Japan Earthquakes

About

This site shows the latest earthquakes in Japan: magnitude, focal depth, the epicentre on a map and the maximum seismic intensity per prefecture. The data are reports of the Japan Meteorological Agency (JMA) relayed by P2P地震情報; if it is unavailable, backup sources (JMA directly and USGS) are used.

Magnitude and intensity are different things. Magnitude describes the energy of an earthquake and is one number for the whole event. Intensity (JMA scale, shindo, 震度) shows how strongly the shaking was felt at a particular place, so it differs between prefectures.

JMA intensity scale

• 1barely felt
• 2felt by many indoors
• 3noticeable, hanging objects sway
• 4furniture moves, small items may fall
• 5−5+hard to walk, damage possible
• 6−6+hard to stand, weak buildings may collapse
• 7highest level, severe destruction

Sources

P2P地震情報 (relaying JMA reports), the Japan Meteorological Agency (jma.go.jp), USGS. Basemap — Esri.

This site is informational and does not replace official warnings: in case of danger follow JMA and local authorities.