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| | = '''Use''' = | | = '''Use''' = |
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| − | This toolbox tab contains the parameters to select the part of the signal used for [[H/V_spectral_ratio|H/V]] or [[Spectral_amplitudes|Spectrum]] processing on which window selection is performed.
| + | [[Image:HV_SPEC_toolb_time.png|thumb|right|300px|''Time'' tab of the H/V and Spectrum toolboxes]] |
| − | The two series of parameters are described in two sections:
| + | The toolbox '''Time''' tab is used to customize the parameters for selecting the signal windows used for processing. |
| | + | Two series of parameters are described in two sections: |
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| | * the global time range section | | * the global time range section |
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| | * the time windows section | | * the time windows section |
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| − | A third section gives information on the number of selected windows obtained after applying to the signal the parameters of the two precedent sections. | + | A third section gives information on the number of selected windows obtained after applying the parameters defined in the two precedent sections. |
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| − | At the very bottom two buttons indicate whether to [[Geopsy: Load_Toolbox_Parameters|load parameters]] from previouly processed data or to [[Geopsy: Load_Toolbox_Parameters|start]] signal processing.
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| − | [[Image:HV_SPEC_toolb_time.png|thumb|center|300px|''Time'' tab of the H/V and Spectrum toolboxes]]
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| | <br style="clear: both"/> | | <br style="clear: both"/> |
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| | = '''Time windows section''' = | | = '''Time windows section''' = |
| − | [[Image:HV_SPEC_toolb_time_windows.png|thumb|right|300px|''Time windows'' section in the ''Time'' tab of he H/V and Spectrum toolboxes]] | + | [[Image:HV_SPEC_toolb_time_windows.png|thumb|right|300px|''Time windows'' section in the ''Time'' tab of the toolboxes]] |
| − | Short-duration disturbances of the signal can be avoided during [[H/V_spectral_ratio|H/V]] or [[Spectral_amplitudes|Spectrum]] processing by using an anti-trigger window selection to remove the transients. The objective is to keep the most stationary parts of ambient vibrations, and to avoid the transients often associated with specific sources (footsteps, close traffic). This objective is exactly the opposite of the usual goal of seismologists who want to detect signals, and have developed specific trigger algorithm to track the unusual transients possibly indicating the start of an earthquake. Here an anti-trigger algorithm is used, which is exactly the opposite: it detects transients and tries to avoid them. For more information on this topic, it it suggested to consult the SESAME user guidelines <ref>Guidelines for the implementation of the H/V spectral ratio technique on ambient vibrations measurements, processing and interpretation, [http://SESAME-FP5.obs.ujf-grenoble.fr], 62 pages, April 2005</ref>. Windows are then processed individually to get H/V or Spectrum curves in all selected windows, which are then averaged. | + | Short-duration disturbances of the signal can be avoided during [[H/V_spectral_ratio|H/V]] or [[Spectral_amplitudes|Spectrum]] processing by using an anti-trigger window selection to remove the transients. The objective is to keep the most stationary parts of ambient vibrations, and to avoid the transients often associated with specific sources (footsteps, close traffic). This objective is exactly the opposite of the usual goal of seismologists who want to detect signals, and have developed specific trigger algorithm to track the unusual transients possibly indicating the start of an earthquake. Here an anti-trigger algorithm is used, which is exactly the opposite: it detects transients and tries to avoid them. For more information on this topic, it it suggested to consult the SESAME user guidelines <ref>Guidelines for the implementation of the H/V spectral ratio technique on ambient vibrations measurements, processing and interpretation, [http://SESAME-FP5.obs.ujf-grenoble.fr], 62 pages, April 2005</ref>. Windows are then processed individually to get H/V or Spectrum curves in all selected windows, which are then averaged |
| − | <br style="clear: both"/>
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| − | [[Image:Time_Windows_tabs.png|thumb|right|300px|The four sub-tabs of the ''Time windows'' section in the ''Time'' tab]]
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| − | This section comprises four sub-tabs:
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| − | *'''General''': window selection parameters
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| − | *'''Raw signal''': STA/LTA crieria applied to the raw signal
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| − | *'''Filter''': filtering criteria for applying STA/LTA on the filtered signal
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| − | *'''Filtered signal''': STA/LTA criteria applied to the filtered signal using the filtering criteria in the ''Filter'' sub-tab
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| − | <br style="clear: both"/>
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| − | == General sub-tab ==
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| − | [[Image: HV_SPEC_toolb_time_time_gen.png|thumb|right|300px|The ''General'' sub-tab in the ''Time windows'' section of the ''Time'' tab]]
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| − | This sub-tab contains the criteria used to select stable signal windows:
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| − | *Window length
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| − | *Window overlap
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| − | *Bad sample set-up
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| − | *Anti-triggering set-up
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| − | '''MAIN ARTICLE''': [[Geopsy: H/V and Spectrum Toolboxes: Time Tab: General sub-tab|General sub-tab]]
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| − | <br style="clear: both"/>
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| − | == Raw Signal sub-tab ==
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| − | [[Image: HV_SPEC_toolb_time_time_raw.png|thumb|right|200px]]
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| − | This sub-tab is divided into two sections:
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| − | * '''STA/LTA parameters section''' (to the left)
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| − | * '''Apply to section''' (to the right)
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| − | A box at the bottom indicates whether or not the anti-trigger is appllied to the raw signal.
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| − | '''MAIN ARTICLE''': [[Geopsy: H/V and Spectrum Toolboxes: Time Tab: Raw Signal sub-tab|Raw Signal sub-tab]]
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| − | <br style="clear: both"/>
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| − | == Filter sub-tab ==
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| − | [[Image: HV_SPEC_toolb_time_time_filter.png|thumb|right|300px]]
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| − | Contains the filtering parameters used in the ''Filtered Signal'' sub-tab [[Geopsy: Filter|''(more details)'']].
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| − | <br style="clear: both"/>
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| − | == Filtered Signal sub-tab ==
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| − | [[Image: HV_SPEC_toolb_time_time_filtered.png|thumb|right|300px]]
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| − | This sub-tab is divided into two sections.
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| − | * STA/LTA parameters section (to the left), includes STA length, LTA length, as well as minimum and maximum STA/LTA thresholds [[Geopsy: STA/LTA|''(more information)'']].
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| − | * ''Apply to'' section (to the right), indicates to which tracks the anti-trigger is applied (top, above the … : Vertical, North, East) and to which file (bottom underneath the … : "Strong Peak").
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| − | Simply check the boxes of the tracks and files that are to be processed.
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| − | == Windowing and data flow sub-section ==
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| − | Two boxes and one pop-up menu located at the bottom of the Time windows section are used to control windowing and real time data acquisition flow.
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| − | [[Image: Time-Time_select.png|300px]]
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| − | * ''Update'' box: should be checked when using geopsy for real time data acquisition. Checking the box when no data flow is entering has no effect on the processing.
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| − | * ''Common'' box: check this box to force selecting the same windows on all signal tracks, i.e. [[Geopsy: STA/LTA|STA/LTA]] threshold must be verified simultaneously on all tracks in order to keep a window. When the box is unchecked, [[Geopsy: STA/LTA|STA/LTA]] threshold must be verified on each track taken separately. There is no need to check this box in H/V processing, as in this case it is automatically applied.
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| − | [[Image: Common not checked.png|thumb|left|300px|Resulting windowing with the ''Common'' box unchecked]] [[Image: Common checked.png|thumb|left|300px|Resulting windowing with the ''Common'' box checked]]
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| − | <br style="clear: both"/>
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| − | * ''Select'' pop-up menu: used to determine which action is undertaken in the windowing process.
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| − | When the windowing has not yet been performed with the current parameters, a "*" is displayed besides Select [[Image: Time-General-Select_not_used.png|thumb|left|300px|''Select'' has not been used yet]]
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| − | <br style="clear: both"/>
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| − | When the windowing has already been performed with the current parameters, the "*" is no longer displayed besides Select [[Image: Time-General-Select_used.png|thumb|left|300px|''Select'' has already been used]]
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| − | <br style="clear: both"/>
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| − | The window selection process includes five possible actions.
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| − | <br style="clear: both"/>
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| − | [[Image: HV_SPEC_toolb_time_popup.png|thumb|left|300px|Options in ''Select'' pop-up menu]]
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| − | '''Auto''': windows are selected automatically using the criteria of the ''General'' sub-tab of the ''Time'' section.
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| − | '''Add''': manually add windows. Choose this option and then, with the cursor, select a zone in the signal display where windows have to be added. If an existing window is included in the zone it will not be affected. Note that a window is added only if the criteria of the ''General'' sub-tab of the ''Time'' section are fulfilled.
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| − | '''Remove''': manually remove windows. Choose this option and then, with the cursor, select a zone in the signal display where windows have to the removed.
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| − | '''Inverse''': select the windows that were previously not selected. When no windowing has been performed, applying ''Inverse'' will select windows all along the signal without applying the windowing criteria.
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| − | '''Clear''': automatically remove all windows.
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| − | '''Load''': load windows from previous processing stored in a [[Geopsy: Load Toolbox Parameters|name.log]] file.
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| − | <br style="clear: both"/>
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| − | [[Image: Windowing_Auto.png|thumb|left|300px|Resulting ''Auto'' windowing]]
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| − | <br style="clear: both"/>
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| − | [[Image: Windowing_Inverse.png|thumb|left|300px|Resulting ''Inverse'' windowing applied to the above ''Auto'' windowing]]
| + | '''MAIN ARTICLE''': [[Geopsy: H/V and Spectrum Toolboxes: Time Tab: Time windows|Time windows]] |
| | <br style="clear: both"/> | | <br style="clear: both"/> |
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| − | = Number of windows section = | + | = '''Number of windows section''' = |
| − | In the ''Number of windows'' section, underneath the [[Geopsy: H/V and Spectrum Toolboxes|''Toolbox'']] tabs, a pop-up menu and a numerical display are used to show the number of selected windows. | + | [[Image: View stations all.png|thumb|'right|300px|''Number of windows'' section]]In the '''Number of windows'' section, underneath the [[Geopsy: H/V and Spectrum Toolboxes: Time Tab: Time windows|Time windows]] tabs, a pop-up menu and a numerical display are used to show the number of selected windows. |
| − | | + | When '''all stations''' is displayed in the pop-up menu, the number of windows in the numerical display is the total number of windows selected over all the stations. It is also displayed when a single station is processed. |
| − | [[Image: View stations all.png|thumb|left|300px|''Number of windows'' section]]
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| − | When "all stations" is displayed in the pop-up menu, the number of windows in the numerical display is the total number of windows selected over the entire station set. It is also displayed when a single station is processed.
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| | <br style="clear: both"/> | | <br style="clear: both"/> |
| − | The number of windows selected in each station of a multiple processing may be displayed using the pop-up menu.
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| − | [[Image: View station pop-up.png|thumb|left|300px|Pop-up menu of the ''Number of windows'' section in the ''Time'' tab]]
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| | + | [[Image: View station pop-up.png|thumb|right|300px|Pop-up menu of the ''Number of windows'' section]] |
| | + | The number of windows selected in each station of a multiple processing may be displayed individually. |
| | <br style="clear: both"/> | | <br style="clear: both"/> |
| − | The number of windows of the selected station appears in the numerical display, and simultaneously the graphic display zooms on the selected station.
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| − | [[Image: View station 1 Station.png|thumb|left|300px|Number of windows of the selected station]]
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| | + | [[Image: View station 1 Station.png|thumb|right|300px|Number of windows of the selected station]] |
| | + | The number of windows of the selected station appears in the numerical display, and simultaneously a zoom of the selected station appears in the signal Graphic Sheet. |
| | <br style="clear: both"/> | | <br style="clear: both"/> |
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| − | = Load parameters and Start section =
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| − | The section at the bottom of the ''Time'' tab comprises two buttons.
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| − | [[Image: HV_SPEC_toolb_load_start.png|thumb|left|300px|Load parameters and Start section]]
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| − | <br style="clear: both"/>
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| − | * The ''Load parameters'' button is used to [[Geopsy: Load Toolbox Parameters|load parameters]] from previous H/V or spectrum processing stored in a ''name.log'' file ([[Geopsy: H/V parameter file|example]]).
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| − | * Press the ''Start'' button to start H/V or Spectrum processing.
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| − | If no window selection has been performed, a pup-up window appears.
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| − | [[Image:HV_toolbox_no_window_selected.png|thumb|left|300px|Pop-up window indicating that no window selection has been performed]]
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| − | <br style="clear: both"/>
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| − | Simply click on the ''Yes'' button and processing will follow its way with the current [[Geopsy: H/V and Spectrum Toolboxes| Toolbox]] parameters.
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| − | To perform user's windowing, click on the ''No'' button.
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| | = References = | | = References = |
| | <references/> | | <references/> |
Use
Time tab of the H/V and Spectrum toolboxes
The toolbox Time tab is used to customize the parameters for selecting the signal windows used for processing.
Two series of parameters are described in two sections:
- the global time range section
A third section gives information on the number of selected windows obtained after applying the parameters defined in the two precedent sections.
Global time range section
Global time range section in the
Time tab of he H/V and Spectrum toolboxes
Used to select the portion of the signal that will be processed (more informations).
Time windows section
Time windows section in the
Time tab of the toolboxes
Short-duration disturbances of the signal can be avoided during H/V or Spectrum processing by using an anti-trigger window selection to remove the transients. The objective is to keep the most stationary parts of ambient vibrations, and to avoid the transients often associated with specific sources (footsteps, close traffic). This objective is exactly the opposite of the usual goal of seismologists who want to detect signals, and have developed specific trigger algorithm to track the unusual transients possibly indicating the start of an earthquake. Here an anti-trigger algorithm is used, which is exactly the opposite: it detects transients and tries to avoid them. For more information on this topic, it it suggested to consult the SESAME user guidelines [1]. Windows are then processed individually to get H/V or Spectrum curves in all selected windows, which are then averaged
MAIN ARTICLE: Time windows
Number of windows section
Number of windows section
In the 'Number of windows section, underneath the Time windows tabs, a pop-up menu and a numerical display are used to show the number of selected windows.
When all stations is displayed in the pop-up menu, the number of windows in the numerical display is the total number of windows selected over all the stations. It is also displayed when a single station is processed.
Pop-up menu of the
Number of windows section
The number of windows selected in each station of a multiple processing may be displayed individually.
Number of windows of the selected station
The number of windows of the selected station appears in the numerical display, and simultaneously a zoom of the selected station appears in the signal Graphic Sheet.
References
- ↑ Guidelines for the implementation of the H/V spectral ratio technique on ambient vibrations measurements, processing and interpretation, [1], 62 pages, April 2005
