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Overview of Tsunami

  • Tatsuhiko Saito
Chapter
Part of the Springer Geophysics book series (SPRINGERGEOPHYS)

Abstract

When a large earthquake occurs in an offshore region, a tsunami is generated. The generation and propagation can be mathematically described based on equation of motion. This chapter visualizes and overviews tsunami generation and propagation to obtain an overall grasp of tsunamis and elucidate their fundamental nature. Section 2.1 illustrates the tsunami generation and propagation caused by a huge earthquake. We use a dynamic rupture scenario constructed for an anticipated huge earthquake in the Nankai Trough, Japan. Section 2.2 shows a simple model for the generation and propagation. While the generation is basically independent of gravity, gravity is the main force to move tsunami. Section 2.3 describes the fundamental properties of the propagation. Tsunami propagation depends on the wavelength and sea depth. Also, when the sea depth is very shallow, tsunami becomes to show nonlinear characteristics. Section 2.4 summarizes the main points of tsunami generation and propagation.

Keywords

Earthquake rupture Seismic wave Permanent displacement Nonlinear tsunami 

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Copyright information

© Springer Japan KK, part of Springer Nature 2019

Authors and Affiliations

  • Tatsuhiko Saito
    • 1
  1. 1.National Research Institute for Earth Science and Disaster ResilienceTsukubaJapan

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