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tool For Rapid autOmatic Generation of seismic bulletin

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Academic Spin-Off Physics Department – University of Naples Federico II tool aut or apid matic eneration of

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Here we present the real-time automated procedures and the analyses performed by the software package, which is essentially a chain of different modules, each of them aimed at the automatic computation of a specific source parameter. The P-wave arrival times are first detected on the real-time streaming of data and then the software performs the phase association and earthquake binding. As soon as an event is automatically detected by the binder, the earthquake location coordinates and the origin time are rapidly estimated, using a probabilistic, non-linear, exploration algorithm. Then, the software is able to automatically provide three different magnitude estimates: • The local magnitude (Ml) is computed, using the peak-to-peak amplitude of the equivalent Wood-Anderson displacement recordings. • The moment magnitude (Mw) is then estimated from the inversion of displacement spectra. • The duration magnitude (Md) is rapidly computed, based on a simple and automatic measurement of the seismic wave coda duration. Starting from the magnitude estimates, other relevant pieces of information are also computed, such as the corner frequency, the seismic moment, the source radius and the seismic energy. The ground-shaking maps on a Google map are produced, for: • peak ground acceleration (PGA) • peak ground velocity (PGV) • instrumental intensity (in SHAKEMAP® format) • plot of the measured peak ground values. Furthermore, based on a specific decisional scheme, the automatic discrimination between local earthquakes occurred within the network and regional/teleseismic events occurred outside the network is performed. Finally, for largest events, if a consistent number of P-wave polarity reading are available, the focal mechanism is also computed.

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For each event, all of the available pieces of information are stored in a local database and the results of the automatic analyses are published on an interactive web page. “The Bulletin” shows a map with event location and stations, as well as a table listing all the events, with the associated parameters. The catalogue fields are: • event ID • origin date and time • Latitude and longitude • Depth • Ml • Mw • Md • Number of triggered stations • S-displacement spectra • shaking maps Some of these entries also provide additional information, such as the focal mechanism (when available). The picked traces are uploaded in the database and from the web interface of the Bulletin the traces can be download for more specific analysis. This innovative software represents a smart solution, with a friendly and interactive interface, for high-level analysis of seismic data analysis and it may represent a relevant tool not only for seismologists, but also for nonexpert external users who are interested in the seismological data. The software is a valid tool for the automatic analysis of the background seismicity at different time scales and can be a relevant tool for the monitoring of both natural and induced seismicity.

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Academic Spin-Off Physics Department – University of Naples Federico II Contact: RISS s.r.l. Address: Dipartimento di Fisica Univ. degli Studi di Napoli "Federico II" Via Cinthia 26 80126 Napoli Italy Phone: Email: Web: +39 081 6 79929 +39 081 6 76810 info@riss-srl.com http://www.riss-srl.com

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