MONTAGNER , Jean-Paul

SUMMARY Since gravity changes propagate at the speed of light, gravity perturbations induced by earthquake deformation have the potential to enable faster alerts than the current earthquake early warning systems based on seismic waves. Additionally, for large earthquakes (Mw > 8), gravity signals may allow for a more reliable magnitude...

A recent work by Kimura et al. (Earth Planets Space 71:27, 2019. https://doi.org/10.1186/s40623-019-1006-x ) (hereafter referred to as K19) claims to provide the first observational constraints on the prompt elastogravity signals (PEGS) induced by an earthquake. To make their claim, the authors argue that the observations shown in Vallée et al....

Prompt ElastoGravity Signals (PEGS) come from gravitational disturbances associated with the redistribution of the mass carried by the elastic waves. As such, they are the first deformation signals observable after an earthquake. Today, PEGS have been clearly observed with (very) broadband seismometers for 6 large magnitude earthquakes (Mw...

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