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Atmospheric pressure change associated with the 2003 Tokachi-Oki earthquake

Watada, Shingo and Kunugi, Takashi and Hirata, Kenji and Sugioka, Hiroko and Nishida, Kiwamu and Sekiguchi, Shoji and Oikawa, Jun and Tsuji, Yoshinobu and Kanamori, Hiroo (2006) Atmospheric pressure change associated with the 2003 Tokachi-Oki earthquake. Geophysical Research Letters, 33 (24). Art. No. L24306. ISSN 0094-8276. doi:10.1029/2006GL027967.

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Clear atmospheric pressure changes associated with the 2003 Tokachi-Oki, Japan, earthquake with Mw 8.3 were recorded with the microbarographs distributed in Japan. The pressure change starts at the arrival of seismic waves and reaches its maximum amplitude at the arrival of Rayleigh waves, suggesting that the observed pressure change was driven by the ground motion of seismic waves passing by the site. We computed the seismic-to-pressure transfer function (i.e., the spectral ratio of the pressure change to the vertical ground motion velocity) for periods between 10 to 50 s from the co-located barograph and seismograph records. Comparison of the observed transfer function with the theoretical one including the finite frequency and wavelength effects for a gravitationally stratified isothermal atmosphere confirms that the observed amplitude and phase of the pressure change are explained by the acoustic coupling between the atmosphere and the ground just beneath the sensors.

Item Type:Article
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URLURL TypeDescription Information
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 2006 by the American Geophysical Union. Received 1 September 2006; revised 10 November 2006; accepted 15 November 2006; published 21 December 2006. We thank M. Koyama, F. Masutani, and Y. Yanagawa for barometer station operations, and Y. Fukao for instrumentation. Discussions with T. Sakai, M. Tahira and T. Mikumo were useful. This research is partially supported by the Ministry of Education, Science, Sports and Culture, Grant in Aid for Scientific Research (C), 15540404 and 18540413.
Funding AgencyGrant Number
Ministry of Education, Culture, Sports, Science and Technology (MEXT)15540404
Ministry of Education, Culture, Sports, Science and Technology (MEXT)18540413
Subject Keywords:acoustic coupling; pressure change; sound waves
Issue or Number:24
Record Number:CaltechAUTHORS:20141027-120417970
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Official Citation:Watada, S., T. Kunugi, K. Hirata, H. Sugioka, K. Nishida, S. Sekiguchi, J. Oikawa, Y. Tsuji, and H. Kanamori (2006), Atmospheric pressure change associated with the 2003 Tokachi-Oki earthquake, Geophys. Res. Lett., 33, L24306, doi:10.1029/2006GL027967.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50856
Deposited By: George Porter
Deposited On:27 Oct 2014 20:23
Last Modified:10 Nov 2021 19:01

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