If the resistance was zero, then the calculated fault current would go to. Pdf catalog of fault plane solutions for the earthquakes. A fault trace or fault line is a place where the fault can be seen or mapped on the surface. You can define the strike, dip, and rake angle of a fault and choose between different types of projections and focal hemispheres. This c program code will be opened in a new pop up window once you click popup from the right corner. Fault plane profiles are important because they show what is being juxtaposed across the fault. A fault trace is also the line commonly plotted on geologic maps to represent a fault. You can define the strike dip and rake angle of a fault and choose between. This website uses cookies to ensure you get the best experience. It is now necessary to find the fault current distribution in the various branches of the network and in particular the current flowing from a to x on the assumption that a relay at x is to detect the fault condition. Lets first consider base kva and kv for ht and lt side.
Fc2 mobile app quickly delivers fault current calculations in the palm of your hand. Calculate fault current at each stage of following electrical system sld having details of. This demonstration generates earthquake focal mechanism plots also called fault plane solution plots or simply beach balls. What are the possible senses of motion on the nodal planes. To do this, fault data was collected from many sources, and various faultlocation approaches were evaluated. On world maps, seismicity tends to locate along linear belts which define more active deformation compared to more. When there is a short circuit the resistance becomes very small, and that means the current becomes very large. Slip is defined as the relative movement of geological features present on either side of a fault plane. Catalog of fault plane solutions for the earthquakes occurred on the romanian territory.
Structural geology programs for the mac and windows by rick allmendinger of cornell university. Bussmann series fc2 available fault current calculator easily calculate available fault current anytime, anywhere fc 2 mobile app quickly delivers fault current calculations in the palm of your hand. These curves separate regions of the stereonet into zones where compressional seismic pwave motions and dilatational pwave motions radiate from an earthquake fault. Earthquake focal mechanism wolfram demonstrations project. The ability to determine the direction of motion on faults has provided a vital tool for understanding processes occurring at plate boundaries.
Robertson 1970, while recognizing that there is considerable variation, suggested that the peak cohesion be about 16% of the unconfined compressive strength. A fault plane profile fpp is a cross section in the plane of the fault that shows both the hanging wall and footwall cutoffs. When rocks slip past each other in faulting, the upper or overlying block along the fault plane is called the hanging wall, or headwall. Fault calculations are one of the most common types of calculation carried out during the design and analysis of electrical systems. Ohmslaw algorithms if we know the voltages and currents during a fault, we can use these to estimate the distance to the fault. Fault current calculations are based on ohms law in which the current i equals the voltage v divided by the resistance r. This c programming code is used to find the parametric equation plane. Identities proving identities trig equations trig inequalities evaluate functions simplify. Earthquake locations the systematic location of seismic events in a region can be used to identify causative seismic faults. To carry out successful fault plane solution you need. The fault is calculated based upon the current from the utility and from any motors in the project. We succeeded in subdividing the data set of the small and large earthquakes into 25 and 3 subsets, with the average misfit ranging from 3. When you click text, the code will be changed to text format. Earthquake mechanism and fault plane solution information is fundamental to.
Read more calculating auxiliary fault plane solutions given. This failure condition is shown graphically in figure 12. Scan qr code to download mobile app, open tab below for webbased version. We have calculated the auxiliary fault plane solution using the input of main fault solution in perl. A faults sense of slip is defined as the relative motion of the rock on each side of the fault with respect to the other side. This diagram was created in conceptdraw diagram using the plane geometry library from the mathematics solution. This sample shows the flowchart of an algorithm that can solve quadric equations. Mohrcoulomb failure an overview sciencedirect topics. Fault level at ht incoming power supply is 360 mva. A line plots as a point and a plane plots as a great circle.
I have asked the same question at seminars around the country and i find more people are using the system, but its always less than half the people in the room. By using this website, you agree to our cookie policy. The and and or gates described above, as well as a voting or gate in which the output event occurs if a certain number of the input events occur i. And we will also plot to solution to visualize the results. Makes pointtopoint fault current calculations easy. A fault plane is the plane that represents the fracture surface of a fault. Only 10 hands were raised, out of about 150 people in the room.
The scientific notation calculator converts any decimal to scientific notation. Macr1d is a onedimensional seismic traveltime calculator for. Fault plane solution or focal mechanism represnets the parameters of rupture plane i. Jun 27, 1988 the state plane coordinate system was brought up, and i asked everybody using state plane coordinates to raise their hand. Dynamics of faulting and fault plane solution springerlink.
These quantities igned to characterize the are reported, together with the fault plane solution, in the programs output. Software to download usgs earthquake hazard program. The values of z 1, z 2 and z 0 are each determined from the respective positive, negative and zero sequence impedance networks by network reduction to a single impedance note that the single phase fault current is greater than the three phase fault current if z 0 is less than 2z 1 z 2 note also that if the system is earthed through an impedance z n carrying current 3i 0 then an. Fault plane solution displays rightlateral strike slip faulting that having an extension of normal fault component with a dip of 65degrees and a mean displacement of. Faultplane solutions determined by waveform modeling. Bussmann series fc2 calculatorfault current calculation.
A mobile app and webbased application for determining the fault current of single and three phase systems with fuse selection and conductor sizing guides. Its a useful and convenient way to represent different algorithms in the form of flowcharts. In its basic form its goal is to determine the focal mechanism. This allows fault extraction and interpretation at unprecedented speeds and interpretation of the sharpest and most accurate fault plane geometries. These quantities igned to characterize the are reported, together with the faultplane solution, in the programs output. Explanation of immediate faulting or mechanism of earthquake is one of the most fascinating and significant problems in seismology. The focal mechanism of an earthquake describes the deformation in the source region that. Thus, the pole or normal of the auxiliary plane is a point on the stereonet which must be on the curve of the fault plane. Calculating auxiliary fault plane solutions given the main fault. Fault plane solution displays rightlateral strike slip faulting that having an extension of normal fault component with a dip of 65degrees and a mean displacement of 0.
General purpose stereographic projection program for plotting lines, planes, density contouring, rotations, etc. A fault plane solution is a way of showing the fault and the direction of slip on it from an earthquake, using circles with two intersecting curves that look like beach balls. Arithmetic mean geometric mean quadratic mean median mode order minimum maximum probability midrange range standard deviation variance lower quartile upper quartile interquartile range midhinge. This lesson introduces the students the idea about fault plane solution.
An experienced user spent 10 minutes creating this sample. The resolution of the resolved fault plane solution allows correlations with the stress field in the area. Keywords fault plane focal mechanism hanging wall moment tensor nodal plane. Two open conductors fault the shunt type of fault are classified as. Bussmann series fc2 available fault current calculator. The slope calculator helps find the slope of any line through two. These calculations involve determining the current flowing through circuit elements during abnormal conditions short circuits and earth faults. The state plane coordinate system was brought up, and i asked everybody using state plane coordinates to raise their hand. Earthquake glossary usgs earthquake hazard program. Fault plane profiles are a fundamental tool for prospect assessment as well as a first step in understanding seal behavior in existing fields. The moment tensor solution is typically displayed graphically using a socalled beachball diagram. Earthquake mechanism and fault plane solution information is. Gates are the logic symbols that interconnect contributory events and conditions in a fault tree diagram.
Determination of the fault plane using a single nearfield seismic. The companion programs fpplot and fppage plot the results on stereo nets for interactive viewing or for printing. Determination of the fault plane using a single nearfield. The equation is simple, just ohms law see figure 2. A fault is an abnormal or unintended connection of live elements. Calculating auxiliary fault plane solutions given the main. The pattern of energy radiated during an earthquake with a single direction of motion on a single fault plane may be modelled as a double couple, which is described mathematically as a special case of a second order tensor similar to those for stress and strain known as the moment tensor. The significant figures calculator performs operations on sig figs and shows you a stepbystep solution. Design master electrical rt is an addin for revit that calculates the available fault current at all of the panels and transformers in a project.
Find the equation of the plane containing the three points p 1 1, 0, 1, p 2 0, 1, 1, p 3 1, 1, 0. This provides valuable time to think about the prospect, as compared to rushing to finish the laborintensive task of manual fault picking with legacy software in the hopes that it will be complete. A fault plane solution is simply a method for using seismograms from an earthquake to study the faulting process. This problem is identical with changed numbers to the worked example we just saw. Fault plane definition of fault plane by the free dictionary. The identification of the fault plane should be possible, even with a single. The term focal mechanism or fault plane solution conventionally refers to fault orientation, the displacement and stress release patterns and the dynamic process of seismic wave generation. This c programming code is used to find the cartesian equation of a plane. Fault plane solutions are useful for defining the style of faulting in seismogenic volumes at depth for. Calculate and plotfaultplane solutions from firstmotion data. The physical process of elastic strain accumulation and the triggering mechanism are the basics to understand the earthquake kinematics.
Fault level calculator software free download fault. For example, suppose you are looking at bedding planes exposed in a quarry wall. Catalog of fault plane solutions for the earthquakes occurred. This provides valuable time to think about the prospect, as compared to rushing to finish the laborintensive task of manual fault picking with legacy software in the. A16 fault level on 11kv side for percentage impedance 100 x 10 of 10. This demonstration generates earthquake focal mechanism plots, also called fault plane solution plots or simply beach balls. Wbz using 470 fault plane solutions, which we determined for earthquakes with m. Attitude of planes a bedding, cleavage, foliation, joints, faults, axial plane are some of the geological structures that are represented as a plane. Fpfit is a fortran program that computes doublecouple fault plane solutions from pwave first motion data using a grid search method. All elements plotted pass through the center of the hemisphere, and their projection reflects where the plane or line intersects the outer hemispheric surface.
You can plot two types of features on a stereonet, a line e. P 2 indicating the additional pore pressure increase c f cot. Note also that if the system is earthed through an impedance z n carrying current 3i 0 then an impedance 3z n carrying current i 0 must be included in the zero sequence impedance network. It also determines the type of fault movement normal, reverse or strike slip. The term focal mechanism or faultplane solution conventionally refers to fault. The first three faults are the unsymmetrical faults. Variation of generator reactance during a fault fault calculations 12.
Fault plane solution how is fault plane solution abbreviated. The auxiliary plane is perpendicular to the fault plane. If the mohrcoulomb criterion is used to represent the residual strength the minimum strength reached by the rock subjected to deformation. Fortran code to get the auxiliary fault plane solutions. Geology the plane along which the break or shear of a fault occurs. Note that the single phase fault current is greater than the three phase fault current if z 0 is less than 2z 1 z 2. Graphical solution modified drawing parallels and perpendiculars with triangles first draw 2 lines which are perpendicular to the strike line aa and cc second, draw the right triangle, bdc.
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