Power spectral density distribution of micro-barometric variation around the transition region between acoustic mode and internal mode gravity waves

Toshihiko Iyemori; Yoko Odagi; Tadashi Aoyama; Yasuharu Sano; Yoshikazu Tanaka

Presentation information

Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT31] Brand-new scope of coupling geophysics being established by infrasound and associated waves

Thu. May 26, 2016 9:00 AM - 10:30 AM 202 (2F)

Convener:*Masa-yuki Yamamoto(Department of systems engineering, Kochi University of Technology), Nobuo Arai(Disaster Mitigation Research Center, Nagoya University), Mie Ichihara(Earthquake Research Institute, University of Tokyo), Chair:Masa-yuki Yamamoto(Department of systems engineering, Kochi University of Technology), Nobuo Arai(Disaster Mitigation Research Center, Nagoya University)

10:15 AM - 10:30 AM

[MTT31-06] Power spectral density distribution of micro-barometric variation around the transition region between acoustic mode and internal mode gravity waves

★Invited papers

*Toshihiko Iyemori¹, Yoko Odagi², Tadashi Aoyama³, Yasuharu Sano², Yoshikazu Tanaka³ (1.Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, 2.Asahi University, 3.Graduate School of Science, Kyoto University)

Keywords:Micro-barometric variation, acoustic gravity waves, internal gravity waves, power spectral density

The vertical acoustic resonance between ground and upper atmosphere having period around 200 – 280 seconds has been observed during Earthquakes, volcanic eruptions, tornadoes, etc. (Kanamori and Mori, 1992; Iyemori et al., 2005; Saito et al., 2011; Nishioka et al., 2013) These periods are shorter than the Brunt-Väisälä period and close to the acoustic cutoff period. On the other hand, more slow variation around 10 minutes to 20 minutes are often observed during stormy weather, and they may belong to the internal gravity waves. In this paper, we show statistically the power spectral density distribution of micro-barometric variations near the transition region around 5 – 10 minutes.