IDENTIFIKASI FOCAL MECHANISM GEMPABUMI LOMBOK TAHUN 2018 MENGGUNAKAN METODE INVERSI WAVEFORM TIGA KOMPONEN

ABSTRACT
The island of Lombok is one of the islands in Indonesia prone to the earthquakes
because the location of this island is very close to the Indo-Australian and
Eurasian Plate subduction zones. There were about 2 large earthquakes have
occurred in the last few years, a 6.1- magnitude earthquake on January 1, 2000
and a 5.4- magnitude earthquake on June 22, 2013. This study was intended to
identify fault causes of earthquakes by using the Three Component Waveform
Inversion method in Lombok Island region within July to August 2018. The
earthquake data used was earthquake data which included waveform, time,
coordinates, depth, and earthquake magnitude. The use of seismogram analysis by
using three components waveform was carried out to obtain the moment tensor.
Then by using the ISOLA software, the results of curve fitting and beachball were
obtained as a representation of the type of fault. The results of the study showed
that the fault pattern which caused the earthquake in Lombok Island within July to
August 2018 was dominated by oblique reverse fault which was influenced by the
Flores Fault. This result is expected to be a reference material for disaster
mitigation.