L. Cholifah, D.A. Puspitasari, B.M.P. Mahanani, T. Prastowo
The primary aim of this study is to estimate earthquake duration magnitude M d from local magnitude M l for a set of seismo-tectonic events in North Sulawesi, Central Sulawesi, and West Sulawesi during 2008-2015 years. The data were collected from Webdc3, comprising datasets of magnitudes in the three regions of interest. The data were firstly used to develop corresponding local magnitudes, after which these magnitudes were analyzed to parameterize duration magnitude. Using a simple parametric equation (adopted from relevant work) directly linked M d to M l, M d = 1.05M l - 0.17 + c where c represented a correction factor, we found that the equation is applicable to moderate events considered with no significant difference in the calculated values whether or not c was used. For completeness, we compared the M d values in the three provinces with M w scales provided by the Global CMT catalogue as the reference. The results show that the obtained values of M d are in good agreement with the magnitude reference of M w within ± 0.2 units in magnitude. The results suggest that empirical relations between M d and M l used here are appropriate for rapid and accurate magnitude determination to improve seismic hazard assessment in the three provinces. © Published under licence by IOP Publishing Ltd.
Physics Department, Postgraduate Program, Institut Teknologi Sepuluh Nopember, Kampus ITS Keputih, Sukolilo, Surabaya, 60111, Indonesia; Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya, Kampus Unesa Ketintang, Surabaya, 60231, Indonesia; Center for Earth Science Studies, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya, Kampus Unesa Ketintang, Surabaya, 60231, Indonesia
