2011 Sendai Earthquake And Tsunami, Tōhoku Region, Pacific Ocean

Japan specifically requested teams from Australia, New Zealand, South Korea, the United Kingdom, and the United States; it also requested (via its space agency JAXA) the activation of the International Charter on Space and Major Disasters, allowing diverse satellite imagery of affected regions to be readily shared with rescue and aid organizations.
New Zealand sent an urban search and rescue team which had spent the previous three weeks searching buildings following the 2011 Christchurch earthquake, and 15 tonnes of rescue equipment.
Australia sent the frigate HMAS Sydney and heavy landing ship HMAS Tobruk carrying helicopters, Australian Army engineers and medical teams.
The United States moved naval vessels closer to Japan for the purposes of providing aid, including the aircraft carrier Ronald Reagan. Germany is sending search and rescue specialists from the Technisches Hilfswerk. The United Kingdom is sending 70 rescuers to Japan, including two search dogs, a medical support team and 11 tons of specialized rescue equipment. South Korean aid arrived in Japan on March 12, consisting of 5 members from the National Rescue Services and two rescue dogs, and a subsequent team of 102 rescue workers.