H/V spectral ratio

This tool is used to obtain Horizontal to Vertical (H/V) spectral ratios from any type of vibration signals (ambient vibrations, earthquake…).

The example used for explanations is an ambient vibration recording. Download compressed signal file.

Loading and viewing signals

First load and view a signal.

H/V Toolbox

The toolbox may be opened in two different ways:

• if the signal window is already open clik on the H/V icon
• if the signal window is not open drag the file(s) from the file manager to the H/V icon

The toolbox shows up in the form it was previously closed, with the file name(s) in the header.

It comprises three tabs:

• time

• processing

• output

The time tab is divided into three parts:

• Global time range: used to select all or part of the signalto be processed.

Works like the Waveform/Cut basic signal processing under the Waveform menu.

• Time windows:
  • General: settings for time windows selection

Further readings

• Spectral ratios along a profile

• Mapping spectral ratios