Easy HVSR > Techniques in Easy HVSR

Directional sum

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.