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GNSS total variometric approach: first demonstration of a tool for real-time tsunami genesis estimation

Authors
  • Ravanelli, Michela1
  • Occhipinti, Giovanni2, 3
  • Savastano, Giorgio4, 5
  • Komjathy, Attila4
  • Shume, Esayas B.4, 6
  • Crespi, Mattia1
  • 1 Sapienza University of Rome, via Eudossiana 18, Rome, 00184, Italy , Rome (Italy)
  • 2 Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, 75005, France , Paris (France)
  • 3 Institut Universitaire de France, Paris, France , Paris (France)
  • 4 Jet Propulsion Laboratory, 4800 Oak Grove Dr, Pasadena, CA, 91109, USA , Pasadena (United States)
  • 5 Spire Global, Inc., 33 Rue Sainte-Zithe, Luxembourg, 2763, Luxembourg , Luxembourg (Luxembourg)
  • 6 California Institute of Technology, 1200 E California Blvd, Pasadena, CA, 91125, USA , Pasadena (United States)
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
Feb 04, 2021
Volume
11
Issue
1
Identifiers
DOI: 10.1038/s41598-021-82532-6
Source
Springer Nature
License
Green

Abstract

Global Navigation Satellite System (GNSS) is used in seismology to study the ground displacements as well as to monitor the ionospheric total electron content (TEC) perturbations following seismic events. The aim of this work is to combine these two observations in one real-time method based on the Total Variometric Approach (TVA) to include the GNSS real-time data stream in future warning systems and tsunami genesis estimation observing both, ground motion and TEC. Our TVA couples together the Variometric Approach for Displacement Analysis Stand-alone Engine (VADASE) with the Variometric Approach for Real-Time Ionosphere Observation (VARION) algorithms. We apply the TVA to the Mw 8.3 Illapel earthquake, that occurred in Chile on September 16, 2015, and we demonstrate the coherence of the earthquake ground shaking and the TEC perturbation by using the same GNSS data stream in a real-time scenario. Nominally, we also highlight a stronger kinetic energy released in the north of the epicenter and visible in both, the ground motion and the TEC perturbation detect at 30 s and around 9.5 min after the rupture respectively. The high spatial resolution of ionospheric TEC measurement seems to match with the extent of the seismic source. The GNSS data stream by TVA of both the ground and ionospheric measurement opens today new perspectives to real-time warning systems for tsunami genesis estimation.

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