Co-eruptive tremor from Bogoslof volcano: seismic wavefield composition at regional distances

Co-eruptive tremor from Bogoslof volcano: seismic wavefield composition at regional distances
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博戈斯洛夫火山的共喷震颤:区域距离的地震波场组成

DOI:
10.1007/s00445-019-1347-0
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发表时间:
2020
影响因子:
3.5
通讯作者:
Mikesell, T. Dylan
Mikesell, T. Dylan
中科院分区:
地球科学3区
文献类型:
--
作者:
Haney, Matthew M.;Fee, David;McKee, Kathleen F.;Lyons, John J.;Matoza, Robin S.;Wech, Aaron G.;Tepp, Gabrielle;Searcy, Cheryl;Mikesell, T. Dylan

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我们分析了2016-2017年阿拉斯加博戈斯洛夫火山喷发过程中记录的地震震颤。博戈斯洛夫只有区域性的地震波场记录,这使得将这些记录与当地地震数据通常捕捉到的其他火山爆发联系起来成为一个挑战。我们应用时频偏振分析技术的三分量地震数据,揭示波场组成的Bogoslof喷发震颤。我们发现,在区域距离上,地震以1.5至10 Hz频段的P波为主。利用这些信息,沿着丰富的博戈斯洛夫地震目录,我们得到了70次博戈斯洛夫地震中25次的平均约化位移(DR)的估计值,其中两次主要地震的DR高达约40 cm 2,与阿拉斯加的其他VEI~3级喷发相似。总体而言,平均减少位移显示在9个月长的喷发序列的前半部分羽流高度的弱相关性,有几个显着的例外。具有最高DR值的两个事件也产生了0.05和0.15 Hz之间的超长周期(VLP)的可测量喷发震颤。
We analyze seismic tremor recorded during eruptive activity over the course of the 2016–2017 eruption of Bogoslof volcano, Alaska. Only regional recordings of the tremor wavefield exist for Bogoslof, making it a challenge to place the recordings in context with other eruptions that are normally captured by local seismic data. We apply a technique of time-frequency polarization analysis to three-component seismic data to reveal the wavefield composition of Bogoslof eruption tremor. We find that at regional distances, the tremor is dominated by P-waves in the band from 1.5 to 10 Hz. Using this information, along with an enriched Bogoslof earthquake catalog, we obtain estimates of average reduced displacement (DR) for eruption tremor during 25 of the 70 Bogoslof events.DRreaches as high as approximately 40 cm2for two of the major events, similar to other VEI~3 eruptions in Alaska. Overall, average reduced displacement displays a weak correlation to plume height during the first half of the 9-month-long eruption sequence, with a few notable exceptions. The two events with the highestDRvalues also generated measurable eruption tremor at very-long-periods (VLP) between 0.05 and 0.15 Hz.
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