Allen CV
Seismo Lab
Earth & Planetary
UC Berkeley

Earthquake Early Warning: JAPAN

Basics | ShakeAlert | Timeline | Japan | Mexico | Key Publications

E-larmS | G-larmS | T-larmS | MyShake

Highlights from a JMA survey of public perceptions of earthquake early warning completed in early 2012.
Full JMA report.

March 11, 2011: M9.0 Tohoku-Oki earthquake

Live TV broadcast during the M9 Tohoku-Oki earthquake of March 11, 2011. This live broadcast is from the Japanese parliamentary building in Tokyo where there is more than a minute of warning. While we see the warning on the TV, legislators do not receive the warning and therefore do not react until they start to feel shaking. The same warning that appears on this TV broadcast was also issued in the Tohoku region. In the coastal areas close to the epicenter there was 15 sec warning prior to the strong shaking.

Download mp4 (64Mb)

More information on the 2011 Tohoku-Oki warning and how it was used

2007: Public Earthquake Warning System for Japan

In 2007, Japan began operation of its nationwide public warning system that now makes use of 1100 seismic stations operated by the Japan Meteorological Agency (JMA) and the National Research Institute for Earth Science and Disaster Prevention (NIED). The JMA-operated system issues alerts via TV, radio, cell phones and a plethora of other specialty devices developed by the private sector.

For a summary of the history of the Japanese system see Kamigaichi et al. 2009

Map showing seismic stations used by the Japanese system. From Kamigaichi et al, 2009.


Support for the earthquake early warning efforts at UC Berkeley is provided by: