Recently a 9.0 earthquake hit Japan. There as much devastation and sadness there. around 20,000 were estimated dead and more than 100,000 in shelters. Scientists were confused because younger tectonic plates should create bigger quakes because they were harder to push to the center of the Earth, but the plate that produced the 9.0 quake in Japan was one of the oldest plates.
Also scientists know that there are some unknown faults that could create earthquakes. There could be thousands of faults that could produce deadly earthquakes. Not only are some of the faults unknown some are also underestimated. Some are expected to make lower quakes like 1.0 to 3.0 but they can actually produce up to 7.0 or something higher.
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