Regional centroid moment tensor solutions in Cyprus from 1977 to the present and seismotectonic implications |
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Authors: | P Imprescia S Pondrelli G Vannucci S Gresta |
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Institution: | (1) Dipartimento di Scienze Geologiche, Universit? di Catania, Corso Italia 55, 95129 Catania, Italy;(2) INGV—Sezione di Bologna, Via Donato Creti 12, 40128 Bologna, Italy |
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Abstract: | We analyzed digital seismic records in order to extend back in time the catalog of regional centroid moment tensors (RCMTs)
for the Cyprus region. We applied the analysis and inversion methodology also used for the present-day seismicity on seismograms
recorded at regional distance. We computed 18 new regional CMTs of earthquakes of moderate magnitude (4.8 ≤ M ≤ 5.5) which occurred in the Cyprus region for the time span 1977–1996. These new focal mechanisms improved the knowledge
given by the previously computed solutions carried out by other institutions, as well as the dataset of available earthquake
source parameters. The complete focal mechanism database contributed to better define the deformation styles in the study
area and to obtain a detailed characterization of the geodynamics of the Cyprus area. New RCMTs support the hypothesis that
Cyprus is located in the middle of the transition area from subduction to continental collision along the Africa–Arabian–Eurasian
boundary. In particular, data confirm (a) this transition zone is strictly located west of Cyprus, probably related to a tear
in the subduction system, and (b) the still active compression in the Cyprus Arc can be seen as a starting point of the continental
collision eastward. |
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