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Tuesday, August 23, 2011

Largest Quake in 40 Years Colorado

5.3 magnitude earthquake shakes southern Colorado- the largest quake in 40 years

Tuesday, August 23, 2011, 4:20 PM

Here is the best report I can find on the earthquakes that have been hitting us yesterday and today. I appreciate all your prayers!         
Tom Mack

5.3 magnitude earthquake shakes southern Colorado- the largest quake in 40 years

August 23, 2011 COLORADO – Southern Colorado was rattled by a magnitude 4.6 earthquake Monday evening near Trinidad. That quake was overshadowed by a much stronger 5.3 magnitude earthquake which struck near the same region. A string of aftershocks followed. The same area had been struck by a gentler temblor earlier in the morning. According to the US Geological Survey, the 4.6 quake occurred at 5:30pm and was centered 16 miles west southwest of Trinidad or 20 miles west northwest of Raton, New Mexico.

The quake occurred at a relatively shallow depth of 5.0 miles. Initial reports show the quake was felt in Trinidad and as far north as La Veta and Aguilar. To the south in New Mexico, Raton felt the shaking as well as Springer and Questa. This morning, a magnitude 2.9 quake struck the same area at 7:52am.  This also follows a magnitude 2.8 temblor in March. Other quakes up to magnitude 4.1 have been recorded in January 2010 as well as a series of quakes in the area in August 2009. The earthquake's epicenter was 299 km (185 miles) S of DENVER, Colorado. –The Examiner  –

Seismicity activity in the Sangre de Cristos Mountains: The Sangre de Cristos are fault block mountains with major fault lines running along both the east and west sides of the mountains. In places, there are also fault lines cutting right through the mountain chain. The mountains were pushed up about 27 million years ago, pretty much as one big chunk of rock. On the west side is the San Luis Valley with the Rio Grande Rift Zone running down the middle. On the southeast side is the Raton Basin with a quiet but still active volcano field. On the northeast side are the Wet Mountains and the Front Range, areas of pre-Cambrian rock raised up during the Colorado Orogeny some 1.7 billion years ago.

The Blanca Massif is also pre-Cambrian rock while the main body of the Sangres themselves is composed of Permian-Pennsylvanian rock and a mix of igneous intrusions, conglomerates and shale that is only about 250 million years old. 
-SangresActivity along the many faults running in and through the Sangre de Cristos mountains could be one likely cause of the mysterious Taos Hum. This latest episode of quake activity near Trinidad may have been building for some time. See map    -The Extinction Protocol
 Colorado experiences largest quake in more than 40 years:  A moderate 5.3-magnitude earthquake that rattled southern Colorado early Tuesday morning was the largest to hit the state in more than 40 years, the U.S. Geological Survey said. The quake's epicenter was seven miles southwest of Cokedale, and 180 miles south of Denver. There were no immediate reports of casualties. A dispatcher at the sheriff's office in Las Animas County, which includes Cokedale, said the quake lasted almost 30 seconds.

The office received reports of rocks falling on a highway and of some structure damage. It was the largest in a series of earthquakes that struck the area. As of 5 a.m. local time (7 a.m. ET), the USGS reported seven quakes centered just south of Cokedale since midnight. Amy Vaughan of the USGS said the 5.3 magnitude ties that of an earthquake Colorado suffered on August 9, 1967. In 1973, the USGS originally reported a quake with a magnitude of 5.7, but it turned out that was caused by an explosion, Vaughan said. -CNN

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