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The design of critical facilities needs a targeted computation of the expected ground motion levels. The Trans Adriatic Pipeline (TAP) is the pipeline that transports natural gas from the Greek-Turkish border, through Greece and Albania, to Italy. We present here the probabilistic seismic hazard analysis (PSHA) that we performed for this facility, and the deaggregation of the results, aiming to identify the dominant seismic sources for a selected site along the Albanian coast, where one of the two main compressor stations is located. PSHA is based on an articulated logic tree of twenty branches, consisting of two models for source, seismicity, estimation of the maximum magnitude, and ground motion. The area with the highest hazard occurs along the Adriatic coast of Albania (PGA between 0.8 and 0.9 g on rock for a return period of 2475 years), while strong ground motions are also expected to the north of Thessaloniki, Kavala, in the southern Alexandroupolis area, as well as at the border between Greece and Turkey. The earthquakes contributing most to the hazard of the test site at high and low frequencies (1 and 5 Hz) and the corresponding design events for the TAP infrastructure have been identified as local quakes with MW 6.6 and 6.0, respectively. [ABSTRACT FROM AUTHOR]

The SEAHELLARC project, supported by the European Commission, aims at evaluating and computing seismic hazard and risk, as well as modelling tsunamis for the town of Pylos, in the western Peloponnese. For this purpose, a new seismogenic zonation has been developed for the Pylos area, and broader region, and the most updated seismic hazard assessment is provided. The present paper describes preliminary seismic hazard computations performed with the scope of testing the improvements made during the project. In particular, the influence of an updated version of the Greek earthquake catalogue and of a new seismogenic zonation for the Pylos region are presented. The difference obtained for the expected ground motion, with a 475-year return period, in the town of Pylos is not significantly big (it only decreases from 0.63 to 0.56 g using literature data or the new ones, respectively). Conversely, greater differences concern the Island of Zakinthos. [ABSTRACT FROM AUTHOR]