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| Author: | Il-Young Che |
| Institution: | Korea Institute of Geoscience & Mineral Resources, Gajeong-dong 30, Yuseong-gu, Daejon |
| Email: | che10@kigam.re.kr |
| Authors: | Il-Young Che, Jeong-Soo Jeon, and Hee-Il Lee |
Abstract Title:
"Infrasound Observation in the Korean Peninsula" |
Abstract:
Since August 1999, Korea Institute of Geoscience and Mineral Resources, in conjunction with Southern Methodist University, has been operating Chulwon seismo-acoustic array (CHNAR) in South Korea, to discriminate artificial blasts from earthquakes. A seismo-acoustic analysis was applied to CHNAR data acquired from 1999 to 2002, and 663 seismo-acoustic events corresponding to 9% of total seismic events were discriminated as surface explosions.
Short-distance propagation of infrasound in lower atmosphere could be explained by a ray-tracing method. Calculated infrasound travel time fits well with the observed travel time when a local meteorological model was used. Local wind made it possible to construct infrasound channels in the lower atmosphere and to allow the infrasound wave to arrive at short-distance. The infrasound in lower atmosphere was also influenced by the seasonal variation of sound velocity structures.
In addition to CHNAR, a small infrasound array installed at the institute (KIGAM) was also used to apply seismo-acoustic analysis and to localize the infrasound sources, such as a large earthquake.
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| Keywords: | infrasound, explosion |
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