Thailand has 2 volcanos Doi Pha Khok Hin Fu, and Phanom Rung. Although, both are extinct and Phanom Rung actually has a temple built on top of it. (pictured below)


The closest active volcanoes to Thailand is the Barren Island Volcano and the Sinabung Volcano. The Barren is a stratovolcano has minor activity or eruption warning located in the Andaman Sea. It was last updated Feb 3, 2016 with weak thermal hot spot. The Sinabung is a stratovolcano and was last updated Feb 23 2016 as erupting (continuing pyroclastic flows). On February 2, 2014 "At least 16 people were killed when an Indonesian volcano (Sinabung) that had been rumbling for months unleashed a major eruption." These volcanoes can evoke deadly lava, gases, and ash when erupted.
(Barren Island Volcano)
(Sinabung Volcano)
Thailand is very developed compared to some of it’s neighboring countries and has established a warning system. “Thailand: the Thai Meteorological Department provides updated storm warnings, not just for the country, but for the rest of Southeast Asia as well. Thailand weather varies from north to south, so don't assume the weather is the same from one point of the country to the next.” This center is designed to regulate warnings to other countries about volcanic, seismic, and other activity present. Since there are no active volcanos in Thailand the people there don't necessarily have to worry.
Sources:
http://www.scmp.com/news/asia/article/1418876/least-16-dead-after-indonesian-volcano-mount-sinabung-erupts
Picture sources:
http://www.thaifoodandtravel.com/travel/itind.html
http://www.andamanmangroves.com/InBarren.php
http://www.scmp.com/news/asia/article/1418876/least-16-dead-after-indonesian-volcano-mount-sinabung-erupts
http://guardianlv.com/2013/11/mount-sinabung-volcano-erupts-again-thousands-flee-crops-destroyed/