Atmospheric Pressure Change Associated with the 2003 Tokachi-Oki Earthquake Shingo Watada, Takashi Kunugi, Keinji Hiarata, Hiroko Sugioka, Kiwamu Nishida,

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Atmospheric Pressure Change Associated with the 2003 Tokachi-Oki Earthquake Shingo Watada, Takashi Kunugi, Keinji Hiarata, Hiroko Sugioka, Kiwamu Nishida, Shoji Sekiguchi, Jun Oikawa, Yoshinobu Tsuji, Hiroo Kanamori

microbarogram2003/09/26 ２４ hour 1000sec JIZODO STS1 vault

Software configuration Microbarograph recording and telemetry systems Hardware configuration GPS antenna Sensor Control PC

On-line board PC based system SGN (Yamanashi, Japan) Air battery Portable sensor Board PC Microbarograph sensor Off-line recording system

Ground vertical velocity Filtered atmospheric pressure 3.2km/sec atmosphere Ground

atmosphere Ground for homogeneous fluid

Observational transfer function

Mechanical sensitivty check by shake table

Theoretical transfer function of long-period atmospheric waves. atmosphere Ground for homogeneous fluid High frequency asymptote for propagating acoustic waves

Conclustion The atmospheric pressure change associted with the 2003 Tokachi-Oki earthquake are observed at the co-located site of broadband seismometers. The origin of atmospheric pressure change is the Rayleigh waves passing at the site. The observational transfer functions, both phase and amplitude, are constructed and compared with the theoretical transfer functions and found consistent up to 50 sec.