17:15 〜 19:15
[HDS10-P10] GO-EUREKA – GNSS-observation based European system for earthquake and tsunami hazard assessment from the ionosphere
キーワード：ionospheric assessment of natural disasters, ionospheric seismology, tsunami early warning, GNSS
Tsunami early warning systems (TEWS) require the following set of parameters in real-time or near-real-time (NRT) to assess the tsunami hazard: 1) the seismic source dimensions and the amplitude of the co-seismic crustal uplift to infer the tsunamigenic potential of the earthquake; 2) the wave heights and the speed of tsunami propagating in open water. However, despite recent developments, the NRT monitoring and forecasting of tsunamis in both near-field (<500 km from the source) and far-field (>500 km away from the source and trans-ocean propagation) remain very challenging, and even the most advanced seismo-geodetic methods regularly fail in the estimation of the tsunamigenic potential for large (Mw>8) earthquakes.
To resolve this fundamental challenge, since 2022, we have been developing a GNSS-observation-based European system for earthquake and tsunami risk assessment “GO-EUREKA”. The GO-EUREKA system will use data from ground-based and ship-based dual-frequency GNSS-receivers in order to assess a tsunamigenic potential of submarine earthquakes and, thus, to complement and to improve the existing tsunami early warning systems (TEWS). GO-EUREKA will use quasi-continuous observations of GNSS-based ionospheric total electron content (TEC). Once the data are collected and pre-processed by the module ALTRUIST (PI-M. Ravanelli), the following steps are performed for the NRT assessment of tsunami hazards: 1) automatic detection of co-seismic and co-tsunamic ionospheric disturbances (CSID and CTID, respectively); 2) inversion for earthquake magnitude and co-seismic crustal uplift from CSID (for near-field); 3) inversion of tsunami wave heights and the propagation speed based on analysis of features of CTID (for far-field).
This contribution will present recent developments for the future NRT tsunami hazard assessment from the ionospheric observations, including the NRT detection of CSID/CTID, NRT estimation of propagation speed of CSID/CTID, confirmation of the link between the detected disturbances and earthquakes/tsunamis, by newly developed rapid simulation tools and by NRT-compatible identification of the source of ionospheric disturbances.
To resolve this fundamental challenge, since 2022, we have been developing a GNSS-observation-based European system for earthquake and tsunami risk assessment “GO-EUREKA”. The GO-EUREKA system will use data from ground-based and ship-based dual-frequency GNSS-receivers in order to assess a tsunamigenic potential of submarine earthquakes and, thus, to complement and to improve the existing tsunami early warning systems (TEWS). GO-EUREKA will use quasi-continuous observations of GNSS-based ionospheric total electron content (TEC). Once the data are collected and pre-processed by the module ALTRUIST (PI-M. Ravanelli), the following steps are performed for the NRT assessment of tsunami hazards: 1) automatic detection of co-seismic and co-tsunamic ionospheric disturbances (CSID and CTID, respectively); 2) inversion for earthquake magnitude and co-seismic crustal uplift from CSID (for near-field); 3) inversion of tsunami wave heights and the propagation speed based on analysis of features of CTID (for far-field).
This contribution will present recent developments for the future NRT tsunami hazard assessment from the ionospheric observations, including the NRT detection of CSID/CTID, NRT estimation of propagation speed of CSID/CTID, confirmation of the link between the detected disturbances and earthquakes/tsunamis, by newly developed rapid simulation tools and by NRT-compatible identification of the source of ionospheric disturbances.