We are proud to announce that the first 2025 Webinar of the International Meridian Circle Program – Europa Africa Pacific (IMCP-EAP) will kindly be given by
Dr. Elvira Astafyeva
Directeur de recherche CNRS, Institut de Physique du Globe de Paris (IPGP), Paris, France
Wednesday, February 19th, 2025
Subject:
Ionosphere – a new tool for assessment of natural hazard events?
Abstract:
The ionosphere is a part the Earth’s atmosphere where the concentration of electrically charged particles is enhanced, i.e., at 200-400 km of altitude. However, despite being high above the surface, the ionosphere is sensible to near-surface and low atmosphere events such as earthquakes, tsunamis, volcanic eruptions, explosions, rocket launches, etc. Earthquakes and tsunamis generate acoustic and gravity waves that propagate upward and trigger ionospheric perturbations that are often called co-seismic and co-tsunamic ionospheric disturbances (CSID and CTID, respectively). Such ionospheric disturbances carry the information about the source that generated them. Consequently, we can use ionospheric measurements in order to reconstruct information about the source. However, up to now there are no seismo-ionospheric methods that can perform in near-real-time (NRT).
This contribution aims to present recent advances in the area of ionospheric detection of earthquakes, volcanic eruptions and tsunamis, and to present new developments toward NRT tsunami risk assessment from the ionosphere.
Time: Feb 19, 2025 03:00 PM Paris
Zoom link (Meeting ID: 914 4776 3460, Passcode: aYU7Pf)
(Transmis par Michel Blanc)