Abstract
We use GNSS data to simulate the early seismic source location of a M 4 event occurred in the island of Ischia, Italy. The study suggests that real-time GNSS data can support the seismic location system in the early stage of the emergency phase. We demonstrate that this very shallow earthquake, triggered significant displacements at a few stations in less than half an hour. Using exclusively GPS data, the first location of the hypocenter was possible with a latency of only 20 minutes. Early upgrades of the offset field in the first two hours confirm the source location confined within 1-2 km in the horizontal plane and less than 1 km depth.
Highlights
GPS data have proven the potential of early tsunami warning [Blewitt et al, 2007; Sobolev et al, 2007; Singh et al, 2012; Hoechner et al, 2013; Savastano et al, 2017]
In this study we investigate the capability for singleepoch GPS positioning to characterize small to medium earthquake sources
The seismic activity is rather low and generally with low magnitude, the historical record shows that Ischia island was struck by several earthquakes, a few of them causing severe damages and fatalities
Summary
GPS data have proven the potential of early tsunami warning [Blewitt et al, 2007; Sobolev et al, 2007; Singh et al, 2012; Hoechner et al, 2013; Savastano et al, 2017]. We assess the latency for the rapid seismic source location using only geodetic data for a recent event occurred on Ischia island. The seismic activity is rather low and generally with low magnitude, the historical record shows that Ischia island was struck by several earthquakes, a few of them causing severe damages and fatalities. The Neapolitan volcanic area is constantly monitored by the INGV - Osservatorio Vesuviano (INGVOV) institution It operates a geodetic monitoring system, which includes a continuous GPS network of 37 permanent stations [Tammaro et al 2013; De Martino et al 2014]. The proposed method is especially effective in volcanic or geothermal areas or for those events that are poorly constrained by the observing seismic network (e.g. on islands)
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