Evan Bush is a science reporter for NBC News.
After a 7.1-magnitude earthquake shook southern islands in Japan on Thursday, the country’s meteorological agency sent out an ominous warning: Another, larger earthquake could be coming, and the risk will be especially high over the next week. In the first “megaquake advisory” it has ever issued, the agency said that the risk of strong shaking and a tsunami are greater than usual on the Nankai Trough, a subduction zone with the potential to produce magnitude 8 or 9 temblors.
The phenomenon is due to the segmented nature of the fault; when one segment slips, it can stress another. Thursday’s magnitude-7.1 earthquake took place on or near the subduction zone, according to the United States Geological Survey. Harold Tobin, a University of Washington professor who has studied the Nankai Trough, said the magnitude-7.1 quake took place in a segment that shakes more frequently than others.
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