ESTIMATION OF B-VALUE VARIATION AS EARTHQUAKE PRECURSOR IN JAVA REGION WITH MAXIMUM LIKELIHOOD METHOD

• Main Author: Arubi, Dinar
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62087
• Institution: Institut Teknologi Bandung

Java Island is one of the areas with a population density of 1,171 people/km2, which is relatively high compared to other regions in Indonesia. The tectonic setting of the Java region is affected by the interaction of the tectonic plate collision between the Indo-Australian Plate under the Eurasian Plate which moves at a subduction rate of 67 mm/year. In addition, the presence of several active faults on Java Island also contributes to the tectonic setting condition. The implication is the relatively high level of potential earthquake events and some of them are destructive earthquakes. The calculation of b-value variations from Gutenberg-Richter Equation plays an important role in estimating the occurrence of earthquakes. In this thesis research, earthquakes analysis was carried out in the form of spatial and temporal variations of b-value from earthquake catalog data in 1900-2016 for the Java Island region. Based on the estimation of earthquake recurrence time for magnitude 6.5, 7, and 7.5, and also the analysis of spatial variation of b-value shows the areas with the potential for destructive earthquakes in the west and east Java region. In addition, this result also shows the existence of a seismic gap zone in the southern part of Central Java.