### ppt-4

```野外測量與紀錄

• 1. 時間
• 2. 地點
• 3. 座標
• 4. 一般性描述
• 5. 露頭描述
• 6. 測量
• 7. 露頭描繪
• 8. 路線及構造簡圖
• 9. 分析與解釋
• 10. 其他
Structural geology
Structure
Ductile deformation
Brittle deformation
Fold
Foliation
Lineation
etc..
Joint
Tension gash
Styloite
Fault
Fault
etc..
Reconstruction of regional stress
Fault surfaces displaying the direction of slip lineation
Stereographic projection of a fault slip data set
Slickenside
lineation
pitch
Fault plane
pitch
Fault plane
Lower hemisphere project
Measurement includes
[LL_NNN_NNL_NNN ( or NNL)]
• 2 Letters (index 1 and 2) defining the structure
For striated fault
First letter
Second letter
C = clear
I = reverse fault
P = possible
N = normal fault
S = supposed
S = left-lateral strike-slip fault
D = right-lateral strike-slip fault
For bedding
N = normal
B = bedding
I = reversed
• a strike ( 3 numbers from 0 ~ 360)
• a dip (2 numbers + a letter) and
• if necessary, a new blank followed by the geometry of the Lineation : azimuth
( 3 number)*3, or pitch / rank (2 number + 1 letter)
2 numbers show the dipping angle from 0~90， 1 letter show the dipping direction
N, S, E or W
Method of right dihedrons
obtaining the orientation
of principal stress axes
from statistic method
STEREOGRAPHIC NET
S’/S = f (inclination)
S’/S = const.
Wuff net
Schmidt net
Wuff net (equiangular)
Schmidt net (equal-area)
OPM isosceles triangle
ON = OX, OX = (2)1/2 OH
ON/OP = tan (p/4-i/2)
OH/OP = sin (p/4-i/2)
ON = R tan (p/4-i/2)
ON = (2)1/2 R sin (p/4-i/2)
(Chang C. P., Unpubl.)

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