Andrean V. H. Simanjuntak, Noviana Sihotang, Djati Cipto Kuncoro, I. Irwandi
After Palu Earthquake that occurred on September 2018, another moderate earthquake on April 2019 with 6.8 Moment Magnitude (Mw) at a depth of 17 km occured in Banggai Islands. The earthquake occurred on the shallow depth that generated by an active fault with horizontal mechanism on the Banggai's tectonic system. To explain the tectonic system in the Banggai Islands, we present a well-calculated 1-D velocity model by solving the coupled hypocentre-velocity inversion for 385 local earthquakes that recorded by BMKG regional network. The earthquakes was selected based on azimuthal gap, minimum number of stations and root mean square of travel-time residuals. Technically, the fit solution are simultaneously inverted for total 81 inital models and will give an unique final model. The model is constructed by using Velest program that analyse the fit velocity model from body wave traveltimes (P and S wave), together with station corrections. The final 1-D velocity model will be very useful to conduct another high precision relative relocation and make a focal mechanism inversion. © Published under licence by IOP Publishing Ltd.
Tsunami and Disaster Mitigation Research Center (TDMRC), Syiah Kuala University, Jl. Prof. Dr. Ibrahim Hasan, Gampong Pie, Banda Aceh, 23233, Indonesia; Physics Department, Syiah Kuala University, Banda Aceh, 23111, Indonesia; Geophysics Engineering Department, Syiah Kuala University, Indonesia; Aceh Besar Geophysical Station of BMKG Aceh, Mata'Ie, Aceh Besar, Aceh, Indonesia
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