By the time Lewis and Clark arrived on the West Coast in 1805, it had been 105 years since the Cascadia Subduction Zone last ruptured, sending a large portion of the Pacific Ocean roaring toward the coast. At the time the Quaternary Fault and Fold database was established (1993), the Quaternary time period was defined as <1.6 Myr in the In order to maintain a current and relevant dataset, effective January 12, 2017, the USGS will maintain a limited number of metadata fields that characterize the Quaternary faults and folds of the United States. A map which shows these fault lines can tell you whether you reside in an area prone to earthquakes or not.One should have a sound knowledge of various aspects of geology to recognize fault lines on the surface of the planet. The city of LA is prepping for an earthquake on these 5 fault lines. For example, if you want to see the youngest and most active prehistoric faults, one would search for faults that have moved in the past 15,000 years at rates>5 mm/yr.Complete as few or many of the fields as you wish. Click on the fault line for a description.
The computations for these maps and data used 50 year return periods on firm rock at 760 m/sec. This map is a progress report. Although seismicity maps and earthquake catalogs show the past 100 to 150 years of felt and instrumental earthquakes, many faults in the United States have return times of thousands to tens of thousands of years for surface faulting events. Quaternary Fault and Fold Database of the United StatesInteractive Quaternary faults map.
Zoom out to see the locations and sizes of other recent earthquakes around the world. Preliminary map showing known and suspected active faults in Idaho; 1975; OFR; 75-278; Compiled by Witkind, Irving Jerome
Our definition of published literature includes typical sources (journals and maps), as well as M.S. Quaternary Fault and Fold Database for the Nation; 2004; FS; 2004-3033; Geological Survey (U.S.) You should turn off this feature prior to conducting searches that require entering characters or digits.The database structure was created by Kathy Haller (USGS) and an early version of the web interface and search engines were created by Larry Mayer (formerly of the University of Miami at Oxford, Ohio). Earthquake Fault Maps (PDFs) Utah earthquakes (1850–2016) and Quaternary faults Map #277. Many tribes even left the region permanently.However, it wasn’t until the discovery of the Cascadia Fault in the 1960s that modern settlers truly understood the dangers they faced.Running 680 miles along the Pacific Northwest coastline, the Cascadia Fault directly threatens 3 major metropolitan areas: Portland, Seattle, and Vancouver.With Cascadia capable of producing a magnitude 9.0 earthquake, the Pacific Northwest may soon face shaking 16 times more powerful than San Francisco’s devastating 1906 earthquake, lasting 4 minutes and delivering a mighty tsunami of unimaginable proportions.It’s not just the West Coast that needs to watch out for tectonic obliteration.Between 1811 and 1812, this zone experienced some of the largest quakes in history.And although they originated in the Mississippi Valley, they rang church bells in Boston and shook New York City — over 1,000 miles away!Even then-President James Madison and his wife Dolley reportedly felt shaking at the White House.After one particularly large rupture in the fault, the mighty Mississippi River was forced to run backward for several hours, devastating acres of forest and creating 2 temporary waterfalls.Fortunately the Mississippi Valley was sparsely populated back then.
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