Impacts from the March 11, 2011 M8.9 Miyagi, Japan Earthquake

Download EQECAT's Preliminary Discussion on Impacts from the March 11, 2011 M8.9 Japan Earthquake and Tsunami (PDF 681 KB). The post-event report is EQECAT's preliminary recap of the Japan disaster and its impact addresses the earthquake, ground motions, tsunami, nuclear power, fires, ground shaking damage, modeling of the earthquake, and economic loss estimates.


A massive, magnitude 8.9 earthquake struck the Japan Trench megathrust fault off the eastern coast of Honshu on Friday, March 11, 2011. Over 12 million people (10% of the total population of Japan) were significantly affected by this event.

Ground Motions

This earthquake affected a broad swath of Japan. The USGS has produced a peak ground acceleration ground motion map displaying their modeled estimate of the distribution of ground motions, as shown in the PDF version of the report.

The catastrophe report is a printable summary of the Japan earthquake / tsunami CatWatch report of March 12, 2011.

Back to Post-Event Catastrophe Reports


Related Materials

Download the Japan Quake Model Fact Sheet

Japan Earthquake Model Fact Sheet
(PDF 447 KB)

Global Earthquake Clustering

View EQECAT's Post Event Report - Global Earthquake Clustering

Apparent global clustering of damaging earthquakes is raising concern that our planet might experience even more catastrophic tremblors in the near future. EQECAT experts have been studying these events and have published their insights and perspectives.

Read EQECAT's expert insights into global earthquake clustering.

Japan Earthquake Digest

View EQECAT's Post Event Reports - Japan Earthquake Digest

View EQECAT's digest related to earthquakes in Japan during March 2011, including post-event reports, insights, and related CatWatch Reports, and news coverage regarding the Japan earthquake and tsunami of March 22, 2011.