Infrasonic observations of the June 2009 Sarychev Peak eruption, Kuril Islands: Implications for infrasonic monitoring of remote explosive volcanism
Infrasonic observations of the June 2009 Sarychev Peak eruption, Kuril Islands: Implications for infrasonic monitoring of remote explosive volcanism
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DOI：
10.1016/j.jvolgeores.2010.11.022
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发表时间：
2011-02-01
影响因子：
2.9
通讯作者：
Rybin, Alexander
中科院分区：
文献类型：
--
作者：
Matoza, Robin S.;Le Pichon, Alexis;Rybin, Alexander
位于千岛奥斯特罗夫马图阿的Sarychev Peak(SP)于2009年6月11日至16日期间爆炸性喷发。虽然远程地震台没有记录这次喷发，但我们报告了在距SP 640-6400公里范围内的7个次声阵列上观测到的大气次声(类似于0.01-20赫兹的声波)。次声阵列由国际监测系统全球次声网络的站点和由韩国地球科学和矿产资源研究所运营的其他站点组成。最近的三个记录站的信号分别是IS44(643公里，彼得罗巴甫洛夫斯克-堪察斯基，俄罗斯堪察加半岛)、I545(1690公里，俄罗斯乌苏里斯克)和IS30(1774公里，日本Isumi)，这与基于卫星数据(Terra、NOAA、MTSAT)的喷发年表有很好的相关性。从次声数据推断的喷发年表具有比卫星数据更高的时间分辨率。从第一到达方向的后方向交叉方位确定的大气校正次声震源位置的平均质心与SP的真实位置相似15公里。波源位置接近100公里的散射是由于目前尚未解决的大气传播细节和波源复杂性造成的。我们在IS44观测到了轨道速度、后方位角偏差和信号频率含量的系统时间变化。对从SP到IS44的大气传播的初步研究表明，这些变化可以归因于热层中的太阳潮汐变化。众所周知，通过在火山喷发时部署带有地震仪的次声传感器，可以获得有关火山活动过程的更多信息。这项研究进一步突出了次声阵列在监测千岛群岛等仅有稀疏地震台网覆盖的火山区方面的巨大潜力。(C)2010爱思唯尔B.V.保留所有权利。
Sarychev Peak (SP), located on Ostrov Matua, Kurils, erupted explosively during 11-16 June 2009. Whereas remote seismic stations did not record the eruption, we report atmospheric infrasound (acoustic wave similar to 0.01-20 Hz) observations of the eruption at seven infrasound arrays located at ranges of similar to 640-6400 km from SP. The infrasound arrays consist of stations of the International Monitoring System global infrasound network and additional stations operated by the Korea Institute of Geoscience and Mineral Resources. Signals at the three closest recording stations IS44 (643 km, Petropavlovsk-Kamchatskiy, Kamchatka Krai, Russia), I545 (1690 km, Ussuriysk, Russia), and IS30 (1774 km, Isumi, Japan) represent a detailed record of the explosion chronology that correlates well with an eruption chronology based on satellite data (TERRA, NOAA, MTSAT). The eruption chronology inferred from infrasound data has a higher temporal resolution than that obtained with satellite data. Atmosphere-corrected infrasonic source locations determined from backazimuth cross-bearings of first-arrivals have a mean centroid similar to 15 km from the true location of SP. Scatter in source locations of up to similar to 100 km result from currently unresolved details of atmospheric propagation and source complexity. We observe systematic time-variations in trace-velocity, backazimuth deviation, and signal frequency content at IS44. Preliminary investigation of atmospheric propagation from SP to IS44 indicates that these variations can be attributed to solar tide variability in the thermosphere. It is well known that additional information about active volcanic processes can be learned by deploying infrasonic sensors with seismometers at erupting volcanoes. This study further highlights the significant potential of infrasound arrays for monitoring volcanic regions such as the Kurils that have only sparse seismic network coverage. (C) 2010 Elsevier B.V. All rights reserved.