A Preliminary Ground Motion to Intensity Conversion Equation (GMICE) for Northern Semarang City Based on Dominant Frequency and Theoretical PGA Estimates

Wisnu Prayoga Ferdiansyah, Gatot Yuliyanto, Udi Harmoko, M. Irham Nurwidyanto

Abstract


Semarang City is one of the regions with a high level of earthquake vulnerability due to tectonic activity. Therefore, an in-depth understanding of the relationship between ground motion parameters and seismic intensity is required to support disaster mitigation efforts. This study aims to establish a Ground Motion to Intensity Conversion Equation (GMICE) based on local data from Semarang City. The data used consist data from Indonesian Agency for Meteorological, Climatological, and Geophysics (BMKG) for the period 2019–2024, covering 4 earthquake events with depths of less than 20 km and an epicentral radius of less than 100 km from the center of Semarang City. In additional, 109 dominant frequency data points obtained from microtremor surveys in the northern part of Semarang City were used. The main parameters used in this research include Peak Ground Acceleration (PGA), earthquake magnitude, epicentral distance, and seismic intensity (Modified Mercalli Intensity). Data processing was executed using Microsoft Excel, Python, and ArcGIS to produce GMICE models in two forms, simple model and complex model. The results show that the simple model of GMICE for Semarang City was obtained through linear regression expressed as MMI = 1.16 + 1.56 log(PGA). Meanwhile, the complex model of GMICE for Semarang City was obtained through multiple linear regression expressed as MMI = 1.197 + 1.376 log(PGA) – 0.191Mw – 13.460 log(R+1) + 0.11R. 

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DOI: http://dx.doi.org/10.52155/ijpsat.v53.2.7599

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