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Abstract <p>New data on the composition of the pyroclastic deposits of the Krasheninnikov caldera allowed us to correlate it to the previously studied tephra horizon Geys30, which until recently was erroneously attributed to an eruption within the Geysernaya caldera. Deposits of pyroclastic density currents from the eruption that led to the formation of the Krasheninnikov caldera were found on the caldera’s rim and along the southern shore of Kronotsky Lake. Its distal tephra was found in the sediments of the Central Kamchatka Depression (CKD) at a distance of up to 200 km from the source. The age of this tephra was previously estimated at ∼30 ka, which now allows us to accept this estimate for the Krasheninnikov caldera. The identification of tephra of the caldera-forming eruption in distal sites allows for a minimum estimate of the erupted pyroclastic volume of ∼13 km<sup>3</sup> and the eruption magnitude at 6.1.</p>

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Krasheninnikov Caldera (Eastern Kamchatka): Age and Magnitude of Eruption

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • V. V. Ponomareva,
  • N. V. Gorbach,
  • E. A. Zelenin,
  • M. V. Portnyagin,
  • A. N. Rogozin,
  • O. V. Dirksen

摘要

Abstract

New data on the composition of the pyroclastic deposits of the Krasheninnikov caldera allowed us to correlate it to the previously studied tephra horizon Geys30, which until recently was erroneously attributed to an eruption within the Geysernaya caldera. Deposits of pyroclastic density currents from the eruption that led to the formation of the Krasheninnikov caldera were found on the caldera’s rim and along the southern shore of Kronotsky Lake. Its distal tephra was found in the sediments of the Central Kamchatka Depression (CKD) at a distance of up to 200 km from the source. The age of this tephra was previously estimated at ∼30 ka, which now allows us to accept this estimate for the Krasheninnikov caldera. The identification of tephra of the caldera-forming eruption in distal sites allows for a minimum estimate of the erupted pyroclastic volume of ∼13 km3 and the eruption magnitude at 6.1.