Abstract
Stress drop is a fundamental parameter of earthquake source that describes stress before and after an earthquake. The purpose of this study was to determine the tectonic characteristics of the Banda sea region. The research method used is a mathematical analysis and Nelder Mead Simplex nonlinear inversion methods. The results show that the Banda Sea is the area with complex tectonic conditions and large earthquake impacts. The Banda sea earthquake generated a stress drop of between 2 MPa -10 MPa from small to medium, it can be concluded that the rocks in the Banda Sea are relatively harder because the Banda Sea has a complex and varied oceanographic profile. The Banda Sea contains many continental fragments and has very deep ocean basins in the North Banda and Weber Deep, as well as plate rollbacks that form geometry in the shape of a spoon. The strength of rocks in the Banda Sea is also strengthened by the results of gravitational anomalies, there are significant differences in the gravity anomalies around the Banda ocean which indicate high density. This information is very important to know the amount of pressure released shortly after the earthquake which has a very large impact as a disaster mitigation measure.          Â
Highlights
IntroductionSeismogram signal recording from earthquake events is a combination of some earthquake property information such as earthquake source which is related to earthquake parameters such as seismic moment, source radius, and stress drop, path or path connecting the earthquake source to the earthquake vibration recording device
The value of stress released by an earthquake can be calculated with a stress drop, which is the stress ratio before and after an earthquake where the accumulation of stress on rocks is released right after the earthquake occurs (United States Geological Survey, 2019).Seismogram signal recording from earthquake events is a combination of some earthquake property information such as earthquake source which is related to earthquake parameters such as seismic moment, source radius, and stress drop, path or path connecting the earthquake source to the earthquake vibration recording device. carry information about subsurface conditions and the effects of earthquake recorders.According to Scholz (2019), earthquake stress drop Δσ is the most basic scaling parameter to describe the source of an earthquake
The voltage drop connects the average slip error to the characteristic dimension, which is often simplified by the radius r for circular cracks
Summary
Seismogram signal recording from earthquake events is a combination of some earthquake property information such as earthquake source which is related to earthquake parameters such as seismic moment, source radius, and stress drop, path or path connecting the earthquake source to the earthquake vibration recording device. According to Scholz (2019), earthquake stress drop Δσ is the most basic scaling parameter to describe the source of an earthquake. The voltage drop connects the average slip error to the characteristic dimension, which is often simplified by the radius r for circular cracks. Since the average slip and r dimensions are related to the seismic moment Mo, and the angular frequency fc, we can consider stress drop as a parameter that connects low frequencies, the moment of energy emitted to the high frequency portion to fc. This, provides clues about how the voltage drop drives high frequency ground motion, such as peak ground acceleration (PGA) (Baltay, 2019)
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