A big earthquake occurred south of Istanbul in the summer of 2016, but it was so slow that nobody noticed. The earthquake, which took place at mid-crustal depth, lasted more than fifty days. Only a novel processing technique applied to data from special borehole strainmeter instruments allowed researchers to identify the ultra-slow quake below the Sea of Marmara.
from Latest Science News -- ScienceDaily http://bit.ly/2sPeXtI
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