Geological aspects of the 2003-2004 eruption of Anatahan Volcano, Northern Mariana Islands

Setsuya Nakada, Takeshi Matsushima, Mitsuhiro Yoshimoto, Takeshi Sugimoto, Teruyuki Kato, Tsuyoshi Watanabe, Ramon Chong, Juan T. Camacho

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Anatahan Volcano, Northern Mariana Islands, began erupting in May-June 2003. A series of subplinian explosive eruptions of andesite magma began at the Eastern Crater in the eastern part of the summit caldera on the evening of 10 May. Brown tephra was sent mainly westward by strong winds. Small-scale pyroclastic surges were discharged eastward outside the caldera in late May. An andesite lava dome that had once filled the inner crater was fragmented by phreatomagmatic explosions in the middle of June. The phreatomagmatic explosions probably occurred due to interaction of the magma head with groundwater around the crater, and abundant very fine ash ("gray tephra") was discharged within the caldera and over most of the island. The volume of eruption products of the May-June eruption was estimated to be 1.4 × 10 7 m 3 dense-rock-equivalent. Erupted pumices and lava are aphyric andesite and are variously colored depending on their vesicularity. The SiO 2 contents of erupted materials decreased slightly with time. The fine gray ash is depleted in alkalies, probably due to leaching by acid hydrothermal fluids during explosions. Seismic activity resumed in late March 2004, and small strombolian-like explosions were repeated in May and June 2004. About half of the inner crater was filled with new scoria and lava.

Original languageEnglish
Pages (from-to)226-240
Number of pages15
JournalJournal of Volcanology and Geothermal Research
Volume146
Issue number1-3 SPEC. ISS.
DOIs
Publication statusPublished - Aug 15 2005

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Volcanoes
Ashes
craters
volcanoes
volcanic eruptions
Explosions
crater
calderas
explosions
andesite
explosion
lava
volcano
volcanic eruption
caldera
ashes
tephra
magma
ash
lava dome

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Geological aspects of the 2003-2004 eruption of Anatahan Volcano, Northern Mariana Islands. / Nakada, Setsuya; Matsushima, Takeshi; Yoshimoto, Mitsuhiro; Sugimoto, Takeshi; Kato, Teruyuki; Watanabe, Tsuyoshi; Chong, Ramon; Camacho, Juan T.

In: Journal of Volcanology and Geothermal Research, Vol. 146, No. 1-3 SPEC. ISS., 15.08.2005, p. 226-240.

Research output: Contribution to journalArticle

Nakada, S, Matsushima, T, Yoshimoto, M, Sugimoto, T, Kato, T, Watanabe, T, Chong, R & Camacho, JT 2005, 'Geological aspects of the 2003-2004 eruption of Anatahan Volcano, Northern Mariana Islands', Journal of Volcanology and Geothermal Research, vol. 146, no. 1-3 SPEC. ISS., pp. 226-240. https://doi.org/10.1016/j.jvolgeores.2004.10.023
Nakada, Setsuya ; Matsushima, Takeshi ; Yoshimoto, Mitsuhiro ; Sugimoto, Takeshi ; Kato, Teruyuki ; Watanabe, Tsuyoshi ; Chong, Ramon ; Camacho, Juan T. / Geological aspects of the 2003-2004 eruption of Anatahan Volcano, Northern Mariana Islands. In: Journal of Volcanology and Geothermal Research. 2005 ; Vol. 146, No. 1-3 SPEC. ISS. pp. 226-240.
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