Japan Meteorological Agency seismic intensity scale information
Japanese earthquake measurements
Not to be confused with Japan Meteorological Agency magnitude scale.
The Japan Meteorological Agency (JMA) Seismic Intensity Scale[1] (known in Japan as the Shindo seismic scale)[2] is a seismic intensity scale used in Japan to categorize the intensity of local ground shaking caused by earthquakes.
The JMA intensity scale should not be confused or conflated with magnitude measurements like the moment magnitude (Mw) and the earlier Richter scales, which represent how much energy an earthquake releases. Much like the Mercalli scale, the JMA scheme quantifies how much ground-surface shaking takes place at measurement sites distributed throughout an affected area. Intensities are expressed as numerical values called shindo (震度, "seismic intensity"); the higher the value, the more intense the shaking. Values are derived from peak ground acceleration and duration of the shaking, which are themselves influenced by factors such as distance to and depth of the hypocenter (focus), local soil conditions, and nature of the geology in between, as well as the event's magnitude; every quake thus entails numerous intensities.
The data needed for calculating intensity are obtained from a network of 670 observation stations using "Model 95" strong ground motion accelerometers.[3][4] The agency provides the public with real-time reports through the media and Internet[5] giving event time, epicenter (location), magnitude, and depth followed by intensity readings at affected localities.
^This is the official name; see http://www.jma.go.jp/jma/en/Activities/earthquake.html and http://www.jma.go.jp/jma/en/Activities/inttable.html, both of which treat it as a proper noun.
^""A closer look at the shindo seismic scale" (in Japanese)". 2018-06-27. Retrieved 2020-03-25.
^""About The JMA's strong ground motion monitoring" (in Japanese)". Retrieved 2019-01-22.
^"List of current and past JMA seismic intensity observation points (in Japanese)". Retrieved 2019-01-22.
Seismicintensityscales categorize the intensity or severity of ground shaking (quaking) at a given location, such as resulting from an earthquake. They...
Meteorological Agency seismicintensityscale List of disasters in Japan by death toll List of volcanoes in Japan Nuclear power in Japan § Seismicity Kantō earthquakes...
seismologists around the world. In the 7-class JapanMeteorologicalAgencyseismicintensityscale, the highest intensity, Shindo 7, covers accelerations greater...
Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. These are distinguished from seismicintensityscales that...
The JapanMeteorologicalAgency magnitude scale (Japanese: 気象庁マグニチュード) is a seismic magnitude scale set by the JapanMeteorologicalAgency. In Japan, for...
The JapanMeteorologicalAgency said it recorded a maximum seismicintensity of 7 (Shindo 7), the highest level on its seismicintensityscale, the first...
the rock). The JapanMeteorologicalAgencyseismicintensityscale, the Medvedev–Sponheuer–Karnik scale, and the Mercalli intensityscale are based on the...
on the island of Kyushu to register as a 7 on the JapanMeteorologicalAgencyseismicintensityscale. On April 15, the JMA officially labelled it Heisei...
kilometers (21.7 mi). The JapanMeteorologicalAgency (JMA) registered a magnitude of 6.7 Mj and a maximum intensity of 7 on the shindo scale. Shaking from the...
recorded as 6.7 MJMA and at its peak intensity at Shindo 6 Lower on the JapanMeteorologicalAgencyseismicintensityscale. The earthquake did not result in...
and on the island of Yonaguni, Japan, where it measured Shindo 4 on the JapanMeteorologicalAgencyseismicintensityscale. The earthquake had a focal mechanism...
earthquake in Japan was officially measured at a seismicintensity (shindo in Japanese) of the highest Level 7 on the scale of JapanMeteorologicalAgency (JMA)...
Tsunamis. Reporting Centers; Tsunami alert page (in English) from JapanMeteorologicalAgency NOAA Centre – National Oceanic and Atmospheric Administration...
(134 mph (216 km/h)) and earthquakes up to 7 on the JapanMeteorologicalAgencyseismicintensityscale. The observation floor gives a 360-degree view of...
In seismology, an earthquake swarm is a sequence of seismic events occurring in a local area within a relatively short period. The time span used to define...