OBSERVATION AND SIMULATION OF TSUNAMIS INDUCED BY THE 2003 TOKACHI-OKI EARTHQUAKE (M 8.0)

https://doi.org/10.22146/jag.7270

Tatsuo Ohmachi(1*), Shusaku Inoue(2), Tetsuji Imai(3)

(1) 
(2) 
(3) 
(*) Corresponding Author

Abstract


The 2003 Tokachi-oki earthquake (MJ 8.0) occurred off the southeastern coast of Tokachi, Japan, and generated a large tsunami which arrived at Tokachi Harbor at 04:56 with a wave height of 4.3 m. Japan Marine Science and Technology Center (JAMSTEC) recovered records of water pressure and sea-bed acceleration at the bottom of the tsunami source region. These records are first introduced with some findings from Fourier analysis and band-pass filter analysis. Water pressure disturbance lasted for over 30 minutes and the duration was longer than those of accelerations. Predominant periods of the pressure looked like those excited by Rayleigh waves. Next, numerical simulation was conducted using the dynamic tsunami simulation technique able to represent generation and propagation of Rayleigh wave and tsunami, with a satisfactory result showing validity and usefulness of this technique.

Keywords: Earthquake, Rayleigh wave, tsunami, near-field

Full Text:

PDF



DOI: https://doi.org/10.22146/jag.7270

Article Metrics

Abstract views : 266 | views : 310

Refbacks

  • There are currently no refbacks.


Copyright (c) 2015 Tatsuo Ohmachi, Shusaku Inoue, Tetsuji Imai

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Journal of Applied Geology Indexed by:

Web Analytics Made Easy - StatCounter  View My Stats

 

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.