Analysis of Peak Ground Acceleration (PGA) and Modified Mercalli Intensity (MMI) Scale using PSHA Method in Lampung Province

Muhammad Harun Yahya; Almaida Enggar Ashari; Arifan Jaya Syahbana; Yanif Dwi Kuntjoro; Ahmad Luthfin

doi:10.21831/inersia.v20i2.73063

Analysis of Peak Ground Acceleration (PGA) and Modified Mercalli Intensity (MMI) Scale using PSHA Method in Lampung Province

Muhammad Harun Yahya, Departement Of Mathematics, Faculty of Military Mathematics and Natural Science, Republic of Indonesia Defense University, West Java 16810, Indonesia
Almaida Enggar Ashari, Departement Of Physics, Faculty of Science and Technology, Maulana Malik Ibrahim Islamic State University Malang, East Java 65144, Indonesia
Arifan Jaya Syahbana, Geological Disaster Research Center, National Research and Innovation Agency, Special Region of Yogyakarta 55281, Indonesia
Yanif Dwi Kuntjoro, Departement Of Mathematics, Faculty of Military Mathematics and Natural Science, Republic of Indonesia Defense University, West Java 16810, Indonesia
Ahmad Luthfin, Departement Of Physics, Faculty of Science and Technology, Maulana Malik Ibrahim Islamic State University Malang, East Java 65144, Indonesia

10.21831/inersia.v20i2.73063

Abstract

Earthquakes are inevitable natural disasters that are challenging to predict, yet effective mitigation is crucial. Lampung Province, located in Indonesia, faces significant tectonic activity due to the Sumatra Fault System (SFS) and the subduction of the Indo-Australian and Eurasian plates. Its strategic location as the gateway to Sumatra Island further underscores the importance of understanding earthquake hazards in the region. This study analyzes earthquake risks in Lampung Province using a micro-scale approach that integrates Peak Ground Acceleration (PGA) and Modified Mercalli Intensity (MMI) values through the PSHA method. The PSHA method identifies earthquake microzonations and generates PGA values that are then converted to the MMI scale to determine the intensity of earthquake strength. The mapping of Lampung Province identified five zones with different levels of earthquake hazard, ranging from VII to XI MMI with varying PGA values. The first zone, on the VII MMI scale, has a PGA ranging from 0.20 to 0.25g. The second zone, in the VIII MMI scale category with PGA ranging from 0.20 to 0.40g. The third zone, falls within the IX MMI scale category with PGA ranging from 0.40 to 0.70 g. The fourth zone is categorized as X MMI scale with PGA values ranging from 0.70 to 1.00g. The fifth zone, has a scale of XI MMI with a range of PGA values between 1.00 and 2.50 g. Areas with higher PGA and MMI scales indicate a greater potential for severe damage, highlighting the need for targeted mitigation strategies in high-risk zones. These findings provide a foundation for disaster preparedness and urban planning in Lampung Province.

Keywords

Earthquake; Lampung; PSHA; PGA; MMI

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DOI: https://doi.org/10.21831/inersia.v20i2.73063