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Bulletin of Volcanology

, Volume 65, Issue 7, pp 477–485 | Cite as

Seismicity and crustal deformation preceding the January 1996 eruptions at Karymsky Volcanic Center, Kamchatka

  • Vyacheslav M. ZobinEmail author
  • Valeria I. Levina
  • Mefodi A. Maguskin
Research Article

Abstract

Two explosive eruptions occurred on 2 January 1996 at Karymsky Volcanic Center (KVC) in Kamchatka, Russia: the first, dacitic, from the central vent of Karymsky volcano, and the second, several hours later, from Karymskoye lake in the caldera of Akademia Nauk volcano. The main significance of the 1996 volcanic events in KVC was the phreatomagmatic eruption in Karymskoye lake, which was the first eruption in this lake in historical time, and was a basaltic eruption at the acidic volcanic center. The volcanic events were associated with the 1 January Ms 6.7 (Mw 7.1) earthquake that occurred at a distance of about 9–17 km southeast from the volcanoes just before the eruptions. We study the long-term (1972–1995) and short-term (1–2 January 1996) characteristics of crustal deformations and seismicity before the double eruptive event in KVC. The 1972–1995 crustal deformation was homogeneous and characterized by a gradual extension with a steady velocity. The seismic activity in 1972–1995 developed at the depth interval from 0 to 20 km below the Akademia Nauk volcano and spread to the southeast along a regional fault. The seismic activity in January 1996 began with a short sequence of very shallow microearthquakes (M ~0) beneath Karymsky volcano. Then seismic events sharply increased in magnitude (up to mb 4.9) and moved along the regional fault to the southeast, culminating in the Ms 6.7 earthquake. Its aftershocks were located to the southeast and northwest from the main shock, filling the space between the two active volcanoes and the ancient basaltic volcano of Zhupanovsky Vostryaki. The eruption in Karymskoye lake began during the aftershock sequence. We consider that the Ms 6.7 earthquake opened the passageway for basic magma located below Zhupanovsky Vostryaki volcano that fed the eruption in Karymskoye lake.

Keywords

Kamchatka Karymsky Volcanic Center Seismicity Deformations 1996 eruptions 

Notes

Acknowledgements

L. Bazanova helped us with the geological information about Mt. Zhupanovsky Vostryaki. M. Bursik, M. Hagerty, O. Spieler and an anonymous reviewer helped improve the manuscript.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Vyacheslav M. Zobin
    • 1
    Email author
  • Valeria I. Levina
    • 2
  • Mefodi A. Maguskin
    • 3
  1. 1.Observatorio VulcanológicoUniversidad de ColimaColima Mexico
  2. 2.Kamchatka Experimental and Methodical Department, Geophysical ServiceRussian Academy of SciencesPetropavlovskRussia
  3. 3.Institute of VolcanologyRussian Academy of SciencesPetropavlovskRussia

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