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首页> 外文期刊>Geophysical Research Letters >Monochromatic infrasonic tremor driven by persistent degassing and convection at Villarrica Volcano, Chile
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Monochromatic infrasonic tremor driven by persistent degassing and convection at Villarrica Volcano, Chile

机译:智利比利亚里卡火山持续脱气和对流驱动的单色次声震颤

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摘要

Infrasonic data collected at Villarrica volcano (Chile) in March 2009 show a sustained, continuous, infrasonic oscillation (tremor) with a monochromatic low frequency content at ~0.75 Hz. This tremor is extremely stable in time both at the summit and at a distal (~4 km) small aperture array. Infrasonic tremor is characterized by discrete high amplitude bursts with a cyclic recurrence time of ~40 s and is well correlated (0.93) with seismic tremor. These new data are compared with previous datasets collected in 2002 and 2004 during different levels of activity. All data show the same persistent infrasonic tremor and have the same strong correlation with seismic tremor. The stability and correlation of infrasonic and seismic tremor indicate the existence of a sustained and continuous process, which we suggest is related to the gravity-driven bubble column dynamics responsible for conduit convection.
机译:2009年3月在比利亚里卡火山(智利)收集的次声波数据显示持续,连续的次声波振荡(震颤),其低频成分约为0.75 Hz。无论是在山顶还是在远端(约4 km)小孔径阵列,这种震颤在时间上都非常稳定。次声震震的特征是离散的高振幅爆发,其循环复发时间约为40 s,并且与地震震震具有很好的相关性(0.93)。将这些新数据与2002年和2004年不同活动级别收集的以前的数据集进行比较。所有数据都显示出相同的持续性次声震颤,并且与地震震颤具有相同的强相关性。次声震和地震震的稳定性和相关性表明存在持续和连续的过程,我们建议这与负责导管对流的重力驱动气泡柱动力学有关。

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