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PMEL Publications Abstract

FY 2021

Influence of tsunami aspect ratio on near and far-field tsunami amplitude

Sannikova, N.K., H. Segur, and D. Arcas

Geosciences, 11(4), 178, doi: 10.3390/geosciences11040178, View online (open access) (2021)

This study presents a numerical investigation of the source aspect ratio (AR) influence on tsunami decay characteristics with an emphasis in near and far-field differences for two initial wave shapes Pure Positive Wave and N-wave. It is shown that, when initial total energy for both tsunami types is kept the same, short-rupture tsunami with more concentrated energy are likely to be more destructive in the near-field, whereas long rupture tsunami are more dangerous in the far-field. The more elongated the source is, the stronger the directivity and the slower the amplitude decays in the intermediate- and far-fields. We present evidence of this behavior by comparing amplitude decay rates from idealized sources and showing their correlation with that observed in recent historical events of similar AR.

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