CALCULATION OF LOGARITHMIC RATIO OF ENERGY-SEISMIC MOMENT, RUPTURE DURATION, AND MWPD FOR THE TSUNAMI EARLY WARNING SYSTEM IN BALI AND NUSA TENGGARA

• Main Author: Soekarno Saputra Rahman, Muh.
• Format: Theses
• Language: Indonesia
• Subjects: Karya Umum
• Online Access: https://digilib.itb.ac.id/gdl/view/68455
• Institution: Institut Teknologi Bandung

Bali and Nusa Tenggara regions have high seismic activities due to the subduction between the Indo-Australian Plate to the Eurasian Plate, as well as several active faults around those regions. Subduction zone and active faults on the ocean floor could trigger an earthquake thus generating a tsunami. This research aims to analyze the logarithmic ratio of the seismic moment (?), rupture duration (Tdur), and Mwpd on strong to major earthquakes in the Bali and Nusa Tenggara regions. The data used in this study are waveforms from the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) seismic stations which recorded Mw>6.0 earthquakes that occurred in Bali and Nusa Tenggara between 2010 and 2020. This results of this,study indicate earthquakes that could generate tsunamis have ? ? -4.5, Tdur ? 111.65 s, and Mwpd ? 7.0, while earthquakes that could not generate tsunamis have ? ? -5.0, Tdur ? 101.47 s, dan Mwpd ? 7.0. The results of the calculation in Mwpd for 5 minutes after origin time and Mw released by the BMKG for 15 earthquakes in Bali and Nusa Tenggara regions varied between M ± 0.2 with a correlation value of 40%. ?, Tdur, and Mwpd values could become supporting parameters for the tsunami early warning system in Bali and Nusa Tenggara regions.