Inflating Shallow Plumbing System of Bezymianny Volcano, Kamchatka, Studied by InSAR and Seismicity Data Prior to the 20 December 2017 Eruption

Mania, René; Cesca, Simone; Walter, Thomas R.; Koulakov, Ivan; Senyukov, S.

doi:10.3389/feart.2021.765668

Cited by 3 publications

(5 citation statements)

References 87 publications

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“…Lastly, we see a marked velocity increase accompanied by a decorrelation of the noise correlation functions at Bezymianny Volcano commencing 6–7 February 2016, shortly after the Zhupanov earthquake. The velocity increase occurs together with a first uplift marking the beginning of the 2016/2017 eruption cycle (Coppola et al., 2021; Mania et al., 2019, 2021). We argue that the inflation of a shallow gas, magma, or hydrothermal reservoir could cause localized velocity increases and decreases.…”

Section: Discussionmentioning

confidence: 99%

“…(2021) has revealed a complex relationship between the major volcanoes of the KVG and a potential modulation by tectonic triggers. At Klyuchevskoy and Bezymianny, a period of unrest commenced in 2016, accompanied by eruptive activity (Journeau et al., 2022; Mania et al., 2019, 2021). For Bezymianny Volcano, Mania et al.…”

Section: Discussion Of Physical Mechanisms Causing Velocity Changesmentioning

confidence: 99%

“…A previous study by Coppola et al (2021) has revealed a complex relationship between the major volcanoes of the KVG and a potential modulation by tectonic triggers. At Klyuchevskoy and Bezymianny, a period of unrest commenced in 2016, accompanied by eruptive activity (Journeau et al, 2022;Mania et al, 2019Mania et al, , 2021. For Bezymianny Volcano, Mania et al (2019) found signs of an extrusion onset in early 2016, which is why we focus on stations in Bezymianny's vicinity.…”

Section: Influence Of Volcanic Activitymentioning

confidence: 99%

“…During our study period, between the summer of 2015 and summer of 2016, Klyuchevskoy exhibited high seismic activity with intermittent eruptions. In addition, Bezymianny showed signs of the initiation of an eruptive cycle, whereas Tolbachik remained inactive (Coppola et al., 2021; Journeau et al., 2022; Mania et al., 2021). Evidence from geophysical and petrological data suggests the existence of a common magma reservoir at about 30 km depth (Fedotov et al., 2010; Ozerov et al., 1997).…”

Section: Introductionmentioning

confidence: 99%

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Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields

et al. 2023

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Volcanic inflation and deflation often precede eruptions and can lead to seismic velocity changes (dv/v $dv/v$) in the subsurface. Recently, interferometry on the coda of ambient noise‐cross‐correlation functions yielded encouraging results in detecting these changes at active volcanoes. Here, we analyze seismic data recorded at the Klyuchevskoy Volcanic Group in Kamchatka, Russia, between summer of 2015 and summer of 2016 to study signals related to volcanic activity. However, ubiquitous volcanic tremors introduce distortions in the noise wavefield that cause artifacts in the dv/v $dv/v$ estimates masking the impact of physical mechanisms. To avoid such instabilities, we propose a new technique called time‐segmented passive image interferometry. In this technique, we employ a hierarchical clustering algorithm to find periods in which the wavefield can be considered stationary. For these periods, we perform separate noise interferometry studies. To further increase the temporal resolution of our results, we use an AI‐driven approach to find stations with similar dv/v $dv/v$ responses and apply a spatial stack. The impacts of snow load and precipitation dominate the resulting dv/v $dv/v$ time series, as we demonstrate with the help of a simple model. In February 2016, we observe an abrupt velocity drop due to the M7.2 Zhupanov earthquake. Shortly after, we register a gradual velocity increase of about 0.3% at Bezymianny Volcano coinciding with surface deformation observed using remote sensing techniques. We suggest that the inflation of a shallow reservoir related to the beginning of Bezymianny's 2016/2017 eruptive cycle could have caused this local velocity increase and a decorrelation of the correlation function coda.

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Section: Discussionmentioning

confidence: 99%

Section: Discussion Of Physical Mechanisms Causing Velocity Changesmentioning

confidence: 99%

Section: Influence Of Volcanic Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deciphering the Whisper of Volcanoes: Monitoring Velocity Changes at Kamchatka's Klyuchevskoy Group With Fluctuating Noise Fields

et al. 2023

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“…Synthetic Aperture Radar (SAR) is therefore a unique method to track dome growth and deformation, as radar microwaves penetrate clouds with little interference, therefore allowing imaging independently of cloud cover, volcanic steam or ash obstructing the view. Although interferometric processing (InSAR) has been widely used to quantify volcano-wide deformation 25 or even summit deformation 26 , 27 , the small spatial extent of domes and their tendency to be incoherent in InSAR imagery (due to rapidly changing surface and morphology) have made this technique less suited for studying lava dome emplacement. Instead, the reflected SAR intensity has been used to track the dome and crater morphology 21 , 28 – 31 .…”

Section: Introductionmentioning

confidence: 99%

Lava dome cycles reveal rise and fall of magma column at Popocatépetl volcano

et al. 2023

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Lava domes exhibit highly unpredictable and hazardous behavior, which is why imaging their morphological evolution to decipher the underlying governing mechanisms remains a major challenge. Using high-resolution satellite radar imagery enhanced with deep-learning, we image the repetitive dome construction-subsidence cycles at Popocatépetl volcano (Mexico) with very high temporal and spatial resolution. We show that these cycles resemble gas-driven rise and fall of the upper magma column, where buoyant bubble-rich magma is extruded from the conduit (in ~hours-days), and successively drained back (in ~days-months) as magma degasses and crystallizes. These cycles are superimposed on a progressive decadal crater deepening, accompanied by heat and gas flux decrease, which could be partially explained by gas depletion within the magma plumbing system. Results reinforce the idea that gas retention and escape from the magma column play a key role in the short- and long-term morphological evolution of low-viscosity lava domes and their associated hazards.

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