GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 1.1 137 The picker provides consistent and reliable automatic first arrival P picks together with a pick- quality estimate. Through the collection of tests and features the picker is able to discriminate and evaluate the physical error applying a classification algorithm. Subsequently, high-quality automatic picks of all well-locatable earthquakes are used to calculate a minimum 1D P-wave velocity model for the region with appropriate stations corrections. We run the VELEST code (Kissling at al., 1988) to detect timing error, mis-picks and metadata problem in our dataset. Finally, all the events are relocated with the NonLinLoc algorithm in combination with the updated 1D model. We compare our locations with existing earthquake catalogs (ISC, EMSC, national catalogs) to check the completeness and the consistency. Once the catalog is ready, downstream products will be delivered: calculation of the magnitude with different relations, moment tensors solution for events with M>3.5 and 3D local earthquake tomography making use of the detected seismic phases and their uncertainties. Discussion. The proposed procedure and the unique dataset represent an important step towards the uniform earthquake catalog for the entire greater Alpine region using the AASN. The final catalog for the 3 years of the AASN operation is still a work in progress. However, the first results are quite promising. The final research catalog, with uncertainties associated, could be at the basis to compare the different national earthquake catalogs, triggering, discussions Fig. 1 - Stations used for the AlpArray research catalog. Gray line represents the extension of the AlpArray region.