Jack Brown was driving on a highway in Bangkok and thought he had punctured a tire when his vehicle swerved a little bit.
"I parked the car in stationary and realized that the car was still moving around quite a lot and I immediately knew then it was an earthquake," Brown told ABC News Live.
Concerned about being on the elevated highway during the earthquake, he continued along and saw a building under construction collapse "in a matter of seconds." He captured the collapse on video from his car.
"It was just horrifying to see that destruction, knowing that there are very likely a lot of people in the site," he said.
At least eight people were killed in the collapse, as a search and rescue effort is underway for more than 100 who remain missing, police said.
Brown said he had never experienced anything like this in his 10 years of living in Bangkok.
"When you're in an earthquake, you don't know if you're at the beginning of it, the middle or the end. Are there going to be any other aftershocks or any other earthquakes following this one? Are they going to get worse?" he said. "There was concern, but it was unprecedented for me, I didn't really know what to expect or what to do, and I just wanted to sort of keep moving and get away from that zone."
