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

Zelenin, Egor , Kozhurin, Andrey , Ponomareva, Vera and Portnyagin, Maxim (2020) Tephrochronological dating of paleoearthquakes in active volcanic arcs: A case of the Eastern Volcanic Front on the Kamchatka Peninsula (northwest Pacific). Journal of Quaternary Science, 35 (1-2). pp. 349-361. DOI 10.1002/jqs.3145.

[thumbnail of Zelenin.pdf] Text
Zelenin.pdf - Published Version
Restricted to Registered users only

Download (15MB) | Contact
[thumbnail of jqs3145-sup-0001-zelenin_appendix.docx] Text
jqs3145-sup-0001-zelenin_appendix.docx - Supplemental Material
Restricted to Registered users only

Download (20kB) | Contact
[thumbnail of jqs3145-sup-0002-zelenin_supporting] Other
jqs3145-sup-0002-zelenin_supporting - Supplemental Material
Restricted to Registered users only

Download (161kB) | Contact

Supplementary data:

Abstract

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.

Document Type: Article
Keywords: paleoseismology; trenching; tephra; geochemical fingerprinting; age modelling
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Refereed: Yes
Open Access Journal?: No
Publisher: Wiley
Date Deposited: 25 Sep 2019 07:57
Last Modified: 08 Feb 2023 09:42
URI: https://oceanrep.geomar.de/id/eprint/47813

Actions (login required)

View Item View Item