Analysis of Aftershock Decay Bali Earthquake 13 December 2022 using GEOSTAT Software Version 2.0 for Seismic Risk Reduction Takhul Bakhtiar
BMKG
Abstract
There has been an earthquake in the Bali Region with a magnitude of M5.2 on December 13, 2022 with a depth of 10 km. This event resulted in a series of aftershocks. This event resulted in a series of aftershocks. This study aims to analyze the decay time of aftershocks that occurred in the area as a mitigation measure and reduce the risk of earthquakes. The method used in this research is the method of Mogi I, Mogi II, Omori and Utsu in GEOSTAT V2.0 software. This study uses the earthquake repository data BMKG for a period of 7 days since the Mainshock occurred. The calculation results show that aftershocks are predicted to decay on the 14th day for the Mogi I method (r = -0.96468), the 9 th day for Mogi II (r = -0.9577), the 14th day for Utsu (r = -0.96484) and 17th Day for Omori (r = 0.922). A suitable method for predicting the decay time of aftershocks is the Utsu method (r = -0.96484). Estimated time of aftershock decay can be used as an effort to mitigate and reduce the risk of earthquakes.
Keywords: Omori, Mogi I, Mogi II, Utsu, Aftershock decay, Seismic Risk Reduction
