Monitoring of the volcanic fluid system and elucidation of the deep-magma ascent mechanism at Aso volcano

阿苏火山火山流体系统监测及深部岩浆上升机制阐明

• 批准号: 15204040
• 负责人: KAWAKATSU Hitoshi
• 金额: $ 26.79万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15204040/
• 关键词: Aso volcano; broadband seismometer; volcanic tremor; lone-period tremor; volcanic eruption; magma ascent; GPS; array seismometry; 広帯域地震

In order to monitor the volcanic fluid system and to elucidate the mechanism of magma ascent before eruptions, we deployed broadband seismometer and GPS networks in Aso volcano. We also conducted a series of dense array observations to monitor shallow fluid flow activities. As the result, (l) we were successful to observe extremely fast fluid movements in the shallow part of the volcano that appear to indicate a well developed shallow conduit system, (2) we have presented a model that explains the activities of long-period (15s) and short-period (1s) tremors as a result of the activities of a single conduit system of hydrothermal fluid flows. We have also developed an efficient method to compute the dynamic response of a fluid-filled crack that is flexible to many applications which may be encountered in volcano seismology.

为了监测火山流体系统，阐明火山喷发前岩浆上升的机制，我们在阿索火山部署了宽带地震仪和GPS网络。我们还进行了一系列密集阵列观测，以监测浅层流体流动活动。结果，（1）我们成功地观察到非常快的流体运动在浅部的火山，似乎表明一个发育良好的浅管道系统，（2）我们已经提出了一个模型，解释活动的长周期（15秒）和短周期（1秒）的震颤作为一个单一的热液流体流管道系统的活动的结果。我们还开发了一种有效的方法来计算充满流体的裂纹的动态响应，这是灵活的许多应用中可能会遇到火山地震。

项目成果

Dynamic response of frequent tremors at Aso volcano to teleseismic waves from the 1999 Chi-Chi, Taiwan earthquake

• DOI: 10.1016/j.jvolgeores.2005.03.012
• 发表时间: 2005-10
• 期刊: Journal of Volcanology and Geothermal Research
• 影响因子: 2.9
• 作者: M. Miyazawa;I. Nakanishi;Y. Sudo;T. Ohkura

A new technique of radiation thermometry using a consumer digital camcorder : Observations of red glow at Aso volcano, Japan

使用消费数码摄像机进行辐射测温的新技术：日本阿苏火山红光的观测

• 发表时间: 2005
• 期刊: Earth Planets Space 57・2
• 作者: N.Ozaki;T.Ono;K.Kondo et al.;T.Saito 他
• 通讯作者: T.Saito 他

Apparent migration of tremor source synchronized with the change in the tremor amplitude observed at Aso Volcano, Japan

日本阿苏火山震源明显迁移与震幅变化同步

• 发表时间: 2006
• 期刊: J.Volcanology Geothermal Research (in press)
• 作者: Ji-Cheng Shao;Yozo Hamano;Michael Bevis;N.Takagi 他
• 通讯作者: N.Takagi 他

Apparent migration of tremor sources synchronized with the changes in the tremor amplitude observed at Aso volcano, Japan

日本阿苏火山观测到的与震颤幅度变化同步的震源表观迁移

• 发表时间: 2006
• 期刊: J. Vol. Geothermal Res 154
• 作者: N. Takagi;et. al.
• 通讯作者: et. al.

Numerical simulation of the steam-water flow instability as a mechanism of long period ground vibrations at geothermal areas

地热区长周期地面振动机制中汽水流不稳定性的数值模拟

• 发表时间: 2005
• 期刊: Geophys.J.Int. 162
• 作者: S.Sasaki;S.Tarucha;K.Iwamura and S.Kaneshima
• 通讯作者: K.Iwamura and S.Kaneshima