Coseismic displacements on Ischia island, real-time GPS positioning constraints on earthquake source location

Roberto Devoti, Prospero De Martino, Grazia Pietrantonio, Mario Dolce


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.


fast earthquake location; kinematic GPS solution; transient signal

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X