ESTIMATION OF EARTHQUAKE RATES PARAMETER USING SEISMIC AND GEODETIC DEFORMATION DATA AT NUSA TENGGARA AND SURROUNDING AREA

• Main Author: ROBIANA (NIM: 22415001), RAHAYU
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23782
• Institution: Institut Teknologi Bandung

Nusa Tenggara and Banda is the regions in Indonesia which has a high tectonic activity and thus susceptible to earthquake hazard. In this region, there are three active tectonic plates collide that is Indo-Australian, Eurasian and Pacific plate. <br /> <br /> <br /> Strain rates obtained from geodetic measurements will have a similar pattern with seismic activity from the earthquake catalog. So that, strain rates analysis can be used to estimating the earthquake recurrence parameters of an earthquake source. To determine the strain rates in the study area are using eartquakes catalog data and the deformation data from GPS measurements. <br /> <br /> <br /> Catalog analysis showing variations of a-value between 2,3 - 13,6, and b-value between 0,15 - 1,84. Seismic moment release value calculated from focal mechanism catalog is 3,48 x 1024 Nm - 1,13 x 1026 Nm, while accumulated moment from geodetic is 3,07 x 1025 Nm - 1,64 x 1027 Nm. These parameters used to calculated the earthquake recurrence interval for each magnitude range. The recurrence interval for magnitude Mw &#8804; 7,5 in all tectonic zones has a short return period of up to 100 years, while significant return period variations occur for larger events with Mw > 8.0, with zone I has recurrence interval shortest compare with another zones. <br />