Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008

• Material Type: 記事
• Title: Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008
• Author/Editor: Hiroshi Aoyama; Hiromitsu Oshima
• Publication, Distribution, etc.: 日本 : Springer science+business media
• Publication Date: 2015-07-29
• Publication Date (W3CDTF): 2015-07-29
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 67(119)
• Volume: 67(119)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-015-0289-9; https://doi.org/10.1186/s40623-015-0289-9
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• Date Accepted (W3CDTF): 2015-09-15T20:13:28+09:00
• Date Captured (W3CDTF): 2015-08-20
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• Summary, etc.: Although forecasting an occurrence of phreatic eruption is very difficult, it has been reported that some precursory activities often precede these eruptions at several volcanoes. In this study, we observed seismic activities before and during the 2008 phreatic eruption at Meakan-dake volcano, eastern Hokkaido, Japan, by using broadband seismometers and surface mount-type tiltmeters. The precursory increase in seismicity began in late September about 2 months before the first eruption on November 18. After several rises and falls in seismicity in October and in early November, a small volcanic tremor was observed early on November 16. Although the original velocity seismogram of the tremor generally appeared to be spindle shaped, an outstanding ramp function appeared in the displacement seismogram obtained by simple integration. Since the ramp function appeared only in the horizontal components and continued for about 3 min, which is sufficiently longer than the natural period of the seismometer, we regarded the ramp function as an expression of the tilting motions of seismic stations that was quantitatively confirmed by the strong similarity between horizontal displacement seismograms and tilt data from co-located biaxial tiltmeter. Azimuthal distribution of three tilting vectors obtained from broadband seismograms was not consistent with a simple spherical source but rather strongly suggested a vertical dike under the crater. In this study, we confirmed that an almost vertical single dike effectively explains the observed tilting vectors. The estimated volume increase in the dike was 4-5 x 10(4) m(3). The strike direction of the dike is highly consistent with the alignment of the hydrothermal area on and around the volcano. Our dike model also partially explains the changes in global navigation satellite system (GNSS) measurement and in groundwater levels reported in previous research. Since a similar deformation coincided with a volcanic tremor preceding the 2006 eruption, we interpret that this must be an important preparatory process of phreatic eruptions at Meakan-dake volcano.
• DOI: 10.1186/s40623-015-0289-9; https://doi.org/10.1186/s40623-015-0289-9
• Access Restrictions: インターネット公開
• Rights (production): Creative Commons Attribution 4.0 International
• Related Material (URI): https://hdl.handle.net/2115/59830; http://id.ndl.go.jp/digimeta/9497195; https://dl.ndl.go.jp/pid/9497195; http://link.springer.com/content/pdf/10.1186/s40623-015-0289-9.pdf; http://link.springer.com/article/10.1186/s40623-015-0289-9/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-015-0289-9; http://hdl.handle.net/2115/59830
• Is Referenced By: Chemical and thermal changes in hot spring waters and fumarolic gases related to volcanic unrest at Meakandake volcano, Japan: Results of long-term geochemical monitoring from 1986 to 2022; https://cir.nii.ac.jp/crid/1360302865554821376; Interplate Slip Following the 2003 Tokachi‐oki Earthquake From Ocean Bottom Pressure Gauge and Land GNSS Data; https://cir.nii.ac.jp/crid/1360567183245672576; Conditions of magma generation at the Me-akan volcano, northern Japan; https://cir.nii.ac.jp/crid/1360579820048249728; Phreatic volcanic eruption preceded by observable shallow groundwater flow at Iwo-Yama, Kirishima Volcanic Complex, Japan; https://cir.nii.ac.jp/crid/1360861707121283840; Tracing Volcanic Activity Chronology from a Multiparameter Dataset at Shinmoedake Volcano (Kirishima), Japan; https://cir.nii.ac.jp/crid/1390282763132437248; Precursory tilt changes associated with a phreatic eruption of the Hakone volcano and the corresponding source model; https://cir.nii.ac.jp/crid/2051151842036215936; Estimation of relative source locations from seismic amplitude : application to earthquakes and tremors at Meakandake volcano, eastern Hokkaido, Japan; https://cir.nii.ac.jp/crid/2051151842055369344; Infrasonic wave accompanying a crack opening during the 2015 Hakone eruption; https://cir.nii.ac.jp/crid/2051996266961891584
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• Bibliographic ID (NDL): 9497195; http://id.ndl.go.jp/bib/9497195
• NAID: 120005652752