Probabilistic earthquake hazard parameterization for Indo-Burma region using extreme value approach

Abstract

The Indo-Burma area is one of the most seismically active regions because of subduction of the Indian plate under the Burmese plate. The Indo-Burma area, which is bordered by 22°–27°N and 92°–97°E, has of late witnessed multiple moderate-to-large earthquakes. Seismic hazard assessment has been performed using the well-known extreme value theory, including estimate of return periods and likelihood of occurrence of medium to large earthquake events. The Indo-Burma region's seismic hazard parameterization has been computed using a homogeneous and thorough earthquake database created for the time span between 1973 and 2021. Due to an insufficient dataset, the b-value calculated using the GR relation was determined to be unsatisfactory (0.58). Therefore, the b-value was estimated using Gumbel's extreme value approach (0.902). The findings show that earthquake of 5.352 magnitude is likely to be the greatest annual earthquake in the study area. Additionally, the most likely large earthquakes that might happen throughout a wide range of periods have been projected and displayed.

Keywords

• Seismic hazard parameterization
• Gumbel extreme value
• Indo-Burma region
• b-value