Insights into Mechanical Properties of the 1980 Irpinia Fault System from the Analysis of a Seismic Sequence

Seismic sequences are a powerful tool to locally infer geometrical and mechanical properties of faults fault systems. In this study, we provided detailed location characterization events the 3–7 July 2020 Irpinia sequence (southern Italy) that occurred at northern tip main segment ruptured during 1980 earthquake. Using an autocorrelation technique, detected more than 340 within sequence, with local magnitude ranging between ?0.5 3.0. We thus double difference locations, source parameter estimation, focal mechanisms determination for largest quality events. found asperity size about 800 m, along structure having strike compatible one segments earthquake, dip 50–55° depth 10.5–12 km 60–65° shallower depths (7.5–9 km). Low stress drop release (average 0.64 MPa) indicates fluid-driven initiation mechanism sequence. also evaluated performance earthquake early warning systems running in real-time retrieving minimum blind zone area 15 km.