Fill out and submit this form so that we can send you information updates. (photo 1960) The Rocky Mountain Arsenal was a United States chemical weapons manufacturing center located in the Denver Metropolitan Area in Commerce City, Colorado.The site was operated by the United States Army throughout the later 20th century and was controversial among local residents until its closure in 1992. Each HAZUS historical-earthquake-based ZIP file includes a number of PDF files of individual reports that may or may not include: The PDF files may be navigated using the built-in bookmarks feature that may be seen to the left of an Adobe Acrobat (Reader) window. First, the largest earthquake we saw associated with it was a magnitude 4.9, and there was some damage associated with it. The first page of the PDF appears below. 105 0 obj <> endobj The injection of chemicals began in March 1962 and by the end of the year 190 earthquakes had occurred. Colorado has a long history of induced earthquakes, going back to the first study in the 1960s at the Rocky Mountain Arsenal. 0000006176 00000 n The largest and most widely known resulted from fluid injection at the Rocky Mountain Arsenal near Denver, Colorado. Back in the 1960s a 12,000 foot injection well was drilled at the Rocky Mountain Arsenal. However, the earthquakes did not stop, continuing at a rate of “from 4 to 71 per month”. In 1962, crews at the Rocky Mountain Arsenal, a now-defunct chemical weapons plant just north of Denver, began injecting liquid waste down a well that penetrated more than two miles of earth. Map showing locations of earthquakes near the Rocky Mountain Arsenal, Colo., diagrams showing surface-wave focal mechanisms of the three largest Denver earthquakes, and chart showing numbers of earthquakes per month correlated with average monthly injection pressure 40 A2. <]>> Denver earthquakes. Most in­ vestigators agree that the earthquakes have been trig­ gered by the injected fluid and a recommendation has from the Rocky Mountain Arsenal. 1801 Moly Road The August 2011 M 5.3 event is the second-largest earthquake to date for which there is clear evidence that the earthquake sequence was induced by fluid injection. On a smaller scale the US army's Rocky Mountain arsenal near Denver Colorado was considered to be in a geologically stable region until the early 1960s. Den-897 Colorado is considered a region of minor seismicity. 0000002518 00000 n 0000001741 00000 n Rocky Mountain Arsenal, USA in 1960s were 123 172 Geomech. Monetary values are in either 2006 or 2013 dollars, depending on the date of the simulation (which appears on the report cover sheet). An analysis, based on the assumption that fluid flow in the fractured reservoir can be approximated by flow in a porous medium, is presented. fema, Within months, Denver residents were jolted by a series of earthquakes, including one of magnitude 4.8 that caused more than $1 million in damage. Environmental Geology, Alert - Holiday Hours and Closures Follow Us Online In 1967, an earthquake of magnitude 5.5 followed a series of smaller earthquakes. The first inklings of the connection came in the early 1960s from Colorado’s Rocky Mountain Arsenal (RMA). This first happened at the Rocky Mountain Arsenal, a nuclear weapons facility outside of Denver. Rocky Mountain Arsenal National Wildlife Refuge was established, in part, to protect our national symbol, the bald eagle. Earthquakes reported in this study were of magnitude z 1.0; most were greater than magnitude 2.0, with the exception of the Denver events. 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