Magnitude-frequency distribution of volcanic explosion earthquakes 5. Volcanology

Takeshi Nishimura, Masato Iguchi, Mohammad Hendrasto, Hiroshi Aoyama, Taishi Yamada, Maurizio Ripepe, Riccardo Genco

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Magnitude-frequency distributions of volcanic explosion earthquakes that are associated with occurrences of vulcanian and strombolian eruptions, or gas burst activity, are examined at six active volcanoes. The magnitude-frequency distribution at Suwanosejima volcano, Japan, shows a power-law distribution, which implies self-similarity in the system, as is often observed in statistical characteristics of tectonic and volcanic earthquakes. On the other hand, the magnitude-frequency distributions at five other volcanoes, Sakurajima and Tokachi-dake in Japan, Semeru and Lokon in Indonesia, and Stromboli in Italy, are well explained by exponential distributions. The statistical features are considered to reflect source size, as characterized by a volcanic conduit or chamber. Earthquake generation processes associated with vulcanian, strombolian and gas burst events are different from those of eruptions ejecting large amounts of pyroclasts, since the magnitude-frequency distribution of the volcanic explosivity index is generally explained by the power law.

Original languageEnglish
Article number125
Journalearth, planets and space
Volume68
Issue number1
DOIs
Publication statusPublished - 2016 Dec 1

Keywords

  • Explosion
  • Exponential distribution
  • Magnitude
  • Power law

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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