TY - JOUR
T1 - Estimation of Vent Radii From Video Recordings and Infrasound Data Analysis
T2 - Implications for Vulcanian Eruptions From Sakurajima Volcano, Japan
AU - Muramatsu, Dan
AU - Aizawa, Koki
AU - Yokoo, Akihiko
AU - Iguchi, Masato
AU - Tameguri, Takeshi
N1 - Funding Information:
We thank H. Shimizu and T. Kozono for insightful discussions. We thank the Japan Meteorological Agency and Japanese Ministry of Land, Infrastructure, Transport, and Tourism (MLIT). Meteorological data from Kagoshima City were collected at 10-min intervals by the Japan Meteorological Agency (JMA). Infrasound data were provided by the Osumi Office of the River and National Highway, MLIT. Constructive comments from two anonymous reviewers and Associate Editor R. Carey have greatly improved the manuscript. Data used in this study are available from the following website: https://archive.iii. kyushu-u.ac.jp/public/ vYWMgAHI0o5ARGYBzShmrCYuDheen- jx_rTinBCOKnAAp. This work was funded by MEXT KAKENHI (grant JP23740332). D. M. was supported by the MEXT Integrated Program for Next Generation Volcano Research and Human Resource Development.
Funding Information:
We thank H. Shimizu and T. Kozono for insightful discussions. We thank the Japan Meteorological Agency and Japanese Ministry of Land, Infrastructure, Transport, and Tourism (MLIT). Meteorological data from Kagoshima City were collected at 10-min intervals by the Japan Meteorological Agency (JMA). Infrasound data were provided by the Osumi Office of the River and National Highway, MLIT. Constructive comments from two anonymous reviewers and Associate Editor R. Carey have greatly improved the manuscript. Data used in this study are available from the following website: https://archive.iii.kyushu-u.ac.jp/public/vYWMgAHI0o5ARGYBzShmrCYuDheenjx_rTinBCOKnAAp. This work was funded by MEXT KAKENHI (grant JP23740332). D. M. was supported by the MEXT Integrated Program for Next Generation Volcano Research and Human Resource Development.
Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.
PY - 2018/12/16
Y1 - 2018/12/16
N2 - We estimated the vent radius within Showa Crater of Sakurajima volcano from ejection velocity and flow rate of gas-particle mixtures. The ejection velocity was calculated from video recordings, and the flow rate and volume from infrasound data. Based on the assumption that the vent shape does not change during an explosion, the vent radius was estimated from 201 impulsive Vulcanian eruptions at Showa Crater, yielding values of 6.4–42.3 m (median 23.8 m), which is comparable with the width of fresh lava capping the vent, as photographed from a helicopter. Long-term changes in vent radius (i.e., over several months) show a relationship with magma accumulation within a reservoir 2–5 km beneath the crater. If the top of the conduit is assumed to be cylindrical, then the vertical extent of the gas-rich zone is estimated to be 120 m, which may reflect the depth of gas accumulation and buildup of significant overpressure.
AB - We estimated the vent radius within Showa Crater of Sakurajima volcano from ejection velocity and flow rate of gas-particle mixtures. The ejection velocity was calculated from video recordings, and the flow rate and volume from infrasound data. Based on the assumption that the vent shape does not change during an explosion, the vent radius was estimated from 201 impulsive Vulcanian eruptions at Showa Crater, yielding values of 6.4–42.3 m (median 23.8 m), which is comparable with the width of fresh lava capping the vent, as photographed from a helicopter. Long-term changes in vent radius (i.e., over several months) show a relationship with magma accumulation within a reservoir 2–5 km beneath the crater. If the top of the conduit is assumed to be cylindrical, then the vertical extent of the gas-rich zone is estimated to be 120 m, which may reflect the depth of gas accumulation and buildup of significant overpressure.
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U2 - 10.1029/2018GL079898
DO - 10.1029/2018GL079898
M3 - Article
AN - SCOPUS:85058620537
SN - 0094-8276
VL - 45
SP - 12,829-12,836
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 23
ER -