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

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 N-wave. It is shown that, when total energy both types kept same, short-rupture more concentrated are likely to be destructive near-field, whereas long rupture dangerous far-field. The elongated is, stronger directivity slower amplitude decays intermediate- far-fields. We present evidence this behavior by comparing rates from idealized sources showing their correlation that observed recent historical events similar AR.