The Great East Japan Earthquake broke off the coast of northern Japan at 14:46 JST on Friday, 11 March 2011 with 9.0-magnitude and the epicenter of 129 km east of Sendai. The coasts of Iwate, Miyagi, and Fukushima Prefectures were severely damaged and Hokkaido, Aomori, Ibaragi, Chiba Prefectures were also damaged due to especially tsunami generated by the earthquake.
　Port and Airport Research Institute (PARI) is conducting investigations for the early recovery of ports and coasts from the disaster with the Ministry of Land, Infrastructure, Transport and Tourism. Survey teams from PARI and NILIM (National Institute of Land and Infrastructure Management) conducted disaster surveys on the Earthquake and Tsunami from March 14 to April 14.
　This is a report of the urgent surveys including tentative analyses of records of strong motion seismometers and tsunami records of GPS wave meters and tide gauges in addition to the tsunami generation and propagation simulations.
　Major conclusions of the report are as follows:
　1) Huge tsunami due to M9.0, like the Indian Ocean Tsunami was generated off the northern Japan coasts. Especially more than 6m tsunami was measured by GPS wave meters 20 km off the coasts at the depth of 200m which was expected to be twice or thrice in shore. The data contributed significantly to issuing a Large Tsunami Alert through the Japan Meteorological Agency.
　2) More than 10m tsunamis attacked the coasts of Iwate, Miyagi and Fukushima Prefectures, resulting devastating disasters in the coastal cities with more than 27 thousands of casualties and missing. All the kinds of tsunami damages were observed with their most severe figures including crashing and drifting of wooden houses, drifting of cars, leakage of oil from tanks, fires.
　3) In ports, ships were sunk or drifted on lands. Facilities of warehouses and factories were inundated and broken. The breakwaters and seawall which were designed against severe storm waves from the ocean were relatively safe and reduced the tsunami even though the tsunami was so strong.
　4) In the ports south from Sendai earthquake damages appeared. The early use of the ports in the area for the recovery operations became possible due to relatively low damage to port facilities.
　5) More investigation should be continued for the early recovery of the ports including the surrounding towns. Especially the disaster mitigation planning and the designing methods of facilities against tsunamis should be reconsidered to include the worst case like this tsunami.