颤和火山地震。在录制期间，震颤信号大多是弱的，除了2月1日长4小时长4小时。但是，在实验中，从HVO网络计算了数百次地震，在夏威夷岛其他地区发生了许多地震。实际上，数据记录仪记录了许多地震，包括几场长期的火山地震和震颤。