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    Fault specific GIS based seismic hazard maps for the Attica Region, Greece

    Deligiannakis, G. and Papanikolaou, I.D. and Roberts, Gerald P. (2018) Fault specific GIS based seismic hazard maps for the Attica Region, Greece. Geomorphology 306 , pp. 264-282. ISSN 0169-555X.

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    Abstract

    Traditional seismic hazard assessment methods are based on the historical seismic records for the calculation of an annual probability of exceedance for a particular ground motion level. A new fault specific seismic hazard assessment method is presented, in order to address problems related to the incompleteness and the inhomogeneity of the historical records and to obtain higher spatial resolution of hazard. This method is applied to the region of Attica, which is the most densely populated area in Greece, as nearly half of the country’s population lives in Athens and its surrounding suburbs, in Greater Athens Area. The methodology is based on a database of 22 active faults that could cause damage to Attica in case of seismic rupture. This database provides information about the faults slip rates, lengths and expected magnitudes. The final output of this method are four fault specific seismic hazard maps, showing the recurrence of expected intensities that each locality in the map has been shaken at. These maps offer a high spatial resolution, as they consider the surface geology. Despite the fact that almost half of the Attica region lies on the lowest seismic risk zone according to the official seismic hazard zonation of Greece, different localities have repeatedly experienced strong ground motions during the last 15 kyrs. Moreover, the maximum recurrence for each intensity occurs in different localities across Attica. Highest recurrence for intensity VII (151-156 times over 15 kyrs, or up to 96 year return period) is observed in the central part of the Athens basin. The maximum intensity VIII recurrence (114 times over 15 kyrs, or up to 131 year return period) is observed in the western part of Attica, while the maximum intensity IX (73-77/15kyrs, or 195 year return period) and X (25-29/15kyrs, or 517 year return period) recurrences are observed near the South Alkyonides fault system, which dominates the strong ground motions hazard in the western part of the Attica mainland.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Athens, Active faults, Slip rates, Faults database
    School: School of Science > Earth and Planetary Sciences
    Depositing User: Gerald Roberts
    Date Deposited: 26 Jun 2017 14:01
    Last Modified: 09 Feb 2021 14:02
    URI: https://eprints.bbk.ac.uk/id/eprint/19047

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