Options
Department of Geophysics, School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece
3 results
Now showing 1 - 3 of 3
- PublicationOpen AccessSeismic zonation of the Dead Sea Transform Fault area(2000-02)
; ; ; ;Khair, K.; Department of Geology, American University of Beirut, Lebanon ;Karakaisis, G. F.; Geophysics Laboratory, Aristotle University of Thessaloniki, Greece ;Papadimitriou, E. E.; Geophysics Laboratory, Aristotle University of Thessaloniki, Greece; ; The Dead Sea Transform Fault constitutes the northwestern boundary of the Arabian plate, accommodating the plate’s lateral movement relative to the African plate. A complete and homogeneous catalogue of historical earthquakes has been compiled and used in the subdivision of the fault area into the following segments: 1) Araba segment, which extends along Wadi Araba and the southernmost part of the Dead Sea (29.5°-31.3°N) and trends SSW-NNE with scarce historical and instrumental seismicity; 2) Jordan-valley segment, which extends along the central and northern parts of the Dead Sea and the Jordan valley to the Huleh depression (31.3°-33.1° N) and trends S-N with moderate historical seismicity; 3) Beqa’a segment, which extends along the western margin of the Beqa’a valley in Lebanon (33.1°-34.5°N) and trends SSW-NNE with strong historical seismicity; 4) El-Ghab segment, which extends along the eastern flank of the coastal mountain range of Syria (34.5°-35.8°N) and trends S-N with moderate historical seismicity; 5) Karasu segment, which extends along the Karasu valley in SE Turkey (35.8°-37.3°N) and trends SSW-NNE, exhibiting the strongest historical seismicity of the area. Probabilities for the generation of strong (M > 6.0) earthquakes in these segments during the next decade are given, by the application of the regional time and magnitude predictable model.459 2195 - PublicationOpen AccessMicroearthquake study of the broader Thessaloniki area (Northern Greece)(2006-08)
; ; ; ; ; ; ;Paradisopoulou, P. M.; Department of Geophysics, School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece ;Karakostas, V. G.; Department of Geophysics, School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece ;Papadimitriou, E. E.; Department of Geophysics, School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece ;Tranos, M. D.; Department of Geology, School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece ;Papazachos, C. B.; Department of Geophysics, School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece ;Karakaisis, G. F.; Department of Geophysics, School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece; ;; ; ; A temporary network of twelve portable digital seismological stations was operated around the city of Thessaloniki (Northern Greece) for a period of 19 months (from July 2001 to April 2002 and from October 2002 to August 2003), providing data that enabled the study of the interconnection between microseismicity and active tectonics in the area. During the operation period 277 microearthquakes that were recorded in more than four stations were accurately located and 64 fault plane solutions were determined. Seismic activity is associated with ENE-WSW, E-W and ESE-WNW striking normal faults and is nearly confined to the first 15 km, thus defining the seismogenic layer in the study area. The mean orientation of the axis of maximum extension (T-axis) is NS to NNE-SSW, determined from fault plane solutions, in agreement with the regional extensional stress pattern, which strikes perpendicular to the orientation of the main WNW-ESE active faults of the area.200 368 - PublicationOpen AccessOn the validity of the regional time and magnitude predictable model in China(1999-10)
; ; ; ; ;Qin, C.; Laboratory of Geophysics, University of Thessaloniki, Greece ;Papadimitriou, E. E.; Laboratory of Geophysics, University of Thessaloniki, Greece ;Papazachos, B. C.; Laboratory of Geophysics, University of Thessaloniki, Greece ;Karakaisis, G. F.; Laboratory of Geophysics, University of Thessaloniki, Greece; ; ; A simplified form of the "regional time and magnitude predictable model" gives the time interval, T, between two successive mainshocks in a region and the magnitude, Mf, of the following mainshock by the relations: logT=cMP+a; Mf=CMp+A, where Mp is the magnitude of the preceding mainshock, a, A are constants which depend on the minimum considered mainshock and on the region's tectonic loading (moment rate). The physical meaning of the model is that the larger the magnitude of the preceding main shock, Mp, the longer the time, T, will be till the occurrence of the next one and the smaller its magnitude, Mf. This means that parameters c and C are positive and negative, respectively, when the model has been found valid for a certain area. In order to examine if the above model is appropriate to describe the seismicity behavior in the area of China, a detailed inspection was carried out aiming to show if the estimated values of parameters c and C favor the model. The results show that c tends to the global value 0.33, obtained by Papazachos and Papadimitriou (1997), and that C tends to be within the range [-0.30, -0.23]. The results, which favored the model, greatly outnumber those that do not follow it, the latter being concentrated around the boundaries of the seismically active regions. It is concluded that the results, which favor the model, obviously dominate the whole territory of China.183 190