Major magnitude 6.7 earthquake - 96 km south of Okushiri Island, Hokkaido, Japan, on Tuesday, June 21, 1983 at 06:25 GMT

Most recent quakes Top 20 past 24 hrs Quakes in Japan

Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 501 km² (=194 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 39 km (24 mi).
Aftershocks typically occur during the weeks and months following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone.
The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the map below to verify).

Please wait while we search through millions of records.
This can take up to 20-30 seconds.

Click here to search our database for earlier earthquakes in the same area since 1900!