NEW YORK (TheStreet) -- While the "Flash Crash" of 2010 is unlikely to happen again, the stock market is still vulnerable to sudden and unexplained selloffs, finance experts say.

"A lot of what has happened since the Flash Crash is what I would call proactive regulation," said Maureen O'Hara, professor of finance at the Johnson Graduate School of Management at Cornell University.

It was five years ago Wednesday that the Dow Jones Industrial Average plummeted almost 1,000 points in minutes, causing a world-wide panic among investors. Though the market quickly recovered, the causes of the crash are still being debated.

More from Markets

Week Ahead: Trade Fears and Stress Tests Signal More Volatility To Come

Week Ahead: Trade Fears and Stress Tests Signal More Volatility To Come

Trump Takes Aim at Auto Imports; Markets End Mixed -- ICYMI

Trump Takes Aim at Auto Imports; Markets End Mixed -- ICYMI

Video: What Oprah's Content Partnership With Apple Means for the Rest of Tech

Video: What Oprah's Content Partnership With Apple Means for the Rest of Tech

REPLAY: Jim Cramer on the Markets, Oil, Starbucks, Tesla, Okta and Red Hat

REPLAY: Jim Cramer on the Markets, Oil, Starbucks, Tesla, Okta and Red Hat

Flashback Friday: The Market Movers

Flashback Friday: The Market Movers