Find rake stereonet pdf

Structural geology laboratory university of south alabama. So, to find the orientation of lines plotted on a stereonet projection. The line of intersection between the plane and the sphere will then represent a circle, and this circle is formally known as a. Watch jr define the term rake and plot a line that rakes in a plane. Rake is the direction a hanging wall block moves during rupture, as measured on the plane of the fault. Rake is a program that is used to examine the stress regime in a region, using information from an earthquake database. Shogun method ebook free pdf download yes download now. It was originally known as the planisphere projection. On a pole plot, points are plotted on a stereonet that correspond to the orientation of either 1 linear features or 2 poles representing planes. Here we discuss the method used in crystallography, but it. Unlike structure contouring and other mapbased techniques, it preserves only the orientation of lines and planes with no ability to preserve position relationships. Extract the downloaded archive to any folder on your compu. John deere hay rake for sale tractor parts and replacement. How to use a stereonet to find the trend and plunge of a line plotted as a dot.

Plot the planes collected from the fold and the corresponding poles. Draw a line representing the strike line of the plane. Angle measured from the origination point of the great circle on the primitive circle. However, it is extremely useful, as orientation problems are. Small circles angles are slightly distorted and make the circles appear as ellipses. Introduction stereographic projection is a powerful method for solving geometric problems in structural geology. Software for stereographic projection there are several pieces of software that youd like to check out for that purposes. Fault data include both the fault plane and slicken line orientations, the latter including the. Stereonet practice problems do them first, then check solution on p.

Retrieving orientations from data on a stereonet if you are given a stereonet with data already plotted on it, you can retrieve the exact orientations of lines and planes by following the procedures outlined above, except in reverse. Stereographic projection is a method used in crystallography and structural geology to depict the angular relationships between crystal faces and geologic structures, respectively. Dotproc geoscientific analysis software dotproc software is designed to help geoscientists in the analysis of twodimentional 2d spatial data sets in a highly visual manner. To illustrate, we will find the true dip and strike of a plane for which we have measured two apparent dips. One of its most important uses was the representation of celestial charts. The stereographic projection was known to hipparchus, ptolemy and probably earlier to the egyptians. How to plot the rake of a line, given the strike and dip of a plane and the angle rake between the measured strike and the line. Project a slickenline lineation to that plane having a plunge of 43 e. Featuring john deere hay rake available for buying today online. Slickenlines on a fault plane represent the direction of some relative displacement between the two blocks separated by the fault. Planisphaerium by ptolemy is the oldest surviving document that describes it. Create any type of planar geologic fault, as well as faultbendfolds and blindthrust faults. Rotate the plotted point to one of the vertical great circles it does not matter which one.

The stereonet forms the surface of this lower hemisphere. Determing the strike and dip of a plane from a stereonet 1 rotate the tracing paper such that the two ends of the great circle that. This is a printable 2 degree equal angle wulff stereonet in pdf format. On a transparent overlay, mark the positions of the ns and ew axes, and the stereonet centre.

Given strike and one apparent dip find the true dip angle. Rake angle is a parameter used in various cutting and machining processes, describing the angle of the cutting face relative to the work. In trying to document the character of structural elements it is not uncommon to have hundreds of orientation readings. Count in along the great circle to find the plunge. Innstereo is a stereographic projection program or stereonet program for structural geology. Installing the application there is no installer provided. This video is a tutorial on plotting and reading rake or pitch on a stereonet. A tool has a positive rake when the face of the cutting tool slopes away from the cutting edge at inner side. Rakes the stereonet program supports rakes through the input of a plane and an orientation rake in that plane. Draw great circle projection of a fault plane with strike n. Find the trend and plunge of a line plotted on a stereonet. An online stereonet program that allows you to create and view all of your geologic stereonet information in 3d. The orientation of a plane is represented by imagining the plane to pass through the centre of a sphere fig.

In the example, the line was originally measured and plotted as a rake. A users manual for stereonet 9 is available within the lab materials folder at the geol305 sakai site. Solution using a stereonet proceed as follows see figures 3 and 4. Attitude measurements, true and apparent dips, and threepoint problems. Stereographic projection is about representing planar and linear features in a twodimensional diagram.

A pole plot is the most basic representation of the orientation data. You can assume that the fault has a negligible rotational component of rigid body deformation. The intercepts are projected onto a plan and labelled with the height of each intersection above a common datum. Tony obrien says this is the one for you following on from chord electronics recent fullsize announcements of its ultima pre 2 and new ultima 5 and 6. Rake is simply the angle between the strike direction and the lineation trend. Given two apparent dips solve for strike and true dip. Visible geology runs in the browser so there is no need to download anything, just click to add lines and double click to add planes. Trying to interpret such data plotted as raw orientations scatter plots on a stereonet, without further data treatment is difficult and susceptible to. Trend orientation of horizontal component measured from north plunge inclination downward from horizontal planes strike and dip quadrant notation 360 notation pole line normal to plane measured down lower hemisphere dip.

In fact, the stereonet is usually the tool of choice for solving these problems because of its speed. To find the trend, rotate the tracing paper back to normal, being careful not to lose track of the tick mark you just make. This arc is projected back up on to the stereonet to form a great circle figure 1b. Imagine a plane cutting through the centre of a lower hemisphere figure 1a. The threedimensional orientation of a line can be described with just a plunge and trend. This lab will give you practical experience using stereonets to plot your structural. Looking from above, where the plane touches the edge of the lower hemisphere is an arc. Stereographic projection the basics geological digressions. We collected a bunch of planar data from the limbs of a fold. Stereonet analysis of data from arbuckle mountains near. The orientation is converted automatically to a line with a trend and plunge, but still remains veiwable as a rake. The term planisphere is still used to refer to such charts. Checksums for the binaries are at the bottom of the page. Find the strike and true dip of the plane that contains these two apparent dips.

Pdf optional folds and stereonet practical chris wild. Rake drive controls are usually prov ided by the thickener vendor and are intended to protect the rake mechanism by monitoring condition s such as lubrication, cooling a nd hydraulic pressure. Plotting a plane using the stereonet next, rotate the transparency so the strike is at 0. Now you can find the great circle with the same dip 40 as the layer by counting 40 from the primitive circle along the 90 270 diameter. Pitch angles are in the range 090 o, with a pitch of 0 o being a line parallel to the strike, and a pitch of 90 o being a line parallel to the dip line. Diagrams illustrating strike, dip, trend, plunge, and the angle of rake that a line makes on a dipping plane. Other common uses for stereonets calculating rake we use rake to describe the angle between a plane and lineations on that plane. Gy360 structural geology net slip problem introduction with the attached figure and the data provided below, solve for the net slip vector for the fault which displaces dikes a and b on the map. Return the overlay to its original orientation and count off the trend. Workbook 2 stereonets school of earth and environment. The rake angle is measured from a specific end of the strike line so that end must be recorded with the rake angle ex. Releases innstereo is under development, but beta releases are already quite usable. Stereonet plotting reference sheet prepare to plot.

The main forms of data visualization in dips are the various plot options available in the view menu and view toolbar pole plots. The rake is a useful description of a line because often in geology features lines follow along a planar surface. Structural geology laboratory manual third edition table of contents laboratory 1. This will be a straight line across the center of the stereonet intersecting the outer circle at the strike bearing. The software is for free and it is an excel spreadsheet that can be used in both pc and macintosh platforms. Tractor parts and replacement reasonable prices of john deere hay rake and other similar listings. To find the trend, rotate the tracing paper back to normal, being careful not to lose track of the tick mark you just made.