The dip is necessarily at right angles to the strike. Department of Geology, Royal Holloway, University of London, Egham. (5) a change of physical parameters such as elastic moduli and pore pressure, and (6) stress field resulting from fault interaction. Strike Definition of strike The inclination or fall of a reef in its course exhibited in the cap, or sometimes in the thinning out or re-formation of a reef. Relationships between Cenozoic strike - slip faulting and basin opening in. From previous laboratories you should know that based on the Principle of Original Horizontality sedimentary beds are originally deposited as a series of horizontal layers one on top of another. (4) horizontal slip across pre-existing extensional fractures or dip-slip faults that have steps. Strike is the direction of a line produced by the intersection of an imaginary horizontal plane with an inclined bed. (3) segmentation of faults to accommodate curved fault traces. (2) faulting within a weak zone oriented slightly off a local failure plane. Some possible mechanisms that produce stepovers and control the sense of stepover are (1) bending of initially straight faults. Down-dip stepovers of both senses may produce strike-slip faults in orientations different from the initial major strike-slip faults that are arranged en echelon. Along-strike stepovers produce pull-apart basins und push-up ranges depending on the sense of stepover. Two types of stepover between strike-slip faults are considered in this paper: (1) along-strike stepovers that are due to en echelon arrangement of faults in map view, and (2) down-dip stepovers that are due to en echelon arrangement of faults in cross section. Retrieved 10 July 2021.Stepovers are fundamental features along strike-slip faults of various lengths. "Fault zone structure from topography: Signatures of en echelon fault slip at Mustang Ridge on the San Andreas Fault, Monterey County, California." 2010. "Ancient sag ponds add to diversity at HREC." Web. "An upper cretaceous sag pond deposit: Implications for recognition of local seismicity and surface rupture along the Kaibab monocline, Utah." Geology. ^ Nevada-Government Dictionary on Water Words, retrieved April, 3rd 2012.eastern Australia would have projected along strike into these areas (Figs. ^ THE SAG POND STORY - INTERPRETIVE TRAIL GUIDE, retrieved May, 9th 2017 Being >1 Mkm2 in area, and bounded by well-defined geologic and geographic.Various lagoons on the plateau of Pico Island in the Azores are the result of a graben. The direction which your thumb is pointing to is the direction of the strike. Finally, extend your thumb on the same plane. Rotate your hand so that the four fingers points down towards the dip direction. Some have been converted into reservoirs like the San Andreas Reservoir near San Bruno, California. Place your right hand on the surface (if the feature you are interested in is visible). Sag ponds of various sizes can be found along the San Andreas Fault, most notably within the Carrizo Plain and Sierra Pelona Mountains. Larger sag ponds are converted into reservoirs for public water sources, such as San Andreas Lake Examples Sag ponds have been converted into stock reservoirs. Aerial photography or high-resolution topography can easily determine their locations. Sag pond formation is common in California, and many of them can be found on the San Andreas Fault, which runs through the western part of the state. This line is called a strike line, and the direction the line points in (either direction, as a line points in two opposite directions) is the strike angle. When water enters the depression from rivers, streams, rainfall or snowfall, it fills the low-lying area, and a pond is the result. Strike refers to the line formed by the intersection of a horizontal plane and an inclined surface. Formation Ī sag pond is formed along a strike-slip fault, which may create a depression in the earth. ( April 2020) ( Learn how and when to remove this template message)Įlizabeth Lake is one of numerous sag ponds along the San Andreas Fault.Ī sag pond is a body of fresh water collected in the lowest parts of a depression formed between two sides of an active strike-slip, transtensional or normal fault zone. The method involves measurement of strike and dip of the rock layers or planar features. You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate. Dip is the angle at which a planar feature is inclined to the horizontal plane it is measured in a vertical plane perpendicular to the strike of the feature. Strike is the direction of a line produced by the intersection of an imaginary horizontal plane with an inclined bed. Strike and dip Geologists use a prescribed method of determining the attitude (or orientation in three-dimensional space ) of rock layers or any other planar geological feature (e.g., metamorphic foliation, fractures, faults, and tops of tabular units like formations). The examples and perspective in this article deal primarily with the United States and do not represent a worldwide view of the subject.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |