Tag Archives: inline

Data geometry: rotation angles for transmitters

MARE2DEM allows for arbitrary orientations of  transmitter dipoles. The orientation of  electric and magnetic dipole transmitters are described by the two angles of the dipole axis: the horizontal azimuth and the vertical dip angle.

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Example sources including the horizontal electric dipole (HED), vertical electric dipole (VED), horizontal magnetic dipole (HMD) and vertical magnetic dipole (VMD).  Since MARE2DEM allows for arbitrary source transmitter orientations, you only need to specify the source type as electric or magnetic in the data file and list its location and two orientation angles.
The transmitter azimuth is the angle of the dipole measured clockwise from the 2D strike direction x.
The transmitter azimuth is the angle of the dipole measured clockwise from the 2D strike direction x.  Thus, typical inline electric dipole CSEM data have a transmitter azimuth of about 90° (or 270°), while broadside data have a transmitter azimuth of  0° (or 180°).
The transmitter dip angle
The transmitter dip angle is defined as the angle down, clockwise from the azimuth of the transmitter.  A normal horizontal  electric dipole transmitter  has a dip of 0°.