The 2015 Ogasawara earthquake was a 7.9 magnitude earthquake which struck offshore Japan 189 km (117 mi) west northwest of Chichi-jima in the Ogasawara Islands on May 30 at a depth of 664.0 km (412.6 mi). The shaking of the earthquake was observed almost all over Japan, as it was one of the largest deep-focus earthquakes recorded worldwide. Magnitude 7.8 (mww), 664 km deep, Bonin Islands, Japan region — 27.84°N, 140.49°E. May 30, 2015 at 11:23 UTC. Tsunami: USGS flags this quake as having caused one, or the potential for one. Felt reports to USGS: 360. Wiki link https://earthquake.usgs.gov/earthquakes/eventpage/us20002ki3 Data: US Geological Survey (public domain).