Big One hit Colorado over 140 years ago

More than 140 years ago, a 6.6-magnitude earthquake hit Colorado.

Golden, Colorado – The most powerful earthquake that ever hit Colorado occurred on November 7, 1882. Geologists today refer to the Great Colorado earthquake.

Headline in Rocky Mountain News – Terra Totters, earthquake shock felt felt in town.

“The power got knocked down here in Denver. The generators were immediately taken off their seats,” said Matt Morgan, director of the Colorado Geological Survey (CGS). “In Grand Junction, people were running out of their homes thinking they had been demolished.”

He said they did not have the equipment at the time to measure the earthquake’s intensity, but scientists at CGS were able to estimate a magnitude of 6.6 using eyewitness reports of vibration and damage from newspapers.

>> Click the links to read other news reports from 1882

The Pueblo Chieftan – Headline: “Mother Earth. Her calm chest sways and moves with competing emotions.

Aspen Times – Earthquake. Shock gives Aspen a call and turns the tables. Clocks and bird cages upside down.

CGS also did a field study to try to find the epicenter, but the evidence was too swayed to get a definitive answer. They can say however that it was about 30 miles north of Estes Park and the shaking was strong enough to be felt in 5 states.

An earthquake intensity map created by CGS shows that a shaking of magnitude 6 or greater could have been felt in a large area including Estes Park, Laramie, Steamboat Springs, and even Golden.

Denver could have felt 5 degrees strong.

“Using building and infrastructure inventory, in 2013 it would have cost about $23 billion to replace the structures that were damaged. At present, we’d probably pay $30 billion if not more,” Morgan said.

At the Colorado Geological Survey, they monitor Colorado earthquakes and study their fault lines. Only this year, Morgan said, there were 50 earthquakes in the state.

Although they were all a size 3 or less, he said they were barely noticeable to most people.

He said the 1882 earthquake nonetheless shows the potential for a major earthquake in Colorado. CGS has identified faults capable of producing earthquakes close to magnitude 7.

Named the Sangre de Cristo Fault that runs along the eastern side of the San Luis Valley, the Chirao Fault in the Eastern Plains near La Junta likely has this potential magnitude 7.

If one of that magnitude got to the right place, Morgan said it could destroy cities like Denver and Colorado Springs.

“But the flaws that really scare me are the ones we don’t know about yet,” Morgan said. “There are a large number of faults still to be discovered in Colorado, and some others still need further study.”

One of the best ways for geologists to study the potential for seismic faults, he said, is a process called trenching. This requires human scientists and costs between $15,000 and $20,000.

CGS can only occasionally tolerate a new bug.

“For example, the Ute Pass and Rampart Range fault that runs along Colorado Springs – not much is known about these two faults,” he said. “But it is located under a huge population center.”

Although large earthquakes are very uncommon in Colorado. The second strongest measurement ever took place in 1960, measuring 5.5 degrees between Montrose and Ridgway.

“We are not trying to intimidate anyone, we just say we are trying to understand it. So we know what the past was like and we can put that into the future.”

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