Class Note for GEOS 218 with Professor Davis at UA
Class Note for GEOS 218 with Professor Davis at UA
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This 8 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Arizona taught by a professor in Fall. Since its upload, it has received 16 views.
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Date Created: 02/06/15
Lecture 9 Plate Tectonics of the Eastern Mediterranean Geosciences 218 Geological Disasters and Society George H Davis Regents Professor Department of Geosciences Plate Picture Eastern Mediterranean lt3 Black Sea l 20 mmyr Eurasian Plate The arrows are velocity vectors derived through GPS measurements over time Note velocity scale upper left Explanation 20quot 25quot am 35quot 40 45 next slide TakeAway Messages Plates Map Arabian plate moving north 20 mmyr African plate moving north 10 mmyr Anatolia squeezed between Arabian plate and Black Sea escapes westward Northern boundary of Anatolia is North Anatolia transform fault zone Africa subducts under Eurasia at Crete and sucks Greece et al southward causing stretching Detailed look at Velocity Vectors Greece Note that each surveyed point in southern Greece is moving N39 mmyr to the SW The barbedsymbol that passes south of Crete is the convergent subduction boundary between the Eurasian plate to the north and the African plate to the south This is a map of some of the earthquakes in the Aegean region evidence of crustal stretching in Greece and righthanded strike slip along North Anatolia fault zone Greece contains deep record of earthquake damage not shifts of drums in columns Earthquakes in Ancient Athens Seismic damage at the 5th century BC Thesiou temp1e in Athens Ian Stewart This is the entrance to Mycenae Greece the home of Agamemnon The rock wall on the right is a fault surface Note the fault lines striations This is an exposure of a normal fault near Thermopolyae Note the striations The striations lines reveal that the mountain is moving earthquake by earthquake up and to the left and that the valley is moving down and to the right The surface is smooth because of frictional polish which accompanies each earthquake The polish forms well below the surface and later the surface becomes exposed as the footwall is raised to the surface This is a View looking up the polished and lineated fault surface Note the curve in the lines The curve in the lines reveals that there was a slight shift in the direction of the fault movement Jackson anndKensie who described this surface believe that the surface is a product of about 50 to 100 earthquakes This is the nature of normal faulting under the Gulf of Corinth The circles are earthquake hypocenters Note that the faults progress in age from left to right from older to younger The present location of the foundation of this 2nd century Christian church makes it clear that some coastline along Greece is subsiding because of faulting in response to crustal stretching This map shows clearly the location of the North Anatolian Fault the epicenter of the Izmit earthquake the plates and the plate boundaries mm I ANATOLIA Students from Middle Eastern Technical University Ankara on way to Izmit Tent city erected by French Red Cross in aftermath of Izmit earthquake Inadequater engineered buildings sitting on wet soils pancaked during earthquake The building in the background juts out to the right because of right handed strike slip faulting during the Izmit earthquake View is perpendicular to the fault which goes between buildings in foreground and background These are fault zones in soil blanket Faulting took place during the Izmit earthquake In class GHD simulated the formation ofthis deformation by making cuts in apiece ofpaper The cuts were overlapping and en echelon and discontinuous Just a little right handed movement popped up these structures The lower map shows the NAFZ The upper diagram shows in color the eastwest lengths of earthquake ruptures in past The heights of the color swaths show amt of fault displacement Note that earthquakes progress oldest to youngest east to west Wm v39o at 5mm 1 u Arabian plate converges northeastward to form the Zagros fold and thrust belt Note each of the plate boundaries http szzs gee comell edusynzwelcome html Geologic map of the Zagros The red splotches are huge saltcored folds gt35 N 35 N 7 saw ZO N Aerial photo of huge saltcored fold in the Zagros fold and thrust belt Geologic cross sections of the Zagros Black circles are earthquakes Note thrust faults most of which are blind Note folds above the thrusts
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