An empirical magnitude estimation for 7.3 Mw Kermanshah earthquake of 11th December 2017 using Period and Amplitude parameters

The deadliest earthquake of 2017, the Mw 7.3 Kermanshah earthquake, proves the need of an earthquake early warning system for Iran. The ability of rapidly estimating an earthquake magnitude from first part of the P phase is a factor than can help building an earthquake early warning system, as in many countries. In this paper, magnitude of the 7.3 Mw earthquake which occurred on the border of Iran and Iraq on 11th November of 2017 is estimated using the period (Tc, Tpmax, Tlog) and amplitude (Pd) regressions extracted for northwest of Iran. They could successfully estimate the magnitude of this earthquake with the values, 6.9, 6.9, 8.3 and 6.6 from the parameters Tc, Tpmax, Tlog and Pd respectively using only the first 2.5 seconds of initial part of P-wave (3 seconds in case of using Tlog and Tpmax). The largest magnitude error using these parameters is 0.6 which is normal for earthquake early warning purposes