TY - JOUR
T1 - Identification of the infrasound signals emitted by explosive eruption of Mt. Shinmoedake by three-dimensional ray tracing
AU - Saito, Hiroaki
AU - Yamamoto, Tetsuo
AU - Nakajima, Kensuke
AU - Kuramoto, Kiyoshi
AU - Yamamoto, Masa Yuki
N1 - Funding Information:
We thank Dr. M. Ichihara for providing the data obtained by the microbarometer set by ERI near Mt. Shinmoedake and Dr. S. Watanabe and Dr. Y. Kakinami for fruitful discussion. The data provided by MERRA-2, HWM14, and NRLMSISE-00 are acknowledged. This work was partly supported by Ministry of Education, Culture, Sports, Science and Technology/Japan Society for the Promotion of Science (MEXT/JSPS) KAKENHI Grant No. 17H02062 and SECOM Science and Technology Foundation and ERI Joint Usage/Research Program (JURP) Grant Nos. 2014-B-15 and 2018-B-04.
Publisher Copyright:
© 2021 Acoustical Society of America.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - Mt. Shinmoedake, a part of the Mt. Kirishima cluster of volcanoes in Kyushu, Japan, erupted on 10 March 2018. Our infrasound sensor network located at a distance of more than 200 km from the source detected signals emitted by an explosive eruption of Mt. Shinmoedake. The arrival time of the signals is divided into three time intervals. To reveal how the observed infrasound signals propagated from the source to the sensors, we carry out three-dimensional ray tracing on the basis of the Hamilton equations including the vertical profiles of the temperature and wind around the ray path. We present formulas for calculating travel time and distance of infrasound from a source to an observation site and its turning altitude in the atmosphere. We have identified four kinds of signals, namely, the waves propagated in the troposphere undergoing multiple refraction and those refracting from the stratosphere, the mesosphere, and the lower thermosphere. Brief discussion is devoted to some of the unidentified signals.
AB - Mt. Shinmoedake, a part of the Mt. Kirishima cluster of volcanoes in Kyushu, Japan, erupted on 10 March 2018. Our infrasound sensor network located at a distance of more than 200 km from the source detected signals emitted by an explosive eruption of Mt. Shinmoedake. The arrival time of the signals is divided into three time intervals. To reveal how the observed infrasound signals propagated from the source to the sensors, we carry out three-dimensional ray tracing on the basis of the Hamilton equations including the vertical profiles of the temperature and wind around the ray path. We present formulas for calculating travel time and distance of infrasound from a source to an observation site and its turning altitude in the atmosphere. We have identified four kinds of signals, namely, the waves propagated in the troposphere undergoing multiple refraction and those refracting from the stratosphere, the mesosphere, and the lower thermosphere. Brief discussion is devoted to some of the unidentified signals.
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U2 - 10.1121/10.0003366
DO - 10.1121/10.0003366
M3 - Article
C2 - 33514124
AN - SCOPUS:85100272152
SN - 0001-4966
VL - 149
SP - 591
EP - 598
JO - Journal of the Acoustical Society of America
JF - Journal of the Acoustical Society of America
IS - 1
ER -