Earthquake Active Zones in Southeast Sulawesi, Based on Hypocenter Relocation Using Double-Difference Method
DOI:
https://doi.org/10.56099/jrgi.v8i02.178Keywords:
Earthquake Active Zones, Hypocenter Relocation, Depth Earthquake, Southeast SulawesiAbstract
Earthquake active zones can be identified based on the distribution of their hypocenters. Sometimes, information on earthquake occurrences must be provided as soon as possible, so earthquake hypocenters are not precise. A catalog of earthquakes that have been relocated by including local earthquakes recorded by significant additions to the seismic sensor network is needed. Earthquake hypocenter relocation in Southeast Sulawesi was performed using the hypocenter double difference method on earthquake event data from January to December 2024, to determine the earthquake active zones. Earthquake event data at coordinates 02°45' - 06°15' South Latitude and 120°45' - 124°30' East Longitude. The hypocenter relocation process using the hypoDD program and the 1D ak-135 velocity model, produces a total of 277 relocated earthquake events using 21 recording sensor locations. The results of the earthquake hypocenter relocation are clearly visible in the clustered (close together) earthquake events. The depth of the earthquake after relocation is a shallow depth earthquake (h<60 km), with varying values of depth, not only through fixed depth of 10 km or other. In 2024 there there are six earthquake active zones, including Kolaka Regency, East Kolaka Regency, South Konawe Regency, southern Konawe Regency, Kendari City, Kabaena Island, and one zone in the eastern waters of Southeast Sulawesi (north of Wawonii Island, Konawe Islands Regency).
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