Relation between structural and material circular motions in a volcanic center

Masurenkov, Yu. P.; Собисевич, А. Л.; Laverova, Ninel I.

doi:10.1134/s1028334x09080261

Cited by 4 publications

(1 citation statement)

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“…Cryptotephra from this eruption was found in Greenland ice cores and dated at 9,045 ± 64 b2k. In addition to Karymsky caldera, the Karymsky eruptive center includes a number of older calderas and hosts a stratigraphically complex package of numerous ignimbrite and pumice fall units (Leonov & Grib, 2004; Masurenkov, 1980). Three major ignimbrite units have been dated with the help of 40 Ar/ 39 Ar method yielding the ages of ∼70 (Odnoboky), ∼400 (Polovinka), and ∼1,200 ka (Stena‐Soboliny) (Bindeman et al., 2010).…”

Section: Discussionmentioning

confidence: 99%

A 6.2 Ma‐Long Record of Major Explosive Eruptions From the NW Pacific Volcanic Arcs Based on the Offshore Tephra Sequences on the Northern Tip of the Emperor Seamount Chain

Ponomareva,

Portnyagin,

Bubenshchikova

et al. 2023

Geochem Geophys Geosyst

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We present a continuous ∼6.2 Ma long record of explosive activity from the Northwest Pacific volcanic arcs based on a composite tephra sequence derived from Ocean Drilling Program Sites 882A and 884B, and core MD01‐2416 on the Detroit Seamount. Geochemical fingerprinting of tephra glass using major and trace element analyses and correlations of tephra layers between the three cores allowed the identification of 119 unique tephras, suggesting eruptions of magnitude (M) of 5.8–7.8. Age estimates for all the identified eruptions were obtained with the help of published and further refined age models for the studied cores, direct 40Ar/39Ar dating of four ash layers, and Bayesian age modeling. The glass compositions vary from low‐ to high‐K2O basaltic andesite to rhyolite and exhibit typical subduction‐related affinity. The majority of the tephras originated from Kamchatka, only a few tephras—from the neighboring Kuril and Aleutian arcs. The glass compositions revealed no temporal trends but made it possible to identify their source volcanic zones in Kamchatka and, in some cases, to determine their source eruptive centers. Our data indicates episodes of explosive activity recorded in the Detroit tephra sequence at ∼6,200, 5,600–5,000, 4,300–3,700 ka, and almost continuous activity since ∼3,000 ka. Within the latter episode, the most active intervals can be identified at 1,700–1,600, 1,150–1,050, and 600–50 ka. Geochemically fingerprinted and dated Detroit tephra sequence form a framework for dating and correlating diverse paleoenvironmental archives across the Northwest Pacific and for studies of geochemical evolution of the adjacent volcanic arcs.

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Section: Discussionmentioning

confidence: 99%

A 6.2 Ma‐Long Record of Major Explosive Eruptions From the NW Pacific Volcanic Arcs Based on the Offshore Tephra Sequences on the Northern Tip of the Emperor Seamount Chain

Ponomareva,

Portnyagin,

Bubenshchikova

et al. 2023

Geochem Geophys Geosyst

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Environmental and Near-Surface Geophysics

Eppelbaum

Khesin

2012

Lecture Notes in Earth System Sciences

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In the framework of a radioactive waste disposal and monitoring program as part of the EC Integrated Project ESDRED, we have conducted for the NDA (UK) in cooperation with Nagra (Switzerland) high resolution (0.2-4 kHz frequencies) seismic experiments in an anisotropic clay unit at the Mont Terri underground rock laboratory in Switzerland. The objective was to explore the possibilities and limitations of seismic measurements for remotely monitoring, at distances of tens of metres, the changing properties of material filling a small scaled-down version of a repository (1 m diameter tunnel) embedded in a clay formation. Recordings using vertical-component geophones attached to the inside wall of the microtunnel revealed significant waveform variations for different fill materials (empty and sand-filled) and experimental conditions (dry, wet, and pressurised). Initially, the presence of water weakens the clay, but at a later stage the seismic measurements indicate swelling of the clay material, which likely causes healing in the excavation damage zone. On the basis of our results, it is judged worthwhile to develop wireless seismic sensors that could be employed for non-intrusive monitoring during the water saturation of a repository.

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The modern fluid-magmatic system of the Pyatogorsk volcanic center

Masurenkov

Собисевич

2010

Dokl. Earth Sc.

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Relation between structural and material circular motions in a volcanic center

Cited by 4 publications

References 1 publication

A 6.2 Ma‐Long Record of Major Explosive Eruptions From the NW Pacific Volcanic Arcs Based on the Offshore Tephra Sequences on the Northern Tip of the Emperor Seamount Chain

A 6.2 Ma‐Long Record of Major Explosive Eruptions From the NW Pacific Volcanic Arcs Based on the Offshore Tephra Sequences on the Northern Tip of the Emperor Seamount Chain

Environmental and Near-Surface Geophysics

The modern fluid-magmatic system of the Pyatogorsk volcanic center

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