TSUNAMI FAULTING MODEL ANALYSIS FOR THE 30 OCTOBER 2020 NORMAL EARTHQUAKE OCCURRED IN IZMIR-TURKEY

Abstract

This study aims to analyse the Mw 7.0 normal faulting type earthquake that occurred on October 30, 2020, in Izmir-Turkey. After the earthquake, a tsunami was followed with a maximum water level of 3.8 meters in the Aegean Sea. The used method in this study is the measurement of the tsunami faulting model parameters by using a direct procedure. The measured tsunami parameters are the dominance period (Td), rupture duration (Tdur), and rupture duration more than 50 seconds (T50Ex) as well as the results of the multiplication between Td and T50Ex (TdT50Ex). In this study, we used seismogram velocity of vertical component recorded by the Global Seismographic Networks (GSN) network stations and the GEOFON (GE) network with an epicenter distance of 0 to 40°, totaling 66 seismic stations. Based on the measurement results, the tsunami discriminants Tdur = 65.11 seconds, Td = 9.28 seconds, T50Ex = 1.43 and TdT50Ex = 13.27 seconds > 10 seconds (threshold). The value of the tsunami discriminants TdT50Ex that exceeds this threshold strengthens that the normal type earthquake is the cause of the tsunami.

Keywords

• normal earthquake
• dominant period
• rupture duration
• rupture duration more than 50 seconds
• tsunami faulting model