The Japanese quake occurred at 9:21 a.m. (0021 GMT). The USGS initially classified its magnitude as a 7.2, but later reduced it.
The quake-s epicenter was offshore, about 80 miles (125 km) south-southwest of Kushiro on the northern Japanese island of Hokkaido, and about 21.7 miles (35 km) below the Earth-s surface.
The Indonesian quake was much deeper — about 57.9 miles (93 km). In general, earthquakes centered closer to the Earth-s surface produce stronger shaking and can cause more damage than those further underground.
Earthquakes between magnitude 6.0 and 6.9 are considered “strong” by the USGS.
The National Oceanic and Atmospheric Administration said neither quake posed a Pacific-wide tsunami threat. However, “earthquakes of this size sometimes generate local tsunamis that can be destructive along coasts located within a hundred kilometers of the earthquake epicenter,” the administration said.
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