Difference between revisions of "H/V spectral ratio"
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| − | [[Image:HV_toolbox_time_sta.png|thumb|right|200px|''Raw signal'' sub-tab in ''Time'' tab of the toolbox with anti-trigger parameters]] | + | [[Image:HV_toolbox_time_sta.png|thumb|right|200px|''Raw signal'' sub-tab in ''Time'' tab of the toolbox with the anti-trigger parameters]] |
| − | * Click on the [[Geopsy: | + | * Click on the [[Geopsy: Toolbox_time_rawsignal|''Raw signal'' sub-tab]] in [[Geopsy: Toolbox_time_rawsignal|''Time'' tab]], to check that the anti-trigger parameters are as in the example window. |
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[[Image:HV_toolbox_window_popup.png|thumb|right|200px|Select pop-up menu]] | [[Image:HV_toolbox_window_popup.png|thumb|right|200px|Select pop-up menu]] | ||
| − | * Click on the ''Select'' button and select Auto. | + | * Click on the ''Select'' button and select ''Auto''. |
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[[Image:HV_toolbox_window_time_postsel.png|thumb|right|200px|Number of selected windows]] | [[Image:HV_toolbox_window_time_postsel.png|thumb|right|200px|Number of selected windows]] | ||
| − | * The number of selected windows appears at the bottom right corner of the | + | * The number of selected windows appears at the bottom right corner of the ''Time'' tab. |
The number of windows should be as in the example. | The number of windows should be as in the example. | ||
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[[Image:HV_toolbox_result_wind.png|thumb|right|200px|Selected windows]] | [[Image:HV_toolbox_result_wind.png|thumb|right|200px|Selected windows]] | ||
| − | * Selected windows should appear as green rectangles on the | + | * Selected windows should appear as green rectangles on the [[Geopsy: Toolbox_time_rawsignal|''Signal viewer'']]. |
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Revision as of 11:07, 9 March 2010
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.
The reference document for the H/V processing is the SESAME user guidelines, which is strongly recommended for further reading [1].
Contents
Getting ready
- Download compressed signal file.
- Load and view these downloaded signals.
- Select H/V in menu Tools (alternative ways to start a tool)
Window selection
- Make sure that the H/V Toolbox is showing the Time tab, and that parameters are set as in the example window.
- Click on the Raw signal sub-tab in Time tab, to check that the anti-trigger parameters are as in the example window.
- Click on the Select button and select Auto.
- The number of selected windows appears at the bottom right corner of the Time tab.
The number of windows should be as in the example.
- Selected windows should appear as green rectangles on the Signal viewer.
Processing parameters
- Click on the Processing tab, and make sure that parameters are as in the example window.
Output parameters
- Make sure you are in the Output tab, and that parameters are as in the example window.
Data processing
- Click on Start button at the bottom of the toolbox, whatever tab is displayed.
- In case no window selection has been performed, a pup-up window appears.
Simply click on the Yes button and processing will follow its way.
Results
Signal diplay
- Selected windows are colored, matching colours in he H/V graphics, i.e. colour of individual H/V curves have the same colour as the signal windows.
H/V curve
- The blak curve represents H/V averaged over all colored individual H/V curves The two dashed lines represent H/V standard deviation.
- The grey area represent the peak frequency and its standard deviation. The frequency value is at the limit between the dark and clear areas.
* Use the cursor to get values on the H/V curve. The exact value of the H/V peak frequency and its standard deviation may be obtained by sliding the cursor onto the H/V curve title (Strong_peak) in the upper right corner above the graphics.
Changing H/V graphics appearance
- It is possible to change the appearance of the H/V graphics using a make-up.
- To do so, first download the compressed make up file.
- Then click with the right button in the right hand margin of the H/V graphics
- Select Restore make-up in the pop-up menu and then select HV_Makeup.mkup file
- The appearnace of the H/V graphics is now at the user's taste.
