Influence of Tsunami Aspect Ratio on Near and Far-Field Tsunami Amplitude

Geosciences

Harvey Segur¹  NataliaK. Sannikova²  Diego Arcas³ 

[1]Department of Applied Mathematics, University of Colorado, Boulder, CO 80309, USA

[2]Joint Institute for Marine and Atmospheric Research, University of Hawai’i at Mānoa, Honolulu, HI 96822, USA

[3]Pacific Marine Environmental Laboratory, NOAA Center for Tsunami Research, National Oceanic and Atmospheric Administration, Seattle, WA 98115, USA

关键词: tsunami;    numerical modeling;    wave decay;    tsunami sensitivity;    tsunami source aspect ratio;   

DOI  :  10.3390/geosciences11040178

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown