Sign Convention

XYZ Convention

The following convention is used for the XYZ axes of Dips models:

• X-axis and Y-axis make up the horizontal plane.
• The positive Y-axis is North
• The positive X-axis is East.
• Z-axis is always the vertical axis and is positive upwards.

Trend and Plunge

• Trend is the rotation angle about the vertical Z axis measured from the Y axis (north). Positive is taken as rotating from the Y axis (north) towards the X axis (east).
• Plunge is the rotation angle downwards from the horizontal XY plane after the Trend angle is applied.