Differential Phase Analysis for Volcanic Tremor Detection and Source Location

IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Andrés Barajas, Nikolai M. Shapiro, German Prieto
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Abstract

We present observations showing that during episodes of volcanic tremors, the phase of inter-station cross-correlations becomes stable. We propose a new quantity, the phase coherence, to identify the differential phase stability in recordings obtained from a single pair of stations, which is extrapolated to the seismic network. Then, we present a new approach based on the estimation of differential travel times through the differential phase measurements, to locate the sources of tremors occurring at the end of 2015 at the Klyuchevskoy Volcanic Group in Kamchatka, Russia. We present evidence supporting the existence of two types of activity happening simultaneously during the tremor episode: the main tremor source, originating from a region located between 7 and 9 km depth under the main volcanoes, and the widespread occurrence of weak low-frequency earthquakes occurring at random locations. We show how the phase coherence and the differential phases can be used to provide information on the stability of the tremor source position and to estimate its location.

Abstract Image

用于火山震颤探测和震源定位的差分相位分析法
我们的观测结果表明,在火山震颤期间,台站间交叉相关的相位变得稳定。我们提出了一个新量--相位相干性,用于识别单对台站记录中的差分相位稳定性,并将其推断到地震网络中。然后,我们提出了一种基于通过差分相位测量估算差分旅行时间的新方法,以确定 2015 年底在俄罗斯堪察加半岛克柳切夫斯基火山群发生的震源。我们提出的证据支持在震颤期间同时发生两类活动:源自主火山下 7 至 9 千米深处区域的主震源,以及在随机位置广泛发生的微弱低频地震。我们展示了如何利用相位一致性和差分相位来提供震源位置稳定性的信息,并估算其位置。
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来源期刊
Journal of Geophysical Research: Solid Earth
Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics
CiteScore
7.50
自引率
15.40%
发文量
559
期刊介绍: The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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