GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 1.1 79 della sequenza del 1968 rispetto a quella 1993. Tuttavia da un punto di vista sismotettonico, i meccanismi focali (calcolati o tratti dalla bibliografia) mostrano sia per gli eventi del 1968 che per quelli più recenti una soluzione focale trascorrente con asse di massima compressione in direzione NW-SE. Questa è compatibile con la direzione di sigma 1 dello stress regionale (Eva and Solarino, 1998). Ringraziamenti Il recupero dei dati della sequenza del 1968 è stato possibile grazie alla collaborazione del Prof. Claudio Eva. Bibliografia Bossolasco, M., Cicconi, G., Eva, C. and Pasquale, V. (1972). La rete sismica dell’Istituto Geofisico di Genova e i primi risultati sulla sismotettonica delle Alpi Marittime ed Occidentali, e del Mar Ligure. Rivista Italiana di Geofisica, Bollettino dell’Associazione Geofisica Italiana. XXI, 5/6, 229-247. Cattaneo. M., Augliera, P., Spallarossa D. and Eva, C. (1997). ������������� �� ������������� ���������� �� ��������� Recostruction of seismogenetic structures by multiplet analysis: an example of Western Liguria, Italy. BSSA, 87,4, 971-986 Courboulex F., Deschamps A., Cattaneo M., Costi F., Deverchere J., Virieux J., Augliera P., Lanza V., Spallarossa D. (1998): Source study and tectonic implications of the 1995 Ventimiglia (border of Italy and France) earthquake (ML= 4.7). Tectonophysics , 290 (3/4) Eva, E. and Solarino, S. (1998). Variations of stress directions in the Western Alpine arc. Geoph. Journ. Internat., 135, 438-448 Larroque C., Scotti O. and Ioualalen M. (2012). Reappraisal of the 1887 Ligurian earthquake (western Mediterranean) from macroseismicity, active tectonics and tsunami modelling. Geophysical Journal International, 190, 87-94 Solarino S. (2005). The role of instrumental versus macroseismic locations for earthquakes of the last century: a discussion based on the seismicity of the North-Western Apennines (Italy). Annals of Geophysics, 48, 6, 923- 936 Waldhauser F. and W.L. Ellsworth (2000), Adouble-difference earthquake location algorithm: Method and application to the northern Hayward fault, Bull. Seism. Soc. Am., 90, 1353-1368. The 1933 Kos earthquake: a preliminary study V. Kouskouna 1 , K. Sesetyan 2 , M. Stucchi 3 1 Department of Geophysics and Geothermics, University of Athens, Greece 2 Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey 3 Eucentre Foundation, Pavia, Italy Introduction . The island of Kos and the Turkish coast near Bodrum were shaken on July 21 2017 by a shallow earthquake of Mw 6.6, with a focal depth of about 10 km. Its epicentre was located offshore NE of the island. The seismogenic source is a segment 16 km long of a E-W striking and south dipping (38�� ����� °� ����� ) fault located east of Kos, a westward extension of the Akyaka- Gökova fault in Muğla province (Fig. 1). Information on this earthquake is found in �������� Sözbilir et al. (2017), AFAD report (2017) and Lekkas et al. (2017). The earthquake is responsible for the loss of life of two tourists and 10 injured, as well as severe damage to the old buildings in the historic centre of Kos town, failures and subsidence to the town port and slight damage to a number of recent structures. Secondary effects were slope failures, land and coastal subsidence, liquefaction phenomena and a small tsunami that struck the port. In the past the area was shaken by few known earthquakes, the main of those happened in 1493 (Mw 6.9) and 1933 (Mw 6.5). The first one is known from the studies of Guidoboni and Comastri (2005), for which we have seven macroseismic data points. The one of 23 April, 1933 took place in a time-window when the Dodecanese was under Italian administration, with Rhodes as capital, and shook an area already damaged by the great, 1926 Rhodes earthquake. Fig. 2 shows a sketch of the early epicentral location attempts by of the