Hypocenter relocation of the Mw 5.9 eastern Manggarai earthquake 2022 and its aftershocks based on BMKG seismic network

Abstract The moderate earthquake (Mw 5.9) struck eastern Manggarai and its surroundings on February 21, 2022, at 12:36:00 UTC. Although this was classified as a earthquake, it produced significant number of aftershocks. aftershocks could be observed the post-seismic activity, which still well recorded until March 31, 2022. hypocenter location is updated by applying double-difference method. aftershock distribution striking in west-east orientation dipping to south, emphasizing geometry faults. strike dip directions are consistent with focal mechanism determined Indonesian Agency for Meteorology, Climatology, Geophysics (BMKG). Most after relocation distributed depth < 25 km; mainshock 21.5 km. study shows that sequence propagates toward up-dip direction. also reveals most situated slightly off main fault plane complex splay Therefore, we conjecture co-seismic activity may trigger In addition, system consists several segments. Our benefits disaster mitigation, especially mapping segment faults Flores backarc thrust.