H/V spectral ratio - Revision history

Gaillot at 14:49, 8 January 2013

2013-01-08T14:49:25Z

2013-01-08T14:34:25Z

H/V curve

2010-06-10T14:36:14Z

Introduction

2010-04-27T12:52:46Z

Saving results

2010-04-15T12:06:06Z

Introduction

2010-04-15T12:04:36Z

Introduction

2010-03-12T15:54:49Z

2010-03-12T15:39:55Z

Data processing

2010-03-12T15:37:27Z

Window selection

2010-03-12T15:34:08Z

Window selection

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 [[Category:Tutorials]]
 This a short tutorial presenting a step-by-step '''H/V''' method procedure, using some of the main parameters.
-more details: [[Geopsy: H/V and Spectrum Toolboxes|H/V and Spectrum Toolboxes]]

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 ==== H/V curve ====
 [[Image:HV_toolbox_HV_1.png|thumb|right|200px|H/V curve]]
-* The blak curve represents H/V geometrically averaged over all colored individual H/V curves The two dashed lines represent H/V standard deviation.
+* The black curve represents H/V geometrically averaged over all colored individual H/V curves. The two dashed lines represent the H/V standard deviation.
 * The grey area represent the averaged peak frequency and its standard deviation. The frequency value is at the limit between the dark grey and light grey areas.
 <br style="clear: both"/>
 [[Image:HV_toolbox_HV_pick_value.png|thumb|right|200px|Peak frequency and standard deviation values]]
-* 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.
+* Use the cursor to get information on the H/V peak. By sliding the cursor onto the H/V graph or title, the following information appear in a yellow frame: data file name, exact value of the H/V peak frequency and its standard deviation, exact value of the H/V peak amplitude and its standard deviation, and interpretation category.
 <br style="clear: both"/>

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 * '''enought common samples in time to be processed.'''
-So, the user has to be careful when the 3 signals of a same recording are loaded from 3 different files.
+So, the user has to be careful when the 3 signals of a same recording are loaded from 3 different files. In some early versions (before 2010-06-01), failing to fulfill those conditions may lead to results based on silently stacked signals, for instance, when signal [[Geopsy: Database#Field:Name|Name]] is no set in file header (e.g. [[Geopsy: Supported file formats#ASCII Multi column (rw)|column text files without header]]).
 As for the other [[Geopsy: Tools|tools]], the data may be processed:
 *from a [[Geopsy: Graphic|graphic viewer]], to verify the windowing and to display the results;
 *from a [[Geopsy: Table|table]]. In this case, Geopsy will display only the resulting curves.
 The reference document for the H/V processing is the SESAME user guidelines, which is strongly recommended for further reading <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>.

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 [[Image:HV_toolbox_save_graph.png|thumb|right|200px|Pop-up menu to save H/V graphics]]
-* The H/V graphics may be saved in various image formats.
+The H/V graphics may be saved in various image formats.
 * Right click in the left hand margin of the H/V graphics.
 * In the pop-up menu choose ''Export image''.
 <br style="clear: both"/>
 [[Image:HV_toolbox_save_format.png|thumb|right|200px|Directory were to save H/V graphics]]
-* Choose a destination folder, image format, and file name.
+* Choose a destination folder, the image format, and a file name.
 <br style="clear: both"/>
 == References ==
 <references/>

@@ Line 7: / Line 7: @@
 == Introduction ==
 [[Image:HV_toolbox_HV_mkup.png|thumb|right|300px|H/V curve example]]
-The technique originally proposed by Nogoshi and Igarashi <ref>Nogoshi and Igarashi (1971) On the amplitude characteristics of microtremor (part 2) (in Japanese with english abstract). Journal of seismological Society of Japan, 24, 26-40.</ref>, and wide-spread by Nakamura<ref>Nakamura, Y. (1989) A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. ''Quaterly Report of the Railway Technical Research Institue'' '''30''' (1), 25-30.</ref>, consists in estimating the ratio between the Fourier amplitude spectra of the horizontal (H) to vertical (V) components of ambient noise vibrations recorded at one single station.
+The technique originally proposed by Nogoshi and Igarashi <ref>Nogoshi M. and Igarashi T. (1971) On the amplitude characteristics of microtremor (part 2) (in Japanese with english abstract). Journal of seismological Society of Japan, '''24''', 26-40.</ref>, and wide-spread by Nakamura<ref>Nakamura, Y. (1989) A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. ''Quaterly Report of the Railway Technical Research Institue'' '''30''' (1), 25-30.</ref>, consists in estimating the ratio between the Fourier amplitude spectra of the horizontal (H) to vertical (V) components of ambient noise vibrations recorded at one single station.

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 [[Image:HV_toolbox_no_window_selected.png|thumb|right|300px|No selected windows pop-up window]]
-* If no window selection has been performed, a pup-up window appears.
+* If no window selection has been performed, a pop-up window appears.
 Simply click on the Yes button and processing will follow its way.

← Older revision		Revision as of 15:37, 12 March 2010
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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 [[Geopsy: Signal_Viewer\|''Signal viewer'']].	+	* Selected windows should appear as green rectangles on the [[Geopsy: Signal_Viewer\|''Signal viewer'']].<br/> Notice that the selected windows are common for the three components.

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 [[Image:HV_toolbox_result_wind.png|thumb|right|200px|Selected windows]]
 * Selected windows should appear as green rectangles on the [[Geopsy: Signal_Viewer|''Signal viewer'']].
 * [[Geopsy: H/V and Spectum Toolboxes: Time Tab#Time windows section |More options]] for selecting windows are available.
 == Processing parameters ==