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Depth Migration of Seismovolcanic Tremor Sources Below the Klyuchevskoy Volcanic Group (Kamchatka) Determined From a Network-Based Analysis
Abstract : We present a method for automatic location of dominant sources of seismovolcanic tremor in 3-D, based on the spatial coherence of the continuously recorded wavefield at a seismic network. We analyze 4.5 years of records from the seismic network at the Klyuchevskoy volcanic group in Kamchatka, Russia, when four volcanoes experienced tremor episodes. After enhancing the tremor signal with spectral whitening, we compute the daily cross-correlation functions related to the dominant tremor sources from the first eigenvector of the spectral covariance matrix and infer their daily positions in 3-D. We apply our technique to the tremors beneath Shiveluch, Klyuchevskoy, Tolbachik, and Kizimen volcanoes and observe the yearlong preeruptive volcanic tremor beneath Klyuchevskoy from deep to shallow parts
of the plumbing system. This observation of deep volcanic tremor sources demonstrates that the cross-correlation-based method is a very powerful tool for volcano monitoring.
Cited literature [82 references]
https://hal.archives-ouvertes.fr/hal-02880331
Contributor : Nikolai Shapiro <>
Submitted on : Wednesday, June 24, 2020 - 7:17:35 PM
Last modification on : Thursday, December 17, 2020 - 3:21:30 PM
Contributor : Nikolai Shapiro <>
Submitted on : Wednesday, June 24, 2020 - 7:17:35 PM
Last modification on : Thursday, December 17, 2020 - 3:21:30 PM
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