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On Nov. 26, another earthquake jolted the small town in northwest Tarrant County. And on Friday, yet another one hit nearby. About 20 quakes rattled North Texas in November -- five of them in or near Azle.

The minor earthquakes haven't caused significant damage, but residents in Azle are getting nervous and seismologists are trying to get to the bottom of what's going on.

Some point to natural gas drilling that's happening in the Barnett Shale, a massive geological formation that covers about 20 North Texas counties. But a geophysicist with the National Earthquake Information Center says more testing is needed to make such a connection.

Azle isn't the kind of place with a Starbucks or a quaint coffee shop. But at the popular gas station, Centerpoint Kwik Stop, the morning coffee crowd could only talk about one thing:

"Bam. It was like something hit the side of my house -- and it wasn't nothing but the earthquake," Janice Hammond said.

She can still feel the tremors.

"Fifteen days now, we've had that little one every night, it seems like," she said.

"Real spooky"

Donna Luce is worried.

"I was sitting there watching TV, and my house just shook, and I've never felt that before, ever," she said. "Now, actually, I'm afraid of sinkholes."

Debbie Raub and her husband, Fred, described last Tuesday's quake with a 3.6 magnitude as "real spooky."

"Real loud boom, and then it just started shaking the ground under our mobile home," she said. "Just rocking it. And our dogs, they go totally insane. They know it before it happens."

Each time there's a quake, their two-bedroom trailer has to be re-leveled.

"You just have to get under there, and jack it up in spots, put a level on underneath the trailer, and level it," Debbie Raub said. "It's just pulling the ground out beneath our stands."

Fred Raub, who was born in Azle, says he doesn't think the quakes are natural. Several residents blame local natural gas drilling -- and the use of disposal wells to store wastewater from the drilling.

"They say it ain't what happens, but till then, we didn't have it," Fred Raub said. "You gotta drill about every mile. You just start looking around at all the drills they're putting down."

Timeline: Across North Texas, many earthquakes in November

Nov. 29 - near Azle, 3.2 magnitude

Nov. 28 - near Jacksboro, 2.8 magnitude

Nov. 28 - near Mineral Wells, 3.6 magnitude

Nov. 26 - near Springtown, 2.8 magnitude

Nov. 26 - near Azle, 3.0 magnitude

Nov. 25 - near Reno, 2.7 magnitude

Nov. 25 - near Azle, 3.3 magnitude

Nov. 23 - near Reno, 2.9 magnitude

Nov. 19 - near Azle, 3.6 magnitude

Nov. 19 - near Azle, 2.8 magnitude

Nov. 19 - near Reno, 2.5 magnitude

Nov. 13 - near Eagle Mountain, 2.6 magnitude

Nov. 11 - near Briar, 2.8 magnitude

Nov. 9 - near Springtown, 3.0 magnitude

Nov. 7 - near Springtown, 2.9 magnitude

Nov. 6 - near Springtown, 2.7 magnitude

Nov. 5 - near Newark, 2.3 magnitude

Nov. 5 - near Reno, 2.6 magnitude

Nov. 1 - near Richland Hills, 2.1 magnitude

Source: U.S. Geological Survey