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Earthquake rattles area

Staff Reports

An earthquake rocked the area near Glenwood Springs Friday afternoon.OK, maybe it didn’t exactly rock the area, but the 2.5 magnitude earthquake did hit about 15 miles southeast of Glenwood Springs at 5:38 p.m., according to the U.S. Geological Survey, National Earthquake Information Center in Denver.William Gibson of Cattle Creek said this earthquake seemed stronger than past ones.”It shook the building quite a bit. It felt as if someone ran a car in the side of the building,” he said.Gibson said his house is sturdy, but he still felt it. He knew it was an earthquake from the start.Thomas Hill and his wife, Karen, of Missouri Heights, didn’t know whether it was an earthquake.”She thought it was. I was kind of skeptical. I didn’t know what it was,” Hill said.What he did know was that the earthquake was fairly strong.”It shook the house. It was very surprising,” he said. “Pretty amazing.”Magnitude is a measure of the strength of an earthquake or strain energy released by it, as determined by seismographic observations, according the USGS Web site.”This is a logarithmic value originally defined by Charles Richter. An increase of one unit of magnitude (for example, from 4.6 to 5.6) represents a 10-fold increase in wave amplitude on a seismogram or approximately a 30-fold increase in the energy released,” the Web site states. In other words, a magnitude 6.7 earthquake releases over 900 times (30 times 30) the energy of a 4.7 earthquake – or it takes about 900 magnitude 4.7 earthquakes to equal the energy released in a single 6.7 earthquake. The USGS says that except in special circumstances, earthquakes below magnitude 2.5 are not generally felt by humans. As of Friday night, the USGS Web site had about 11 reports of people noticing the earthquake.The USGS says that except in special circumstances, earthquakes below magnitude 2.5 are not generally felt by humans. As of Friday night, the USGS Web site had about 11 reports of people noticing the earthquake.


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