ORIENTATIONS OF LINES AND PLANES IN SPACE

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1 GG303 Lab 1 9/10/03 1 ORIENTATIONS OF LINES AND PLANES IN SPACE I Main Topics A Definitions of points, lines, and planes B Geologic methods for describing lines and planes C Attitude symbols for geologic maps D Reference Frames II Definitions of points, lines, and planes A Point 1 Defined by one set of coordinates (an ordered triple in 3-D) 2 Defined by distance and direction from a reference point 3 Intersection of two lines 4 Intersection of three planes B Line 1 Defined by two sets of coordinates 2 Defined by two points 3 Defined by distance from a reference point and the direction of the line Direction Reference point 4 Intersection of two planes C Plane 1 Defined by three sets of coordinates 2 Defined by three points 3 Defined by distance and direction from a reference point Plane (edge view) d Direction of line normal to plane Reference point 4 Defined by two intersecting or two parallel lines Stephen Martel Lab1-1 University of Hawaii

2 GG303 Lab 1 9/10/03 2 III Geologic methods for describing lines and planes A Orientations of lines 1 Trend & plunge a Trend: Direction (azimuth) of a vertical plane containing the line of interest. i Azimuth (compass bearing): direction of a horizontal line contained in a vertical plane. Measured by quadrant or ( ). Examples: N90 E, N90 W, S90 W, 2. ii The trend "points" in the direction a line plunges b Plunge: The inclination of a line below the horizontal 2 Pitch (or rake): the angle, measured in a plane of specified orientation, between one line and a horizontal line (see handout) B Orientations of planes 1 Orientation of two intersecting lines in the plane Strike & dip a Strike: direction of the line of intersection between an inclined plane and a horizontal plane (e.g., a lake); b Dip: inclination of a plane below the horizontal; 0 dip 90 c The azimuth directions of strike and dip are perpendicular d Good idea to specify the direction of dip to eliminate ambiguity, but right hand rule (see handout) can also be used. e Examples: Strike N90 W Dip 45 N right-handed Strike N90 W Dip 45 S left-handed: don t use f NOTE: Trend and plunge refer to lines; strike and dip refer to planes 2 Orientation of one special line in the plane Dip & dip direction (azimuth of dip) a Used mostly in Europe b Water runs down the dip direction 3 Trend & plunge of pole (unit normal) to plane 1 Pole is a line traditionally taken to point down 2 Pole trend = strike - 90 ; pole plunge = 90 - dip Stephen Martel Lab1-2 University of Hawaii

3 GG303 Lab 1 9/10/03 3 Attitude Symbol for a Plane and its Pole Map View Plunge Dip Cross section The pole trends 180 o from the direction the plane dips The plane dip and pole plunge sum to 90 o Pole Plane The plane appears as a line if viewed in the direction of strike IV Attitude symbols (strike and dip of a plane; trend and plunge of a line) 45 Plane strikes SW dips 45 to NW N 20 Line trends west; plunges 20 V Reference frames A Cartesian coordinates 1 Points are described by their x, y, z coordinates 2 The x,y, and z axes are right-handed and mutually perpendicular 3 Direction of a line a Given by the coordinates of pairs of points b Given by the difference in coordinates of pairs of points i x = x2 - x1 ii y = y2 - y1 iii z = z2 - z1 b Given by the angles ωx, ωy, and ωz. These are the angles between a line of unit length and the x, y, and z axes, respectively. The respective cosines of the these angles ( α, β, γ ) are called the direction cosines. Angle ωx ωy ωz Direction cosine α β γ 4 Length of a line ( ) 2 + ( y y 2 1 ) 2 + ( z z 2 1 ) 2 = x L = x 2 x 1 A line of unit length has a length of one. ( ) 2 + ( y) 2 + ( z) 2 Stephen Martel Lab1-3 University of Hawaii

4 GG303 Lab 1 9/10/03 4 B Cylindrical coordinates (3-D version of polar coordinates) 1 Point P is described by its ρ, θ, z coordinates a ρ = distance from the origin to P', where P' is the projection of point P onto x,y plane b θ = angle between x-axis and the OP' c z = distance from origin to projection of point P onto z-axis C Spherical coordinates 1 Points are described by their r, θ, φ coordinates a r = distance from the origin to point P Note: r here is different than ρ for cylindrical coordinates b θ = angle between x-axis and the OP', where P' is the projection of point P onto x,y plane c φ = angle between OP' and OP Note: In some spherical schemes, the angle between OP and the z-axis is used as the second angle. D Conversions between coordinate systems Cartesian Spherical Spherical Cartesian x = r cosφ cos θ α = cosφ cos θ r = x 2 + y 2 + z 2 1 = α 2 + β 2 + γ 2 y = r cosφ sin θ β = cosφ sin θ θ = tan-1 (y/x) θ = tan-1 (β/α) z = r sinφ γ = sinφ φ = sin-1(z/r) φ = sin-1(γ) Cartesian Cylindrical x = r cos θ y = r sin θ z = z Cylindrical Spherical Cylindrical Cartesian r = x 2 + y 2 θ = tan-1 (y/x) z = z Spherical Cylindrical Stephen Martel Lab1-4 University of Hawaii

5 GG303 Lab 1 9/10/03 5 ORIENTATION OF LINES AND PLANES PLANES Strike direction Horizontal Line Horizontal Line Plane Dip angle Dip direction Vertical plane Horizontal Line Horizontal Plane Right hand rule for strike and dip directions: If thumb on right hand points in the direction of strike the fingers on the right hand should point in the direction of dip LINES Horizontal Line Pitch Line 2 Plunge Line 1 Horizontal Line Trend Vertical plane Need to define orientation of plane for the pitch (rake) to have meaning The POLE to a plane is a line that is perpendicular to the plane. The trend of the pole is opposite the direction a plane dips. The plunge of a pole and the dip of a plane sum to 90. Stephen Martel Lab1-5 University of Hawaii

6 GG303 Lab 1 9/10/03 6 Vertical plane normal to strike of dipping plane a sin cos tan N f True dip b Trend, Plunge, & Pitch b Pitch Ψ Plunging line d c Line of strike for dipping plane Plunge Trend of line plunge (φ) pitch (Ω) dip (δ) Ψ a f a b e e f c c d b d e e f c a f a b c d b d e f a Vertical plane containing plunging line Dipping plane Pitch = angle between plunging line and the line of strike for the dipping plane (1) Trend = θ = strike + Ψ = strike + cos -1 (d/c) = strike + cos -1 {(cos Ω)/(cos φ)} (2) Trend = θ = strike + Ψ = strike + tan -1 (b/d) = strike + tan -1 {(cos δ)(tanω)} (3) Plunge = φ = sin -1 (a/e) = sin -1 {(sin δ)(sinω)} (4) Pitch = Ω = sin -1 (f/e) = sin -1 {(sinφ) / (sin δ)} Stephen Martel Lab1-6 University of Hawaii

7 GG303 Lab 1 9/10/03 7 Geologic Conventions for Measuring Orientations Compass Bearings By quadrant (relative to north or south). The angle does not exceed 90 By 360 azimuth (0-360 ) Examples N0 E N45 E N90 E S45 E S0 E S45 W S90 W N45 W Lines Trend: A compass bearing Plunge: An inclination below horizontal Examples: The lines below all plunge at. Their trends vary accordin g to the table above N Trend: N45 W Plunge: Trend: N45 E Plunge: Trend: 2 Plunge: Trend: 90 Plunge: Trend: S45 W Plunge: Trend: S45 E Plunge: Planes Strike: A compass bearing Dip: An inclination below horizontal Examples: The planes below all dip at. Their strikes vary according to the table above N Strike: 315 Dip: NE The "NE" is useful Strike: N90 E Dip: S The "S" is useful Strike: S45 W Dip: NW The "NW" is useful Stephen Martel Lab1-7 University of Hawaii

8 GG303 Lab 1 9/10/03 8 Note that the map has 1) A title 2) A north arrow 3) A scale 0 10 m MAP OF THE HIG BUILDING COURTYARD, UNIVERSITY OF HAWAII 8/20/94 SJM The dip line and strike line intersect at the point the measurement is taken The tail of the lineation arrow is at the point the measurement is taken. 7 This angle gives the strike of the plane. The plane dips 7 o Here a lineation is measured at the point the strike and dip measurements are taken. These long lines are parallel to the true north line on the side of the map. The edges of the courtyard are not east-west and north-south! Strike and trend are measured from these lines. 1 This angle gives the trend of the line. The line plunges 1 o. Room 131 Magnetic North True North Stephen Martel Lab1-8 University of Hawaii

9 GG303 Lab 1 9/10/03 9 Magnetic Declination and a Geologic Compass North Pole Hudson Bay (Magnetic North Pole) x Miss R. HI 0 When the declination is set correctly, if the compass body points to true north, then the magnetic needle of the compass points to magnetic north and the compass reads "0" White end of needle points north; black end points south 11 N MN MN N Hawaii New York Stephen Martel Lab1-9 University of Hawaii

10 GG303 Lab 1 9/10/03 10 Direction Cosines from Geologic Angle Measurements (Spherical coordinates) Positive z-axis up y = north; x = east xy plane is horizontal plane RIGHT-HANDED COORDINATES Remember: Trends are azimuths and are measured in a horizontal plane. Plunges are inclinations and are measured in a vertical plane. The direction cosines α and β are determined from OA, the length O of OA being OA = OA cos φ = cos φ. α = cos ω x = (cos φ) (sin θ) β = cos ω y = (cos φ) (cos θ) γ = cos ω z = - (sin φ) α 2 + β 2 + γ 2 = 1 Positive z-axis down x = north; y = east cos ωz z = up cos ωy Trend = θ Plunge = φ Unit Vector OA x = north y = north Orthographic Projection of vector OA onto xy plane cos ωx A A x = east xy plane is horizontal plane RIGHT-HANDED COORDINATES cos ωx Trend = θ A Remember: Trends are azimuths and are measured in a horizontal plane. Plunges are inclinations and are measured in a vertical plane. O Plunge = φ cos ωy y = east The direction cosines α and β are determined from OA, the length of OA being OA = OA cos φ = cos φ. α = cos ω x = (cos φ) (cos θ) β = cos ω y = (cos φ) (sin θ) γ = cos ω z = +(sin φ) α 2 + β 2 + γ 2 = 1 cos ωz Unit Vector OA z = down A Stephen Martel Lab1-10 University of Hawaii

11 GG303 Lab 1 9/10/03 11 Lab 1 1 Measure the strikes and dips of 4 of the planes in the HIG courtyard, and write them in the table below. (16 points total) Scoring: Strikes:1 pt if within 3, 1/2 pt if within 8 ; 1 pt for syntax Dips: 1 pt if within 3, 1/2 pt if within 8 2 Determine the trend and plunge of the pole to each of the four planes in step 1, and write them in the table below. (16 points total) Scoring: 1 pt for correct numerical calculation; 1 pt for correct syntax Plane ID# Strike Dip Pole trend Pole plunge (2 pts/box) (2 pts/box) (2 pts/box) (2 pts/box) A B C D E F 3 Plot the attitudes of the planes on the courtyard map. (8 pts total) Scoring: 1 pt for correct symbol and orientation 1 pt for correct location (± 1/2 box) 4 Measure the trends and plunges of 4 of the lines in the HIG courtyard, and write them in the table below. (16 points total) Scoring: Trends: 1 pt if within 3, 1/2 pt if within 8 ; 1 pt for syntax Plunges: 2 pts if within 3, 1 pt if within 8 Line ID # Trend Plunge Line ID # Trend Plunge A1 A2 B1 B2 C1 C2 D1 D2 E1 E2 F1 F2 5 Plot the attitudes of the lines on the courtyard map. (8 pts total) Scoring: 1 pt for correct symbol and orientation 1 pt for correct location (± 1/2 box) Stephen Martel Lab1-11 University of Hawaii

12 GG303 Lab 1 9/10/ m MAP OF THE HIG BUILDING COURTYARD, UNIVERSITY OF HAWAII 8/20/94 SJM Room 131 Magnetic North True North Stephen Martel Lab1-12 University of Hawaii

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