Velocity properties of the lithosphere in the ocean-continent transition zone in the Kamchatka region from seismic tomography data

Nizkous, Irina; Санина, И. А.; Kissling, Edi; Gontovaya, L. I.

doi:10.1134/s1069351306040033

Cited by 29 publications

(17 citation statements)

References 8 publications

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“…The use of approximately equal numbers of P and S phases enables the determination of high quality source locations. Approximately same dataset has already been used by other authors in (Nizkous et al, 2006, Khubunaya et al, 2007 where they report the distribution of P velocity beneath the Kluchevskoy group. We have also performed the inversion for the full dataset and obtained rather similar results as in the previous studies.…”

Section: Kluchevskoy Volcano Group: Multi-level Feeding Determines Thmentioning

confidence: 79%

Multiscale Seismic Tomography Imaging of Volcanic Complexes

Koulakov¹

2012

Updates in Volcanology - A Comprehensive Approach to Volcanological Problems

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Section: Kluchevskoy Volcano Group: Multi-level Feeding Determines Thmentioning

confidence: 79%

Multiscale Seismic Tomography Imaging of Volcanic Complexes

Koulakov¹

2012

Updates in Volcanology - A Comprehensive Approach to Volcanological Problems

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“…Evidence for a gap in the subducting plate at the edge of the Kuril-Kamchatka and Aleutian subduction zones was obtained from teleseismic tomography by Lees et al (2007a). Structures above the subducting slab have been observed by Gorbatov et al (1999), Nizkous et al (2006), and recently, by Koulakov et al (2016). In particular, the later work found inclined low-velocity anomalies connecting the area of the Klyuchevskoy group with the slab at ~100 km depth that have been interpreted as fluid pathways feeding the volcanoes of the group.…”

Section: Introductionmentioning

confidence: 89%

Magma source beneath the Bezymianny volcano and its interconnection with Klyuchevskoy inferred from local earthquake seismic tomography

Ivanov

Koulakov

West

et al. 2016

Journal of Volcanology and Geothermal Research

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We present a new 3D model of P and S wave velocities and Vp/Vs ratio to km depth beneath the active Klyuchevskoy and Bezymianny volcanoes (Kamchatka, Russia). In this study, we use travel time data from local seismicity recorded by temporary stations of the PIRE experiment from October 24 to December 15, 2009 and permanent stations operated by the Kamchatkan Branch of Geophysical Survey (KBGS). The calculations were performed using the LOTOS code (Koulakov, 2009). The resolution limitations were explored using a series of synthetic tests with checkerboard patterns in the horizontal and vertical sections. At shallow depths, the resulting Vp and Vs anomalies tend to alternate on opposite sides of the lineation connecting the most active volcanic centers of the Klyuchevskoy Volcanic Group (KVG). This prominent lineation suggests the presence of a large fault zone passing throughout the KVG, consistent with regional tectonics. We suggest that this fault zone weakens the crust creating a natural pathway for magmas to reach the upper crust. Beneath Bezymianny volcano we observe a shallow anomaly of high Vp/Vs ratio extending to 5-6 km depth. Beneath Klyuchevskoy another high Vp/Vs anomaly is observed, at deeper depths of 7 and 15 km. These findings are consistent with the regional-scale model of Koulakov et al. (2013a) and provide some explanation for how very different eruption styles can be maintained at two volcanoes in close proximity over numerous eruption cycles.

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“…The velocity structure near the source also plays an important role. We used the CRUST2 model but with some modifications inspired from studies in the area or areas close to the central Kurile arc [ Nakanishi et al , 2004; Nizkous et al , 2006; Watanabe et al , 2006]. …”

Section: Earthquake Source Process Inversionmentioning

confidence: 99%

On the deformation cycle of a strongly coupled plate interface: The triple earthquakes of 16 March 1963, 15 November 2006, and 13 January 2007 along the Kurile subduction zone

Raeesi

Atakan

2009

J. Geophys. Res.

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The great plate interface Kurile earthquake of 15 November 2006 (Mw = 8.3) was immediately followed by normal aftershocks in the outer rise of the central Kurile subduction zone. Two months later at a distance <50 km from this event the 13 January 2007 (Mw = 8.1) earthquake with a pure normal mechanism occurred in the outer rise of the central Kurile. The 15 November 2006 earthquake ruptured an area of 280 × 150 km2 with maximum slip of almost 7 m, while the 13 January 2007 earthquake ruptured an area of 240 × 40 km2 with a maximum slip of almost 14 m. These two significant events were preceded by a major reverse earthquake on 16 March 1963 (Mw = 7.7) that took place close to the location of the 13 January 2007 earthquake. These very different earthquakes demonstrate the different stages of the deformation cycle along strongly coupled plates at the central Kurile arc and present a rare case of stress regime reversal over a short time span. In order to understand the details of these three earthquakes, we inverted for the source rupture processes of the earthquakes and delineated the location and dimension of asperities. The role of gravity and topography anomalies and their correlation to the asperity distribution as well as the long‐term seismicity is studied in detail. Using trench‐parallel Bouguer anomaly, we have identified the differences in the asperities and the location of larger normal outer rise aftershocks as well as the location of 13 January 2007 earthquake. We also show that the long‐term seismicity of the central Kurile arc is confined to the intraslab and not the plate interface. The static stress transfer for these earthquakes showed that the stress on optimally oriented thrust faults is increased in the northeastern part of the rupture area of the 15 November 2006 earthquake. Absence of major and great earthquakes to the northeastern immediate vicinity of the rupture area of the 15 November 2006 earthquake supports the hypothesis that this area is mature for the next strong earthquake along the Kurile arc.

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Velocity properties of the lithosphere in the ocean-continent transition zone in the Kamchatka region from seismic tomography data

Cited by 29 publications

References 8 publications

Multiscale Seismic Tomography Imaging of Volcanic Complexes

Multiscale Seismic Tomography Imaging of Volcanic Complexes

Magma source beneath the Bezymianny volcano and its interconnection with Klyuchevskoy inferred from local earthquake seismic tomography

On the deformation cycle of a strongly coupled plate interface: The triple earthquakes of 16 March 1963, 15 November 2006, and 13 January 2007 along the Kurile subduction zone

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