The government is mobilising aid and rescue teams to send to Nepal, while authorities have confirmed that six Thai medical students, who earlier lost contact, are safe along with 60 other Thai citizens.
Deputy government spokesman Sansern Kaewkamnerd said Sunday Prime Minister Prayut Chan-o-cha instructed the Public Health Ministry and the Royal Thai Armed Forces to prepare medical and disaster relief teams to be sent to earthquake victims in Nepal as soon as possible.
The PM also asked the Thai embassy in Nepal to contact any Thai citizens either in Nepal or its neighbouring countries, which may also have been affected by the quake, said Maj Gen Sansern.
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Any Thai affected by the earthquake who wants to return to Thailand will get help to travel back home under the Foreign Ministry's protocols, Gen Prayut said.
Aside from immediate assistance, the government will organise a nationwide fund-raising effort to collect donations for quake victims, said Maj Gen Sansern.
If anybody wishes to inquire about relatives in Nepal, a coordination centre has been set up at the Thai embassy in Kathmandu, he said.
People are encouraged to call the Foreign Ministry's hotlines on 094 003 7190, 094 003 7191, 094 003 7192 and 085 911 4076.
They may call the Thai embassy in Kathmandu directly at +977 14414372 or +977 9801069233 or fax +977 14371410.
Foreign Minister Tanasak Patimapragorn said the government will send the medical and disaster relief teams to Nepal within the next few days.
"We will approve initial funds as a part of humanitarian assistance to Nepal. At present, we are working with the agencies concerned to find out what they need and how we can help," Gen Tanasak said.
Sek Wannamethee, the Foreign Ministry spokesman, said all Thai nationals in Nepal were confirmed as safe, with only some suffering minor injuries from the quake.
Wutti Wuttisant, the Thai ambassador to Nepal, said there are about 100 Thais living in Nepal.
At least 20 Thai nationals, mostly civil servants and their families, moved into a shelter at the Thai embassy in Kathmandu and prefer to stay in Nepal for the time being, according to Mr Sek.
The ministry confirmed Sunday the six medical students from Srinakharinwirot University who initially fell out of contact after the quake are now confirmed as safe.
The group was visiting Pokhara, about 140km from Kathmandu.
But Marisa Eve Girawong, a half Thai-American medical doctor working for a mountaineer team, was reportedly killed in an avalanche at a base camp on Mount Everest, according to media reports.
The 28-year-old Thai-American doctor, died after the 7.9 magnitude earthquake that killed thousands, including more than a dozen on the world's highest mountain.
Quake victim Marisa Eve Girawong, a 28-year-old Thai-American doctor, died at an Everest base camp in an avalanche triggered by the 7.9 earthquake.
Hours before the avalanche, Marisa wrote on Facebook that she was craving sushi. She was most recently a resident of Edison, New Jersey. Seattle-based Madison Mountaineering confirmed Girawong's death on its website.
"It is with deep sorrow and profound grief that we can confirm the loss of our Everest/Lhotse base camp doctor," Madison co-founder Kurt Hunter wrote in a blog post entitled "Our hearts are broken."
Girawong died at the expedition's 17,500-foot elevation base camp. All 15 members of the expedition's climbing team made it safely to Camp 2, where they were awaiting helicopter evacuation.
According her bio on the mountaineering company's site, Girawong, who was born in Thailand, had been a physician's assistant working in a Level 1 emergency room "with a focus on trauma and wilderness medicine" when she joined the Everest expedition earlier this year.
Girawong, an avid rock climber and mountaineer, had been working in the Everest region for more about a year.
"Officially the highest I've been so far at 5,550 meters/18,300 ft.," she wrote on Facebook on April 12. "Never made it last year but finally got to the top of Kala Patthar."
Hours before the avalanche struck, Girawong wrote on Facebook:
"Day 28 on this arduous journey, snow is falling & my food cravings are at an all time high. Is a crunchy spicy tuna roll with eel sauce too much to ask for?"
The UN Children's Fund in Thailand (Unicef) launched an appeal for urgent donations from the Thai public to help with the response.
"It was a terrifyingly strong earthquake. [There was] extensive damage to buildings across the city and many people have spent the night outside in the cold because of the ongoing shocks," said Bijaya Rajbhandari, Unicef's country representative.
"These people are without basic facilities and the government hospitals are already overcrowded. People need help and they need it now."
Unicef is providing supplies, such as water purification tablets, hygiene kits, tarpaulins and food, and is working with government and other agencies to meet children's immediate needs. To make a donation, click on "Donate for Nepal" at www.unicef.or.th.