Madlazim
The purpose of this research was to use the Joko Tingkir software, to measure rapidly tsunamifaulting parameters of the March 2, 2016, earthquake (Mw = 7.8) off the coast of Southern Sumatra. The five parameters that needed measurement were the quake’s rupture duration (Tdur), the dominant period Td), the exceedance duration of 50 seconds (T50Ex), the multiplication between rupture duration and the dominant period (Tdur x Td), and the multiplication exceedance duration and dominant period (T50Ex x Td). The methodology of measuring these parameters is based on the direct analysis of the locally measured seismic broadband vertical components, without inversion. The seismographic data used for this study was obtained from 18 seismic stations of the BMKG network. The tsunami parameters thresholds used by the Joko Tingkir software were: Tdur = 65 s, Td = 10 s, T50Ex = 1, Tdur x Td =650 s2 and T50Ex x Td = 10 s. Earthquakes that have three or more parameters that are equal or bigger than these threshold values, are known to be associated with tsunami generation. Rapid measurements of parameters - in less than 4 minutes after the quake’s origin time - that have values of Tdur = 65.70, Td = 3.60, T50Ex = 0.13, Tdur x T50Ex = 234.00 and T50Ex x Td = 0.48, do not typically generate tsunamis. The authors sincerely thank the Indonesian Agency for Geophysics, Climatology and Meteorology (BMKG) in Jakarta and the GLOBAL CMT for providing full support for the data used in this work. © 2017 -TSUNAMI SOCIETY INTERNATIONAL.
Physics Department, Mathematics and Science Faculty, Universitas Negeri Surabaya, Indonesia
