<Notes>On Statistics of Tsunamis in Indonesia

Abstract

A statistical analysis of the tsunamis caused by earthquakes in Indonesia was carried out to evaluate the frequency of tsunamis. After a geographical and chronological consideration of tsunami occurrence and the distribution of tsunami sources, recurrence of tsunami was analyzed with an assumption that tsunami occurrence follows a Poisson process. For the analysis of tsunamis with a variable of tsunami intensity, it seemed preferable to introduce a modified Poisson process. This analysis produces a probability for occurrence of a tsunami exceeding a given magnitude in a given period in Indonesia. Some comment is made on the locality of tsunami risk.