1997-2008: 11 years of European-Mediterranean Regional Centroid Moment Tensors and their dissemination

Statistics – Computation

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7215 Earthquake Source Observations (1240), 7230 Seismicity And Tectonics (1207, 1217, 1240, 1242), 7294 Seismic Instruments And Networks (0935, 3025)

Scientific paper

The European-Mediterranean Regional Centroid Moment Tensor (RCMT) Catalog collects seismic moment tensor solutions that have been routinely computed since 1997 for earthquakes with moderate magnitude (4.5 < M < 5.5) in the Mediterranean region. This database represents an extension to smaller magnitudes of the Global CMT catalog (http://www.globalcmt.org). RCMT computation is based on the analysis of seismograms recorded at regional distances, and modeling of intermediate period surface waves. The Catalog is regularly updated a few months behind real time, and reports are published in Phys. Earth Planet. Int. and on the worldwide web (http://www.bo.ingv.it/RCMT). However, moment tensors can also be computed on the basis of data available in quasi-real time. Such preliminary solutions are available within one or a few hours after an earthquake occurs, and published as a Quick RCMTs. The European- Mediterranean RCMT Catalog currently includes more than 850 seismic moment tensor solutions, mainly located in the most seismically active areas, such as northern Greece and the Hellenic trench. In the consideration of the size of the Catalog, we developed a web-search interface that allows to query the SQL database on geographical, time and magnitudes (mb, Ms and Mw) ranges. The results can then be formatted and exported in various formats, or mapped directly on the web page (beach balls). Two important flags were introduced, allowing us to include in the database new events still in the preliminary stages of analysis or in need of further refinements. The first flag distinguishes Definitive and Quick solutions, while the second one categorizes events in 4 Quality levels on the basis of changes of centroid coordinates or when the depth needs to be fixed or when the double couple component is too big (Pondrelli et al., PEPI, 2006).

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