print PRINT

SECURITY > Okinawa

Expert team says Henoko embankment might collapse

  • February 17, 2020
  • , Mainichi , p. 2
  • JMH Translation

A team of independent experts assessed the stability of the embankment planned for the site of the U.S. base construction in Henoko according to data indicating that the seabed ground was soft at depths greater than 70 meters below sea level. On Feb. 16, the team reportedly got results that the embankment might collapse in the worse case.


The team of about 10 members is headed by Niigata University emeritus professor of geology Masaaki Tateishi. The data indicate that the ground may be soft at B27, the point around which the Japanese government plans to build the C1 embankment. According to Professor Tateishi, calculations using this data showed that the area does not meet the Ministry of Land, Infrastructure, Transport and Tourism’s criteria for port and harbor installations, and the embankment may collapse under its weight.


The defense ministry plans to apply for a change in construction plan with Okinawa Prefecture in March 2020. The ministry explained that a commercial contractor collected the seabed data on its own initiative, and that the method used was simple and not reliable.


Professor Tateishi said the Defense Ministry should re-survey at B27 and announce the results.

  • Ambassador
  • Ukraine
  • COVID-19
  • Trending Japan