An earthquake magnitude 6,1 epicentred at 35.617°N, 140.452°E, 64km east of Tokyo struck at a depth of 42,9km at 13:37 on April 21th. The quake was followed by a number of aftershocks, the largest of which measured 5,6. (USGS)
According to Fire-Earth site forecast, the mean distance of epicenters for significant shocks striking near Boso Triple Junction (Sagami Trough), on the east coast of Honshu, are moving closer to Tokyo area, making Chiba City a highly probable target for a large quake (Magnitude > 8.4Mw).
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