Japan's government has received offers for assistance from 91 countries, and has accepted assistance from about 15 based on assessed needs, mostly for specialised international urban search and rescue (USAR) teams and medical teams.
Following is a list of aid offers:
Afghanistan: The southern Afghan city of Kandahar announced it was donating $50,000.
Australia: Sent a 72-strong urban search and rescue team, including sniffer dogs, to Miyagi prefecture. A wide-body C-17 military transport is also providing airlift support, helping move fresh water, Japanese troops and equipment to the quake-zone. The government has also offered field hospitals and victim identification specialists.
Britain: Sent fire brigade search and rescue specialists and equipment including heavy lifting and cutting equipment consisting of 64 personnel and two dogs, and said it would send nuclear physicists if requested.
China: A 15-member rescue team arrived in Japan on Sunday, state news agency Xinhua said, bringing with them four tonnes of equipment for search and rescue operations, including their own power supply and telecommunications.
* The government has donated 30 million yuan ($4.56 million) of relief supplies to Japan, the first batch of which has already left Shanghai, including quilts and tents.
*Premier Wen Jiabao said on Monday Beijing stood willing to offer further help.
France: France has sent a search and rescue team consisting of 134 personnel.
Germany: Germany has sent a search and rescue team consisting of 41 personnel and three dogs.
Hungary: Hungary's emergency authority said it had offered a 16-member crew as part of the International Response Assistance Network (RANET) programme to check radiation and do medical advisory work in seven monitoring teams.
India: The government is getting ready to ship planeloads of woollen blankets.
Lithuania: Lithuania's state fire and rescue service said it was ready to offer up to 32 rescuers, including three with search dogs and three paramedics. Lithuania coordinates assistance via the European Union.
Mongolia: Has donated $1 million and 2,500 woollen blankets, and has offered to send up to 300 soldiers to help with relief efforts, the country's Montsame news agency said.
New Zealand: New Zealand has sent a search and rescue help team consisting of 65 personnel.
Russia: Russia's state nuclear corporation, Rosatom, said it had offered to help in responding to the problems at Japanese nuclear plants if necessary. Russia sent 75 rescuers on Sunday to work in quake-affected areas, the Emergencies Ministry said.
Slovakia: Prime Minister Iveta Radicova told parliament that Slovakia had 250,000 euros ready for Japan, but will coordinate with other EU states. Radicova said Japan had asked not to send rescue workers until they have a general idea how to proceed. Slovaks have 25 rescue workers ready.
South Korea: A 102-member South Korean rescue team departed for Fukushima, where the stricken nuclear plant is located, on Monday aboard three air force C-130 planes. A further 100 rescue workers are on standby to go to Japan. An advance team of five rescue workers and two search dogs have been in Japan since Saturday.
Sri Lanka: Announced $1 million aid and a military relief team with medical assistance to be dispatched to Japan.
Taiwan: A 28-member team of rescue specialists left for Tokyo on Monday. The team contains some specialists who worked in Christchurch, New Zealand, which was hit by a quake in February. It has sent its first batch of supplies, including clothing, blankets and food, and will start shipping heaters.
Thailand: The cabinet has allocated 200 million baht ($6.58 million) to buy warm clothes, gloves, rubber boots, instant food and other goods to be sent to Japan in the next day or two. It will also send 15,000 tonnes of rice.
* A first medical team leaves on Monday night, including two doctors and a nurse. They will primarily be taking care of about 500 to 600 Thai people in quake-hit Sendai, northeastern Japan. Thailand has another 17-staff medical team ready to go.
United States: The nuclear-powered aircraft carrier USS Ronald Reagan has arrived in Japan to assist relief efforts. More US warships arrived off the coast on Sunday.
* The US embassy in Tokyo has provided an initial $100,000 in immediate disaster relief assistance, and Washington is ready to provide any additional help requested.
* The US Agency for International Development (USAID) has deployed two urban search and rescue teams, comprising some 150 people and around 12 dogs trained to detect survivors.
Vietnam: Will provide $200,000 in quake/tsunami aid. the Vietnamese Red Cross will give an initial $50,000 via the Japanese Red Cross, state-run news website VnExpress.vn said.
* Technical assistance teams have been deployed from the Turkish Red Crescent, Switzerland Humanitarian Aid Response Team, Canadian Medical Assistance Team, Save the Children and Plan International. Initial observations from the MSF assessment teams that deployed to Miyagi prefecture indicate the need for food, blankets and water in Sendai City. Telecoms sans Frontiers (TSF) is providing emergency telecommunications assistance from Tokyo.
* Medecins Sans Frontieres (MSF) currently has a team of 10 people divided into three teams conducting mobile clinics and assessments in Miyagi prefecture.
* The U.N's Office for the Coordination of Humanitarian Affairs (OCHA) says on its website that an emergency rescue and relief operation under way in northeast Japan continues to be hampered by high magnitude aftershocks. ($1=30.38 Baht)