An extending island arc: The case of Kamchatka

Kozhurin, Andrey; Zelenin, Egor

doi:10.1016/j.tecto.2017.04.001

Cited by 27 publications

(39 citation statements)

References 19 publications

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“…A . Photogrammetric digital elevation model of the plateau (Kozhurin and Zelenin, ) overlaid with hillshaded ArcticDEM. Trench location is shown by the box.…”

Section: Methodsmentioning

confidence: 99%

“…B . topographic profile across the plateau (Kozhurin and Zelenin, ), location is shown by the black line on A. Dotted lines approximate ignimbrite surface, vertical scale exaggerated.…”

Section: Methodsmentioning

confidence: 99%

“…With known fault scarp height ( H ), fault dip ( α ) and the age ( t ) of the deformed surface, as for Shirokoe and Semiachik ignimbrite plateaus (Kozhurin and Zelenin, ), it becomes possible to estimate the displacement rate, r D = H / t sin α , and recurrence interval i r of ruptures with mean displacement D AV along each fault:…”

Section: Methodsmentioning

confidence: 99%

“…Main tectonic features, volcanic belts and active fault zones of Kamchatka. Central Kamchatka Depression (CKD) and smaller half‐grabens (as in Kozhurin and Zelenin, ) are filled with yellow; volcanic belts of the Sredinny Range and the Eastern Volcanic Front (EVF) are filled with red, Holocene volcanic centres (Ponomareva et al ., ) are indicated. Faults are black lines with hatches for normal faults, triangles for reverse and thrust faults, and one‐sided arrows for strike‐slip faults.…”

Section: Introductionmentioning

confidence: 99%

“…However, a very similar structural pattern is also observed in the back‐arc rifting zone of Taupo, New Zealand (e.g., Villamor et al ., ), where faulting occurs both within the volcanic zone and north of it. In the case of Kamchatka, as was shown by Kozhurin and Zelenin (), faulting, spatially linked to EVF volcanism, appears to result from the superposition of regional ocean‐directed lateral extension on a magmatic thinning of a brittle crust along the volcanic belt, similar to the Taupo zone. Previous work on EVF faulting (Legler and Parfenov, ; Florensky and Trifonov, ; Leonov, ; Kozhurin and Zelenin, ) considered spatial distribution, fault type, and average deformation rate, whereas paleoseismological parameters, such as earthquake recurrence and magnitude, remained unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Tephrochronological dating of paleoearthquakes in active volcanic arcs: A case of the Eastern Volcanic Front on the Kamchatka Peninsula (northwest Pacific)

Zelenin

Kozhurin

Пономарева

et al. 2019

J Quaternary Science

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Investigation of active faults is crucial for the seismic hazard assessment and, in the case of volcanic belts, it provides a deeper understanding of the interactions between volcanism and tectonic faulting. In this study, we report the results of the first paleoseismological and tephrochronological investigation undertaken on Holocene faulting in Kamchatka's volcanic belts. The studied trenches and additional excavations are located along the axial fault zone of the Eastern Volcanic Front, where the earlier dated tephra layers provide a robust age control of the faulting events. Electron microprobe analysis of glass from 22 tephra samples permitted correlations among the disparate tephra profiles for constructing a summary tephra sequence. The latter, together with published geochronological data, allowed the construction of a Bayesian age model. Detailed examination of the tephra layers deformed by faulting allowed us to reconstruct and date six faulting events with the offsets of 1 to 20 cm indicating paleoearthquakes with magnitudes of Mw < 5.4. Holocene crustal seismicity of the Eastern Volcanic Front manifests temporal clustering rather than a uniform flux of events. However, no correlation between dated seismic events and the largest Holocene eruptions of proximal volcanoes was observed.

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“…A . Photogrammetric digital elevation model of the plateau (Kozhurin and Zelenin, ) overlaid with hillshaded ArcticDEM. Trench location is shown by the box.…”

Section: Methodsmentioning

confidence: 99%

“…B . topographic profile across the plateau (Kozhurin and Zelenin, ), location is shown by the black line on A. Dotted lines approximate ignimbrite surface, vertical scale exaggerated.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tephrochronological dating of paleoearthquakes in active volcanic arcs: A case of the Eastern Volcanic Front on the Kamchatka Peninsula (northwest Pacific)

Zelenin

Kozhurin

Пономарева

et al. 2019

J Quaternary Science

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Mantle and crustal sources of magmatic activity of Klyuchevskoy and surrounding volcanoes in Kamchatka inferred from earthquake tomography

Koulakov

Shapiro

Sens‐Schönfelder

et al. 2020

Preprint

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Klyuchevskoy and surrounding volcanoes in central Kamchatka form the Northern Group of Volcanoes (NGV), which is an area of particularly diverse and intensive Pleistocene-Holocene volcanism. In this study, we present a new seismic tomographic model of the crust and uppermost mantle beneath NGV based on local earthquake data recorded by several permanent and temporary seismic networks including a large-scale experiment that was conducted in 2015-2016 by an international scientific consortium. Having an unprecedented resolution for this part of Kamchatka, the new model reveals many features associated with the present and past volcanic activity within the NGV. In the upper crust, we found several prominent high-velocity anomalies interpreted as traces of large basaltic shield volcanoes, which were hidden by more recent volcanic structures and sediments. We interpret the mantle structure to reflect asthenospheric flow up through a slab window below the Kamchatka-Aleutian junction that feeds the entire NGV. The interaction of the hot asthenospheric material with fluids released from the slab determines the particular volcanic activity within the NGV. We argue that the eastern branch of the Central Kamchatka Depression, which is associated with a prominent low-velocity anomaly in the uppermost mantle, was formed as a recent rift zone separating the NGV from the Kamchatka Eastern Ranges.

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