TECTONIC STRAIN AND SEISMIC HAZARD ESTIMATION IN SUNDA STRAIT BASED ON GPS OBSERVATION DATA

Abstract

Sunda strait has a relatively high seismic activity. The high seismic activity was caused by the seismic zone
at that region, including the faults zone. Based on the high seismic activity in the Sunda Strait, it is necessary to do
research about the strain that occurred in the Sunda Strait region to determine the tectonic activity in that area and
its seismic hazard. To observe the tectonic activity in the Sunda Strait, GPS observations were made periodically
with static differential method at the observation points located in the Sunda Strait region. Based on the strain
analysis, the southwestern part of the Sunda Strait tend to experience compression and the northeastern part tend
to experience extention. Sunda Strait had a relatively high seismic hazard with maximum PGA 0,47 g.