Seismo-acoustic characterisation of the 2018 Ambae (Manaro Voui) eruption, Vanuatu

Seismo-acoustic characterisation of the 2018 Ambae (Manaro Voui) eruption, Vanuatu
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2018 年瓦努阿图 Ambae(Manaro Voui)喷发的地震声学特征

DOI:
10.1007/s00445-021-01474-z
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发表时间:
2021
影响因子:
3.5
通讯作者:
Cevuard, Sandrine
Cevuard, Sandrine
中科院分区:
地球科学3区
文献类型:
--
作者:
Park, Iseul;Jolly, Arthur;Matoza, Robin S.;Kennedy, Ben;Kilgour, Geoff;Johnson, Richard;Garaebiti, Esline;Cevuard, Sandrine

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2017年至2018年,瓦努阿图Ambassador火山发生了新一轮的动荡和潜水/潜水岩浆/岩浆喷发。我们在2018年喷发事件的最后阶段安装了一个多站地震声学网络,包括7个3分量宽带地震站和4个3元件(最大元件间间隔为26-62米)次声阵列,在喷发事件结束时捕获了至少6次报告的重大爆炸。火山喷发活动期间,观测到的火山地震信号一般在0.5 ~ 10 Hz的通带内,而对应的声波信号频率较低(< 1 Hz)。在喷发期间也观察到明显的非常长周期(< 0.2 Hz)的地震信号,但我们表明,它们是作为地面耦合的空气波产生的,并以大气声速传播。我们观察到强烈的相干次声波在所有的声学阵列在喷发。利用声波信号的波形相似性,我们检测到以前未报告的火山爆发在山顶喷口区域的基础上恒定celestrated逆时迁移(RTM)分析。所检测到的声脉冲在时间上与浅层地震火山震颤(频率为5-10 Hz)有关,我们使用简化的振幅比方法在距离喷口不同距离的地震台站对上进行了验证。振幅比在大爆炸开始时增大,然后减小,这被解释为震源上升和下降。比率的变化对于仅使用两个地震站快速识别火山动荡可能有用。这项研究重申了联合地震声学数据在改进火山活动解释和减少地球物理监测模糊性方面的价值。
A new episode of unrest and phreatic/phreatomagmatic/magmatic eruptions occurred at Ambae volcano, Vanuatu, in 2017–2018. We installed a multi-station seismo-acoustic network consisting of seven 3-component broadband seismic stations and four 3-element (26–62 m maximum inter-element separation) infrasound arrays during the last phase of the 2018 eruption episode, capturing at least six reported major explosions towards the end of the eruption episode. The observed volcanic seismic signals are generally in the passband 0.5–10 Hz during the eruptive activity, but the corresponding acoustic signals have relatively low frequencies (< 1 Hz). Apparent very-long-period (< 0.2 Hz) seismic signals are also observed during the eruptive episode, but we show that they are generated as ground-coupled airwaves and propagate with atmospheric acoustic velocity. We observe strongly coherent infrasound waves at all acoustic arrays during the eruptions. Using waveform similarity of the acoustic signals, we detect previously unreported volcanic explosions at the summit vent region based on constant-celerity reverse-time-migration (RTM) analysis. The detected acoustic bursts are temporally related to shallow seismic volcanic tremor (frequency content of 5–10 Hz), which we characterise using a simplified amplitude ratio method at a seismic station pair with different distances from the vent. The amplitude ratio increased at the onset of large explosions and then decreased, which is interpreted as the seismic source ascent and descent. The ratio change is potentially useful to recognise volcanic unrest using only two seismic stations quickly. This study reiterates the value of joint seismo-acoustic data for improving interpretation of volcanic activity and reducing ambiguity in geophysical monitoring.
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