[M-TT39] インフラサウンド及び関連波動が繋ぐ多圏融合地球物理学の新描像

[MTT39-02] Advanced Tsunami Early Warning: A Seismoacoustic Approach for the Southern Mediterranean

*Hany S. Elbehiri^1,2、Tatsuhiko Hara³、Islam Hamama²、Yasuhiro Nishikawa¹、Masa-yuki Yamamoto¹ (1.School of Systems Engineering, Kochi University of Technology、2.Egyptian National Data Center, National Research Institute of Astronomy and Geophysics、3.International Institute of Seismology and Earthquake Engineering, Building Research Institute)

キーワード：Seismoacoustic , Tsunami Early Warning Systems (TEWS), Earthquakes, Mediterranean Sea, Infrasound

The Tsunami Early Warning System (TEWS) starts with issuing alerts and ends with saving lives. This research aims to produce the TEWS for Egypt. The catalog contains 32 earthquakes with a magnitude of Mww more than 5.5 in the eastern Mediterranean Sea between 2012 and 2023, that had been analyzed automatically by SeisComP3 software to compute different magnitude types. Depending on the Standard Operational Procedures (SOP), the initial alert message is estimated for mb, mB, and Mwp magnitudes. Comparing magnitude types for the first alert, Mwp magnitude was the most effective for tsunami countermeasures in Egypt within eleven minutes, as Mw(Mwp) produced an 87% accurate alert compared to the six minutes, which was 84.3%. Furthermore, the Tsunami Travel Time (TTT) for the proposed tsunami wave arrives on Egyptian coasts within 65 minutes. Moreover, reviewing the relevant literature on TEWS, the second alert message is produced after the magnitude confirmation and sea level observation. This study suggests the capability of integrating infrasound technology, as large earthquakes have been recorded with acoustic waves. However, the largest earthquake with magnitude Mww = 7 on 30 October 2020 was not detected with infrasound, which contributed to the infrasound propagation modeling that confirmed the reason for recorded and non-recorded signals.