Volcanic Earthquakes and Tremor at Kilauea Volcano : Source Mechanisim in Relation to Volcano Structure Eruptive Processes

基拉韦厄火山的火山地震和震颤:与火山结构喷发过程相关的震源机制

基本信息

批准号：
08041098
负责人：
IDA Yoshiaki
金额：
$ 5.18万
依托单位：
The 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：
1996
资助国家：
日本
起止时间：
1996 至无数据
项目状态：
已结题

项目摘要

The cooperative experiment with U. S. volcanologists was conducted around the summit area of Kilauea volcano, Hawaii. Over a five day period three seismic antennas, three temporary broadband stations added to the seven permanent broadband stations, and a 120-component seismic reflection line were installed. During the experiment, Kilauea Volcano was undergoing an unusual period of seismic activity associated with a protracted transient in 10-year-long Puu Oo eruption. Analyzing the data of this experiment, some features of the seismic events are clarified as are summarized below.The crustal deformation accompanied with the very-long period pulses was observed. Particle motion plots for the pulses indicate that the source of these signals originated near the north rim of the summit crater. Since the crustal deformation is thought to be caused by the magma activities just blow the crater, the very-long-seismic signals may be related to the magma activities. The source mechanism of the crustal deformation and the seismic pulses will be clarified by the detailed analysis of the data newly obtained by the broadband stations.During the experiment, many volcanic earthquakes were observed. Frequency-slowness array analyses of volcanic signals by way of MUSIC method present that the signals came from the summit crater. Precise analyses of the data with the seismic antennas will show the detailed nature of the waveforms of the seismic events and the underground structure below the summit area.

与美国火山学家的合作实验是在夏威夷基拉韦阿火山的山顶地区进行的。在五天的时间内，安装了三个地震天线，在七个永久宽带站中添加了三个临时宽带站，并安装了120组成分的地震反射线。在实验过程中，基拉韦阿火山正在经历与长达10年的PUU OO爆发中旷日持久的瞬态相关的地震活性时期。分析该实验的数据，如下所示，阐明了地震事件的某些特征。观察到与很长的时期脉冲伴随着地壳变形。脉冲的粒子运动图表明，这些信号的来源起源于山顶火山口的北边缘附近。由于地壳变形被认为是由岩浆活动引起的，这只是吹火山口，因此非常长的声学信号可能与岩浆活动有关。地壳变形和地震脉冲的源机制将通过对宽带站新获得的数据的详细分析来阐明。在实验中，观察到许多火山地震。通过音乐方法对火山信号的频率延迟阵列分析，表明这些信号来自山顶火山口。使用地震天线对数据进行的精确分析将显示地震事件波形的详细性质和峰顶区域下方的地下结构的详细性质。