Characteristics of Intraslab Earthquake Waves
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Abstract
Earthquakes frequently occur in Indonesia and can cause significant damage, especially in high-risk areas such as West Sumatra. One type of potentially dangerous earthquake is the intraslab earthquake, which occurs within the subducting plate at depths of 50-300km. this study aims ti identify the characteristics of infraslab earthquakes in West Sumatra and their potential impacts. The data consists of 100 earthquake events from 2008-2015, including 24 intraslab earthquakes. A quantitative analysis was conducted using MATLAB and QGIS. The results show that Peak Ground Acceleration (PGA) for the horizontal component ranges from 0.98 to 36 Gal, and from 1.07 to 10 Gal for the vertical component. The frequency content of the earthquakes ranges from 0.6 to 21 Hz (period 0.05-1.76 seconds). This indicates that intraslab earthquakes have the potential to generate significant seismic loads even though their sources are located within the tectonic plate. The highest Peak Spectral Acceleration (PSA) recorded is 0.431g, and the lowest is 0.004g. The maximum Arias Intensity is around 0.045 cm/s, which is considered moderate. This study provides insights into the seismic hazards of intraslab earthquakes as a basis for disaster mitigation in earthquake-prone areas.
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