KAJIAN SEISMISITAS DAN PERIODE ULANG GEMPA BUMI DI ACEH

Abstract

Indonesia is one of the country that is very prone to the tectonic earthquake and tsunami, in particular Aceh areas that face directly with the confluence of two highly active tectonic plates which causes the frequent seismic activity in the area of research. The aim of research is to analyze the level of seismicity and return period of an earthquake that occurred in Aceh by using the relationship between the frequency of earthquakes with magnitudes that can be known seismicity index value and the period of limitation coordinates 94 0-100 0 BT and 0 0-8 0 LU, magnitude ≥ 3.0 SR and depth of ≤ 80 km from 1974 to 2014 that sourced from two catalogs of earthquakes, National Earthquake Information Center (NEIC) and International Seismological Center (ISC). The steps of this research are the conversion of data from both catalogs into data dat and analyzed by using software Zmap. The result of analysis between frequency and magnitude of the earthquake shows that the value of a-value and b-value is the smallest on the island of Simeulue, Northwest Aceh and North Aceh, temporarily re-earthquake period is 5SR that ranges between 1-4 months and 6SR that ranges 2-5 years.