Estimation of Earthquake Damage to Yokohama City


Work title                   :      Survey to Estimate Earthquake Damage to Yokohama City

Duration                     :      November 1, 2011 to November 30, 2012

Client                          :      Yokohama City Fire Bureau


Based on the experience of the 2011 Great East Japan Earthquake and new scientific knowledge, this survey estimated the distribution of the seismic intensity, damages to buildings, damages to people, damages to lifelines and other problems related to daily life in Yokohama city assuming a “northern Tokyo Bay earthquake” and “Nankai megathrust earthquake” in addition to a “full-power earthquake-type Kanto earthquake” which will expectedly cause the maximum damage to Yokohama City.

The survey utilized boring data for 20,000 sites in Yokohama City and earthquake records accumulated by the Yokohama municipal network of high density strong motion seismometers and evaluated seismic motion, liquefaction risk, etc. in detail using a mesh unit of 50 m.


Based on the estimated damages, EJEC later provided assistance for the “Yokohama Municipal Strategy for Earthquake Disaster Control” in a separate work ordered by the Yokohama City Policy Bureau. This Strategy identified disaster mitigation targets for Yokohama City and schematized various approaches to achieve these targets.