Earthquake Early Warning System in Israel—Towards an Operational Stage

The Geological Survey of Israel has upgraded and expanded the national Israeli Seismic Network (ISN), with more than 110 stations country-wide, as part implementation a governmental decision to build Earthquake Early Warning (EEW) system named TRUAA. This seismic network exhibits high station density fast telemetry. are distributed mainly along main fault systems, Dead Sea Transform, Carmel-Zfira Fault, which may potentially produce M w 7.5 earthquakes. recently entered limited operational phase, allowing for initial performance estimation. Real-time during eight months operation (41 earthquakes) matches expectations. Alert delays (interval between origin-time alert time) reduced low 3 s, source parameter errorstatistics within expected values found in previous works using historical data playbacks. An evolutionary policy is implemented based on magnitude threshold Mw 4.2 peak ground accelerations exceeding 2 cm/s . A comparison different motion prediction equations (GMPE) presented earthquakes from California median values. analysis shows that theoretical GMPE produced best agreement observed motions, less bias lower uncertainties. this was improve when an earthquake specific stress drop implemented.