Cleburne - A fourth earthquake prompted city officials to hire a geologist and then another earthquake happened about an hour before the emergency meeting.

The fifth earthquake took place Tuesday at 6:19 p.m. and the U.S. Geological Survey measured it at a 2.1-magnitude. Cleburne officials called for an 8 p.m. emergency meeting Tuesday after the fourth earthquake, measuring a 2.6, happened that same day at 5:10 p.m.

No damage or injuries have been reported from the tremors.

"I've been here all my life, since 1950. Everybody's worried about it. That's all the talk all over town - earthquakes. You know everybody blames the oil companies, gas companies," said Cleburne resident James Barton. The city's leaders are not ruling gas drilling as a cause.

"We want just straight, factual information. We don't want to throw anyone under the bus," said Cleburne Mayor Ted Reynolds. "We don't want to leave any stones unturned either."

But right now, solid information is hard to come by. Even the quakes' epicenters are hard to nail down. Since Cleburne takes in natural gas revenues, it wants independent researchers. It asked SMU to lead the way.

"We're trying to understand what the structure is, what the geology looks like, what the crust looks like and so these instruments provide us the ability to characterize the earth in which we live," said Brian Stump, a professor of earth sciences.

The other earthquakes within the last week had magnitudes of 2.3, 2.6 and 2.8.