Source Fault Analyses from InSAR Data and Aftershocks for the Fin Doublet Earthquakes on ۱۴ November ۲۰۲۱ in Hormozgan Province, South Iran

The Fin doublet earthquakes with magnitudes MN ۶.۲ and ۶.۳ occurred on November ۱۴, ۲۰۲۱ in Hormozgan province, south of Iran, and were followed by many aftershocks with magnitude range between MN ۲.۵ and MN ۵.۰. In this study, first we conducted the InSAR analysis using the satellite data from European Space Agency (ESA) to the Fin doublet earthquakes. The displacement field obtained from interferometric observations in ascending and descending directions, exhibit ~E-W oriented pattern reverse fault. Then, we relocated aftershocks that were recorded between November ۱۴, ۲۰۲۱ and January ۱۴, ۲۰۲۲, using the double-difference relocation method (hypoDD). The general pattern of relocated aftershocks distribution shows a seismic zone covering an area of approximately ۲۵×۱۷ km۲. The cross-sections through aftershock locations show that the dominant depth range of aftershocks is from ~۴ to ~۲۳ km. The results show that the focal depths decrease toward the northeastern part of the region and deeper-aftershocks are located in the southwestern part. The interferometric observations and distribution of relocated aftershocks suggest the source fault(s) of the Fin doublet earthquakes strikes along a nearly west–east line and dip toward south-to-southeast.

کلیدواژه ها:

Fin-Hormozgan ، Doublet earthquakes ، InSAR ، aftershocks ، South of Iran ، Relocation ، hypoDD