EFFECTIVE TSUNAMI EARLY WARNING USING THE PRODUCT OF P-WAVE DOMINANT PERIOD AND SOURCE RUPTURE DURATION OF MORE THAN 50 SECONDS

Abstract

In this study, we used a tsunami-faulting model, where the discriminant for tsunami potential is the dominant period T! d of P-waves times the rupture duration of an earthquake T! 50ex of more than 50 seconds. The product of T! dT50ex was estimated in real time and validated with Tsunami Event Validity (TEV) from NOAA/WDC database. The T! dT50ex discriminant was calculated using a direct procedure for the vertical component of P-wave seismograms velocity. The data were obtained from 51 earthquakes that occurred during 2011-2020 with magnitudes of 6.5 ! ≤ Mw ≤ 8.6, containing 19 strike-slips fault, 11 normal-fault and 21 reverse-fault earthquakes. The results suggest that earthquakes are said to be potential to generate tsunamis when T! dT50ex ≥ 10 s is satisfied. In summary, T! dT50ex is proved to be an efective tsunami discriminant to detect the presence of a tsunami wave after about 4 minutes an earthquake occurs, implying that this is (can be accessed at http://prediksi-tsunami.unesa.ac.id/www/index.html) a useful parameter for rapid and accurate tsunami early warning.

Keywords

• tsunami early warning
• p-wave dominant period
• source rupture duration more than 50 s
• tsunami discriminant