The types of directional sum implemented in Easy HVSR are:

 

NS direction

Is not performed any directional sum but is taken exclusively the trace in the North-South direction of the recording.

 

EW direction

Is not performed any directional sum is taken only directional but is taken exclusively the trace in the East-West direction of the recording.

 

Arithmetic mean

The two horizontal traces are summed together with a simple arithmetic mean.

 

Geometric mean

The two horizontal traces are summed together with a simple Euclidean mean.

 

Mean square

The two horizontal traces are summed together with the arithmetic mean of the squares.

 

 

© Easy HVSR 2015