~Dr. Distribution and Nature of Fault Architecture in a Layered Sandstone and Shale Sequence: An Example from the Moab Fault, Utah N. C. Davatzes1 Department of Geological and Environmental Science, Stanford University, Stanford, California, U.S.A. The fault core consists of a variety of fault rocks and entrained bodies of clastic host rocks, which indicate variation in strain intensity and deformation style. Donate to the newsroom now. [5] The basal Navajo Sandstone to top Entrada Sandstone interval is separated into six sedimentologically distinct stratigraphic units: the Navajo Sandstone, the Page Sandstone, the Dewey Bridge and Slick Rock members of the Entrada Sandstone, the Moab Tongue, and the Curtis Formation. [3] The Paradox Basin is part of the Colorado Plateau that formed during the Late Paleozoic. On March 4 th, 2019 around 10:22 a.m., a 4.5 magnitude earthquake struck 7 miles southeast of the town of Paradox. The largest earthquake within 30 miles of Moab, UT was a 3.6 Magnitude in 2020. Utah geological survey staff 1991 earthquake fault map of a portion of utah county utah. Clay smear is among the family of structures that detect fluid flow in sedimentary basins. sltrib.com © 1996-2021 The Salt Lake Tribune. A prominent hanging wall feature of the southern segment is the Moab Anticline, with a crestal collapse graben accommodated by an array of normal faults. Many studies have documented multiple episodes of fluid flow along the Moab Fault since its formation in the Permo-Triassic. One study by Berg and Skar5 analyzes the arrangement of fractures in damage zones of the Bartlett segment of the Moab Fault. The Moab Fault is a nearly vertical, normal fault (see links below) in the Paradox Basin of southeastern Utah. deductible, Report a missed paper by emailing subscribe@sltrib.com or calling 801-237-2900, For e-edition questions or comments, contact customer support 801-237-2900 or email subscribe@sltrib.com. Ground shaking caused by an earthquake can impact the bridges causing a disastrous failure of the Bridges. From the first viewpoint after entering the park; it shows the fault line. Moab police said there were no reports of damages as a result of the earthquake, but was widely felt across southeast Utah and southwest Colorado, according to AP. This area consists of a heterogeneous series of dominantly clastic sedimentary rocks. According to Foxford et al.,[1] the most important feature of the Moab Fault zone from the standpoint of seal potential assessment is the nearly constant presence of at least one shaley gouge layer. The Moab Fault has been the focus of a number of studies, covering a range of topics including fault zone architecture, fault cementation, and fault seal prediction. It is suggested that red sandstones adjacent to the Moab Fault were bleached by reducing fluids. The 1992 St. George earthquake was a M w 5.8 earthquake that occurred on September 2, 1992 at approximately 4:26 AM MDT along the Washington Fault zone near the larger Hurricane Fault about 5 miles (8.0 km) southeast of St. George in Utah, United States. The architecture of the Moab fault zone is highly variable, and has been studied by several authors. The mixed mudstone-sandstone sequences include interbedded fluvial and aeolian sandstones and floodplain/lacustrine mudstones and siltstones. The shale gouge ratio is one way to describe the amount of clay smear in a fault zone, and is simply defined as the percentage of shale/clay in the slipped interval. The University of Utah Seismograph Stations said in a news release that the epicenter of the earthquake was in Paradox Valley in western Colorado. [3] The overall geometry of the southern fault segment is that of a faulted anticline, modified by a minor component of normal drag adjacent to the fault. The Salt Lake Tribune, Inc. is a 501(c)(3) public charity and contributions are tax The earthquake happened in an area where there are frequently small earthquakes triggered by underground saltwater injection, according to the release. This zone transfers the displacement along the fault from one segment to another. Thirty-seven transect exposures within the Moab fault zone were described. [7] use Ar-Ar dating to define the age of this fluid movement. Previous studies[10] show that a shale gouge ratio of ~20% defines the boundary between sealing and non-sealing faults, with faults sealing at shale gouge ratios above this ‘cut-off’ value. An earthquake fault in sandstone located near Death Valley National Park in California. The fault was reactivated at ~60 Ma, likely due to reinitiated salt movement during the Laramide Orogeny. Moab Fault. A 4.3 magnitude earthquake was felt by Moab residents on Saturday evening, according to the U.S. Geological Survey. Geologists think that earthquakes as large as 7.5 magnitude may occur in the Intermountain Seismic Belt in Utah, creating significant risk to the approximately 2.3 million Utahns who live close to the faults. Moab Fault, Utah 42 Front Range Fault, Colorado 43 Sierra Nevada, Manzanar, California 44 Owens Valley, California 45 Owens Valley, California 46 ... Faults, Earthquakes, and Simulations - California earthquakes commonly (5/14) rupture past mapped fault ends. Clearly the short seismic record will not image all the active faults that exist. FIELD METHODS We used two techniques to quantify the dis-tribution of deformation bands, joints, sheared joints, and breccia within sandstone units along the Moab fault. Faults are different from fault lines. There were 695 people who reported feeling the earthquake, yet there were … Share. The collapse occurred along steep faults, leaving cliffs on either side of the valley. No historical macroseismicity has been noted along the Moab Fault, and microseismicity studies have not revealed any earthquakes associated with the fault. These exposures provide excellent data on lateral variation and structure features within the fault zone. Faults are commonly buried by sediment and difficult to see, but the Moab fault is spectacularly exposed at the field trip site. Moab has had: (M1.5 or greater) 0 earthquakes in the past 24 hours 1 earthquake in the past 7 days; 3 earthquakes in the past 30 days; 23 earthquakes in the past 365 days At the north end of the Moab valley, there is a fault transfer zone, where the fault steps east. Normal faults move by a vertical motion where the hanging-wall moves downward relative to the footwall along the dip of the fault. The fault outcrop has a well-defined fault zone bordered by a damage zone of minor faults and fractures. • Effects of fault zone structures, particularly fault damage zones, on fluid flow and earthquake rupture propagation [the Moab Fault in USA, the 1957 Gobi-Altay earthquake in Mongolia]. A 4.3 magnitude earthquake was felt by Moab residents on Saturday evening, according to the U.S. Geological Survey. [8] suggest that following fault movement, the fault zone was the locus of vertical migration of over-pressured hydrocarbon and aqueous, carbonate-saturated fluids. 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. At 10:22 a.m., a reported 5.3-magnitude earthquake wobbled the Moab area and the surrounding region, with reports coming in to the Moab Sun News that it was felt in by people in Price and Blanding, and Paradox, Colorado. In March, a magnitude 5.7 earthquake struck Magna in Salt Lake County. The Moab fault is subdivided into northern, central, and southern parts based on fault geometry, varying amounts of displacement along strike, geomorphic trends (including reversed scarp topography along the northern part), and concealment of the fault beneath Quaternary basin fill along the southern part (Olig and others, 1996 #1371). As of January 12, 2017, the USGS maintains a limited number of metadata fields that characterize the Quaternary faults and folds of the United States. Solum et al. Lessons from earthquake disasters around the world, however, tell us that we CAN have some control on the outcome in terms of casualties and losses. There have been 13 earthquakes, including the one today, of magnitude 3.0 or greater since 1997 within 16 miles of the epicenter of today’s quake. The earthquake that shook desks in Moab had its epicenter near a little-known federal wastewater facility near Bedrock, Colorado. Home. in 1998, which classified architectural elements into slip band zones, shaley gouge zones and sandstone cataclastics and breccias. In the 1880s, renowned geologist G.K. Gilbert first reported fault scarps at the mouth of Little Cottonwood Canyon, approximately 20 km (12 miles) south of downtown Salt Lake City, and suggested the scarps were evidence of prehistoric ground-rupturing earthquakes. The architecture of the Moab fault zone is highly variable, and has been studied by several authors. The site area is in Uniform Building Code 1, indicating lowest potential for earthquake damage. in 1998,[1] which classified architectural elements into slip band zones, shaley gouge zones and sandstone cataclastics and breccias. (9 Crustal Deformation and Earthquakes – An Introduction to Geology, n.d.) “ Moab Fault ” by Andrew Wilson” is licensed under Public Domain. Fault lines in utah map. Spanning more than 185 miles (298 km) in New York, New Jersey, and Pennsylvania, it is perhaps the best known fault zone in the Mid-Atlantic region, and some small earthquakes have been known to occur in its vicinity. The Moab Fault lies deep beneath the site, but it does not pose a significant earthquake or surface-rupture threat to the tailings pile and is not a capable fault under NRC siting criteria. Permeability along the fault may have been promoted by the highly anisotropic shaley gouge fabrics or by fault zone fractures. Jana Pursley, a USGS geophysicist, said the earthquake happened in a fairly remote area so it shouldn’t have affected any homes or buildings. It is now on the same level as the Entrada Sandstone (Dewey Bridge Member) east of the fault. Following its deposition, the salt was deformed to form a series of salt anticlines that were ultimately buried by 1–2 km of Jurassic to Tertiary sediments. These exposures provide excellent data on lateral variation and structure features within the fault zone… [8] Iron oxide reduction is concentrated within high permeability, well-connected sandstones and spatially associated with cemented veins – indicating that the reduction event coincided with vein formation, and thus with the final stages of faulting. The Moab Anticline is an asymmetric fold with a wavelength of approximately 1 km, an amplitude of 350 m and a length of over 10 km. Sandstone-rich intervals are primarily aeolian in origin. After analyzing geochemical data of carbonate cements and iron-oxide reduced sandstones from the Moab Anticline, Garden et al. 20%, but varies depending on the location of the transect. The first systematic study was conducted by Foxford et al. For over a century, geologists have documented tectonic fault scarps along the Wasatch fault zone. Movement on the basement faults began in the Proterozoic and was greatest during mid-Pennsylvanian Rocky Mountain tectonism. The earthquake happened in the area of Utah’s border with Colorado. The Moab Fault was active during a period between the Triassic and early Tertiary, with a break from mid-Jurassic until at least mid-Cretaceous. It is about 45 km (28 mi) long and has a maximum displacement of about 960 m (3,150 ft). These observations, combined with the extensive presence of shaley gouge even at low stratigraphic levels suggest that the Moab Fault was a conduit for fluid flow while supporting significant across-fault pressure differences. MOAB, Utah — A 4.5-magnitude earthquake struck near the Utah-Colorado border Monday morning and was felt in Moab. Chan et al. The cliffs to the southwest, which is called the Moab Rim, are … Within this zone there is very dense faulting. While fault rocks along the R191 location and Bartlett Wash are enriched in clays relative to protolith, those at Corral Canyon and Courthouse Canyon show little difference in composition relative to protolith, suggesting that fault rock formation at the latter locations is governed by mechanical as opposed to authigenic processes. ... it was a fairly considerable-sized fault … Moab has had: (M1.5 or greater) 0 earthquakes in the past 24 hours 0 earthquakes in the past 7 days; 0 earthquakes in the past 30 days; 21 earthquakes in the past 365 days Wabash Valley Seismic Zone (North America) - series of faults on the North American plate between Illinois and Indiana. The USGS said it occurred about 33 miles from Moab. Close up of a fault line or fracture in the earth - Flaming Gorge area - Utah This is an old fault (at least 50 years old ... Dead Tree Yellow Moab Fault Arches National Park Utah. Fault line or fracture in the earth. [6] use the distribution of calcite cement as an indicator of paleofluid migration. [9] Shale gouge ratio, when applied to sand-shale sequences, indicates the proportion of phyllosilicate material expected to be incorporated into the fault rock. Four people from Moab reported feeling the quake on the USGS’ website. The Moab Fault is one of the longest of several northwest-striking, northeast-dipping, Cenozoic normal faults in the Paradox Basin which are spatially associated with northwest-trending salt-cored anticlines. This earthquake was widely felt in southwestern Colorado and southeastern Utah, including the cities of Grand Junction, Colorado, and Moab, Utah. The presence and amount of clays in fault rocks is a useful indicator in determining: The presence of clays in fault rock influences both the mechanical and hydrologic properties of clay-bearing faults. Joint systems may be regional affecting many square miles. For the most up-to-date information, please refer to the interactive fault map. It was the state’s largest since a 1992 earthquake in St. George. Along the southern segment, footwall bed dips define a structural high symmetrically disposed about the point of maximum throw. Moab Fault The Moab fault is a major fault that parallels the Moab anticline just south of the Visitor’s Center. They infer that fault-parallel fluid flow was focused along fault segments overprinted by joints and sheared joints. (a) The faults are isolated. of the Moab fault. She said people felt the earthquake from a distance. First, the frequency, orienta- The sedimentation of the Moab area was primarily influenced by marine or lacustrine incursions into the margins of major Jurassic ergs. They determine a mineralization age of c. 25-20 Ma, which coincides with episodic uplift of the Colorado Plateau or with La Sal Mountains volcanism. The USGS database shows that there is a 1.09% chance of a major earthquake within 50km of Moab, UT within the next 50 years. The last Salt Lake County earthquake of at least a magnitude 5 was in 1962. This earthquake was followed by an M 2.0 aftershock at 10:41 am MST. Faults in the Honaker Trail Formation, Moab Canyon, Map depicting the regional geological setting of the Paradox basin, "Structure and content of the Moab fault zone, Utah, USA, and its implications for fault seal prediction", "Structure and content of the Moab Fault Zone, Utah, USA, and its implications for fault seal prediction", "Fault-related clay authigenesis along the Moab Fault: Implications for calculations of fault rock composition and mechanical and hydrologic fault zone properties", "Structural and diagenetic control of fluid migration and cementation along the Moab fault, Utah", "Diagenetic Hematite and Manganese Oxides and Fault-Related Fluid Flow in Jurassic Sandstones , Southeastern Utah 1", "An exhumed fill and spill hydrocarbon fairway in the Entrada Sandstone of the Moab Anticline, Utah", "Clay smear: Review of mechanisms and applications", https://en.wikipedia.org/w/index.php?title=Moab_Fault&oldid=1020307986, Creative Commons Attribution-ShareAlike License, Fault rock composition and mechanical and hydrologic fault zone properties, This page was last edited on 28 April 2021, at 11:16. [3] The stratigraphy of the outcropping fault zone can be divided into three lithological groups: mudstone-dominated, mixed mudstone-sandstone, and sandstone-rich sequences. [2] It is associated with two salt anticlines formed within the Fold and Fault Belt of the Paradox Basin in east-central Utah. In one study, Eichhubl et al. The internal geometry of the Moab fault zone is complex in terms of the numbers of slip zones, the partitioning of throw between them and the distribution of fault rocks, all of which vary over the fault surface. The most studied transects include the Moab Canyon, R191 Canyon, Corral Canyon, Courthouse Mine, Bartlett Wash, and Waterfall Canyon. These conclusions support Chan et al.’s[7] hydrogeologic model, which proposes that hydrocarbon and basin brines from Pennsylvanian source rocks migrated along the Moab fault, moving into the porous sandstone units where they interacted with oxygenated meteoric water. 2476 [3] Calcite, barite, ankerite, and pyrite cemented veins are found in immediate proximity of the fault. [1] The fault connects with the Tenmile Graben in the north and extends through the Moab-Spanish Valley to the south. Geoffrey Migiro December 12 2017 in Travel. Distinctive types of veining, calcite cementation and iron oxide reduction exist adjacent to the fault, especially in Jurassic Navajo and Entrada sandstones. [5] describe the occurrence of clay-rich fault along four fault zones: R191, Corral Canyon, Courthouse Canyon, and the Bartlett Wash exposure. Although the Moab fault and other faults in the Paradox-Basin are linked with salt structures, the interior part of the Colorado Plateau has low-level of Seismic-hazards. Berg and Skar[4] suggest that the most important cause for asymmetric strain distribution is the development of the hanging wall syncline and the resulting asymmetric stress pattern expected to exist during fault propagation. Drill holes have shown that this fault cuts through and parallels the middle of the 3.2 km (2 mile) wide Moab Valley salt wall. The Moab Fault is characterized by patterns of iron oxide reduction that also suggest the fault acted as a conduit for mineralizing fluids. The Moab Fault is a sharply defined brittle shear zone (1–10 m wide). Walter Arabasz, Director, University of Utah Seismograph Stations Excerpt from media interview concerning Sumatran earthquake: Sept. 7, 2005 The Moab Fault (Segment A) forms under the influence of the regional NE–SW extension direction (based on fault undulations on Segment A and the thick deformation bands set, described by Johansen et al., 2015). This map shows earthquakes known to have occurred within and surrounding utah from 1850 through december 2016 and mapped quaternary faults considered to be earthquake sources. Earthquake Information for Moab, Utah Moab, UT has a low earthquake risk, with a total of 3 earthquakes since 1931. Thirty-seven transect exposures within the Moab fault zone were described. [9] Clay smear processes are applied to instances of cross-fault flow when porous and permeable rocks, specifically sandstones and shales, are cut by normal faults. The Moab site is located in an area where evidence indicates that significant earthquakes are rare. The study found that a magnitude 5.7 earthquake, located 12 miles from the dam (at the Humboldt fault), is the smallest earthquake that could potentially cause significant damage. The Moab Fault, near Moab, Utah, United States, is an extensional fault that runs approximately NW-SE, passing to the west of the Arches National Park. [2][3][4] The first systematic study was conducted by Foxford et al. All rights reserved. The fault can be subdivided into three sections based on geometric and kinematic considerations and geomorphic expression. At a depth of 0.8 kilometers, the earthquake was originally reported as a 5.3 magnitude and could be felt as far as the city of Moab, Utah—roughly 35 miles northwest of Paradox, Colorado. The fault is composed of three main components: a poorly exposed southern section, a central section (where the greatest throws are found), and a complex branching northern section that tips out to the northwest. Thus it provides a measure of the seal capacity, as a shale layer in a fault zone may provide an effective seal to across-fault flow. Shale gouge is present in the Moab Fault at values >c. The earthquake happened in the … Geologists believe it occurred as the result of the dissolution-migration of subterranean salts (the Paradox evaporites) laid down by inland seas during the Pennsylvanian Epoch, ~300 million years ago (Mya). Archived report (descriptions no longer maintained) Moab fault and deformation zones (Class B) No. The following description is restricted to the role of these joints in the devel-opment of the Moab fault. Spanish Valley is a long, collapsed anticline (the figure above shows a notional cross section near Moab). The Honaker Trail Limestone has been shifted 2,500 feet upward on the west side of the fault, past seven other rock layers. 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