Azimuth estimations from a small aperture infrasonic array: Test observations at Stromboli volcano, Italy
Azimuth estimations from a small aperture infrasonic array: Test observations at Stromboli volcano, Italy
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小孔径次声波阵列的方位角估计：意大利斯特龙博利火山的测试观测
DOI：
10.1029/2018gl078851
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发表时间：
2018
影响因子：
5.2
通讯作者：
M.
中科院分区：
文献类型：
--
作者：
Yamakawa;K.;Ichihara;M.;Ishii;K.;Aoyama;H.;Nishimura;T. and Ripepe;M.
我们在意大利斯特龙博利火山测试了由三个孔径为 20 米的麦克风组成的次声阵列的性能。有四个活动通风口，间隔约 10∘。我们采用多信号分类（MUSIC）来估计检测到的信号的到达方向（DOA）。使用通过目视观察识别源孔的测试信号，将MUSIC的DOA估计的分辨率与Capon波束形成、网格搜索和相似性的分辨率进行比较。我们证实，音乐和网格搜索比其他两种方法能提供更好的 DOA 分辨率。此外，音乐在时间和频率上提供了最佳分辨率。结果表明，DOA 在不同的喷口之间切换或在短时间内波动，并且可以随频率变化，这表明存在多个活动源。评估了可能的 DOA 估计误差。小孔径次声波阵列与MUSIC相结合将成为研究和监测活火山的有力工具。
We tested the performance of an infrasonic array consisting of three microphones with a 20‐m aperture at Stromboli volcano, Italy. There were four active vents separated by ∼10∘. We employed multiple signal classification (MUSIC) to estimate direction of arrival (DOA) of the detected signals. Using test signals of which the source vents were identified by visual observation, the resolution of DOA estimation of MUSIC is compared with those of Capon beamforming, grid search, and semblance. We confirmed that MUSIC and grid search gave better resolution of DOA than the other two methods. Also, MUSIC provided the best resolutions in time and frequency. It was shown that the DOA switched between different vents or fluctuated in short time scales and can vary with frequency, which indicate multiple active sources. Possible DOA estimation errors were evaluated. A small aperture infrasonic array combined with MUSIC will become a powerful tool for studying and monitoring active volcanoes.