Estimating the maximum earthquake magnitude in the Iranian Plateau

Abstract

The Iranian Plateau has been subjected to destructive earthquakes throughout its history. Reliable assessment of the seismic hazard in this earthquake-prone region is therefore essential. Our study focuses on estimating the maximum earthquake magnitude as one of the main parameters of seismic hazard analysis. We implemented two quantitative approaches, namely probabilistic and deterministic. The probabilistic method allows combining the historical (i.e., incomplete) and the instrumental parts of a catalog with different levels of completeness and considers the uncertainties in earthquake magnitude determination. In this study, we used a unified, declustered, and complete catalog of earthquakes in Iran, covering the period from the 4th century B.C. to 2019. We calculated the maximum possible magnitudes for hundreds of grid points by using the seismicity data in a 200-km radial region around each grid point. The maximum possible earthquake was observed to vary between 6.0 and 8.2 and the highest values were found in the Alborz-Azarbayejan seismotectonic province, Kopeh-Dagh, central east Iran, Makran, and the southeast Zagros. The lowest 𝑚 values were found in the Persian Gulf, Arabian Platform, Esfahan-Sirjan region, and the Dasht-e-Kavir Desert in central Iran. As a second part to this study, we calculated the maximum credible earthquakes for 1 103 identified major faults by using five empirical magnitude-scaling relationships. Our results were consistent with both the observed earthquakes and the seismic potential of the various seismogenic zones of Iran. The study results can be used in future seismic hazard analyses, and have fundamental implications for mitigating seismic risk in Iran.

Seismic hazard analysis using Deterministic Seismic Hazard Analysis (DSHA) Method: A case study in Southern Malang District, East Java

“…In the deterministic approach, the results obtained were influenced by the distance of the earthquake hypocenter from the research location and the magnitude of the earthquake (Caccavale, Sacchi, Spiga, & Porfido, 2019;Concha et al, 2020;Pouryari, Mahboobi Ardakani, & Hassani, 2022). Therefore, the farthest location from the earthquake will have a small PGA value, while the closest location will have a great PGA value (Kowsari, Ghazi, Kijko, Javadi, & Shabani, 2021;Mehta & Thaker, 2022;Stewart, Luco, Hooper, & Crouse, 2020). In other words, the closer a location is to the earthquake hypocenter, the greater the PGA value (Douglas, 2002;Mendoza, Ramos, & Dimalanta, 2022).…”

A preliminary report on seismicity declustering methods and completeness magnitude in eastern Sunda Arc

“…No best solution to 𝑀 c is available with no preliminary test; different techniques may give different 𝑀 c values after which care should be taken for the most appropriate 𝑀 c . The applied technique of 𝑀 c determination depends mainly on the characteristics of the regions of interest [13,14,15].…”