– German and Turkish scientists on Tuesday said they had pinpointed an extremely dangerous seismic zone less than 20 kilometers (12 miles) from the historic heart of Istanbul. Running under the Sea of Marmara just south of the city of some 15 million people, this segment of the notorious North Anatolian fault has been worryingly quiet in recent years, which may point to a buildup in tension, they wrote. “The block we identified reaches 10 kilometers (about six miles) deep along the fault zone and has displayed no seismic activity since measurements began over four years ago,” said Marco Bohnhoff, a professor at the German Research Centre for Geosciences (GFZ) in Potsdam, near Berlin. “This could be an indication that the expected Marmara earthquake could originate there.” The North Anatolian fault, created by the collision of the Anatolia Plate with the Eurasia Plate, runs 1,500 kilometers (950 miles) along northern…

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