throughout the United States. Fault creep is the name for the slow, constant slippage that can occur on some active faults without there being an earthquake. noun Geology. The descriptions contain information on geographic, geologic, and paleoseismic parameters that are deemed critical to making geologic-based assessments of seismic hazards. faulting, fracture, break, fault, shift. fault zone. Faults may also displace slowly, by aseismic creep. A transform fault may occur in the portion of a fracture zone that exists between different offset spreading centres or that connects spreading centres to deep-sea trenches in subduction zones. This map is a progress report. The search capabilities described below will allow the user to sort the data on a variety of fields (geographic, structural, time of movement, slip rate, etc.). The most recent effort began in 1990 in support of the International Lithosphere Program (ILP), which formed Working Group II-2. Because of its scale, it cannot be used as an index of specific faults or fault hazards. Large faults within the Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as subduction zones or transform faults. Geologic evidence demonstrates the existence of a fault or suggests Quaternary deformation, but either (1) the fault might not extend deeply enough to be a potential source of significant earthquakes, or (2) the currently available geologic evidence is too strong to confidently assign the feature to Class C but not strong enough to assign it to Class A. Geologic evidence is insufficient to demonstrate (1) the existence of tectonic fault, or (2) Quaternary slip or deformation associated with the feature. The Advanced Search form can be used to further limit the search results. This numeric identifier allows us to clearly cite multiple-same year publications for authors. A fault is a fracture in rock where there has been movement and displacement. anastomosing (i.e. 1. geological fault - (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; "they built it right over a geological fault"; "he studied the faulting of the earth's crust". We generally do not cite unpublished field mapping, field notes, and other gray-literature reports that are not generally available to the public. Faulting occurs when shear stress on a rock overcomes the forces which hold it … In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. The computations for these maps and data used 50 year return periods on firm rock at 760 m/sec. The dip of a fault plane is its angle of inclination measured from the horizontal. Strike and dip refer to the orientation or attitude of a geologic feature. theses and Ph.D. dissertations, governmental contract reports (which includes many NEHRP-sponsored studies), abstracts, and open-file (preliminary) reports. You should turn off this feature prior to conducting searches that require entering characters or digits. This movement may vary from a few centimetres to many kilometres depending on the nature and magnitude of the stresses and resistance offered by the rocks. Transform fault, in geology and oceanography, a type of fault in which two tectonic plates slide past one another. Definition of a Fault: Faults are fractures along which movement of one block with respect to others has taken place. Plates can slowly and continuously move against each other or can build up stress and suddenly jerk. When you use this data, please provide proper acknowledgment. Synonym Discussion of fault. Continuous reflections stand out as an overlapping array of peaks or troughs. Any fault -bounded s liver in a fault zone is a . This sometimes makes earthquakes . Data for Quaternary faults, liquefaction features, and possible tectonic features in the Central and Eastern United States, east of the Rocky Mountain Front; 2000; OFR; 2000-260; Crone, Anthony J.; Wheeler, Russell L. Probabilistic seismic hazard assessment for the state of California; 1996; OFR; 96-706; Petersen, M. D.; Bryant, W. A.; Cramer, C. H.; Cao, Tiaquing; Reichle, M. S.; Frankel, A. D.; Lienkaemper, J. J.; McCrory, P. A.; Schwartz, D. P. National Seismic-Hazard Maps: Documentation June 1996; 1996; OFR; 96-532; Frankel, Arthur D.; Mueller, Charlies S.; Barnhard, Theodore P.; Perkins, David M.; Leyendecker, E. V.; Dickman, Nancy; Hanson, Stanley L.; Hopper, Margaret G. Maps of major active faults, Western Hemisphere, International Lithosphere Program (ILP), Project II-2; guidelines for U.S. database and map, June 1993; 1993; OFR; 93-338; Haller, K. M.; Machette, M. N.; Dart, R. L. Quaternary fault map of the Basin and Range and Rio Grande Rift provinces, Western United States; 1982; OFR; 82-579; Nakata, John K.; Wentworth, C. M.; Machette, Michael N. Preliminary map showing known and suspected active faults in Colorado; 1976; OFR; 76-154; Witkind, Irving Jerome, Preliminary map showing known and suspected active faults in Idaho; 1975; OFR; 75-278; Compiled by Witkind, Irving Jerome, Preliminary map showing known and suspected active faults in Wyoming; 1975; OFR; 75-279; Compiled by Witkind, Irving Jerome, Preliminary map showing known and suspected active faults in western Montana; 1975; OFR; 75-285; Compiled by Witkind, Irving Jerome, Geographic Names Information System (GNIS), Mapping, Remote Sensing, and Geospatial Data, Seismic Hazard Maps and Site-Specific Data, https://www.usgs.gov/natural-hazards/earthquake-hazards/faults. This movement may occur rapidly, in the form of an earthquake - or may occur slowly, in the form of creep. In fault …fault plane is called the hanging wall, or headwall; the block below is called the footwall. Some faults are active. At the time the Quaternary Fault and Fold database was established (1993), the Quaternary time period was defined as <1.6 Myr in the 1983 Geologic Time Scale, published in 1983. In fault …of inclination of a specific fault plane tends to be relatively uniform, it may differ considerably along its length from place to place. The Year of historic deformation requires a four-digit year in each field; use values that would encompass the historical record (such as 1600 and 2005) to search for all entries in this field. All of the maps were prepared by combining hazard derived from spatially- smoothed historic seismicity with hazard from fault-specific sources. A fault is a fracture in rock where there has been movement and displacement. ); instead search for the fault number only. Many modern web browsers have an “auto complete” function that will fill in data fields based on the first several characters or digits from your browser profile. See more. fault line synonyms, fault line pronunciation, fault line translation, English dictionary definition of fault line. In 1999, it was updated to 1.8 Myr, and in 2009 it was revised to 2.6 Myr. The plates move and crash toward each other. A reverse fault (if steeply dipping) or thrust fault (if shallowly dipping) is a fault where the fault plane dips toward the upthrown block. In 1993, the U.S. Geological Survey began developing a database for Quaternary faults and folds for the United States in earnest, largely supported by NEHRP but with significant support from many State surveys. horse. n 1. 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