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hodograms

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Journal Article
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (3): 849–862.
... exhibited in traditional crossplots such as intercept-gradient (A-B) or near trace–far trace (N-F). A benefit of the hodogram or polarization method is that the wavelet is taken into consideration. Crossplotted intercept and gradient are polarized along a “background trend” for nonanomalous events...
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Journal Article
Journal: The Leading Edge
Published: 01 January 2002
The Leading Edge (2002) 21 (1): 18–27.
... such as intercept-gradient (A–B) or near trace-far trace (N–F). A benefit of the hodogram or polarization method is that the wavelet is taken into consideration as it is convolved with the reflection coefficient series. Crossplotted intercept and gradient are polarized along a “background trend” for nonanomalous...
FIGURES | View All (11)
Journal Article
Journal: The Leading Edge
Published: 01 November 2001
The Leading Edge (2001) 20 (11): 1214–1224.
... of the crossplot. This problem can be addressed by cross plotting synthetic A and B traces, or N and F traces, etc. The result of this process is an AVO hodogram in which the AVO particle motion is polarized along the trend axis for nonanomalous events, and is polarized at angles different from the trend angle...
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Journal Article
Journal: Geophysics
Published: 01 January 1994
Geophysics (1994) 59 (1): 36–45.
...Hirokazu Moriya; Koji Nagano; Hiroaki Niitsuma Abstract We have developed a precise relative source location technique using acoustic emission doublets (AE doublets) in the triaxial hodogram method to evaluate the direction and distance of subsurface extension cracks. An AE doublet is a pair...
Journal Article
Journal: Geophysics
Published: 01 April 1989
Geophysics (1989) 54 (4): 508–513.
...K. Nagano; H. Niitsuma; N. Chubachi Abstract An automatic acoustic emission (AE) source location algorithm has been developed for downhole AE measurement of subsurface cracks by using the triaxial hodogram method. The P-wave arrival time is detected by analyzing crosscorrelation coefficients among...
Journal Article
Journal: Geophysics
Published: 01 October 1996
Geophysics (1996) 61 (5): 1453–1466.
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<span class="search-highlight">Hodograms</span> for the synthetic data for stations SDP, FLL, CIA, and JVA for ea...
Published: 01 June 2005
Figure 7. Hodograms for the synthetic data for stations SDP, FLL, CIA, and JVA for earthquake E1. The time window for hodogram is 4 sec and the time of onset of the shear wave is obtained from the field data. The times in the lower-right corner of each hodogram represent the time at which
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<span class="search-highlight">Hodograms</span> for the synthetic data for stations PHL, FLL, SPF, and JVA for ea...
Published: 01 June 2005
Figure 10. Hodograms for the synthetic data for stations PHL, FLL, SPF, and JVA for earthquake E2. The time window for hodogram is 4 sec and the time of onset of shear wave is obtained from the field data. The times in the lower-right corner of each hodogram represent the times at which
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The <span class="search-highlight">hodograms</span> for the field data set of stations SDP, FLL, CIA, and JVA for...
Published: 01 June 2005
Figure 6. The hodograms for the field data set of stations SDP, FLL, CIA, and JVA for earthquake E1. Splitting of the shear waves is seen only at the stations SDP and FLL, which are in a different fracture orientation than the source E1. The time window for each hodogram is 2 sec. The times
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The <span class="search-highlight">hodograms</span> for the field data set of stations PHL, FLL, SPF, and JVA for...
Published: 01 June 2005
Figure 9. The hodograms for the field data set of stations PHL, FLL, SPF, and JVA for earthquake E2. Splitting of the shear waves is seen only at the stations PHL and JVA, which are in a different fracture orientation than the source E2. The time window for each hodogram is 2 sec. The times
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<span class="search-highlight">Hodogram</span> plots for an example of a 3C shot showing particle motions of diff...
Published: 03 April 2023
Figure 11. Hodogram plots for an example of a 3C shot showing particle motions of different seismic events at near and far offsets. (a) The 3C shot gather, mixed traces, indicating the analyzed windows, over the first breaks (FB), coarse-grained layer (S1), and bedrock (B) reflections. (b) Trace
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<span class="search-highlight">Hodogram</span> for data in a vertical seismic profile for a horizontal force sour...
Published: 01 June 2005
Figure 4. Hodogram for data in a vertical seismic profile for a horizontal force source at depth 610 m. The number above each hodogram is the receiver depth. The receiver at the 594-m depth shows the first sign of polarization change. The hodogram for the 550-m depth shows establishment of a new
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Polarization attributes illustration using the <span class="search-highlight">hodogram</span>. (a) Original data ...
Published: 07 July 2021
Figure 4. Polarization attributes illustration using the hodogram. (a) Original data for earthquake data; (b) selected data from original data using two cursors (two red lines, C1 and C2); (c) 3D hodogram for particle trajectory of the selected data; and (d) 2D hodogram for particle trajectory
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Example <span class="search-highlight">hodogram</span> analysis with the primary particle motion indicated by the...
Published: 03 April 2019
Figure 3. Example hodogram analysis with the primary particle motion indicated by the red line in the bottom three hodograms. The hodograms with calculated primary particle motion (b-d) depict particle motion for different 2D planes and are determined for a 10 ms window, starting with the S-wave
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Concept of 3-D inversion for distribution of linearity of a 3-D <span class="search-highlight">hodogram</span> in...
Published: 01 January 2002
F ig . 4. Concept of 3-D inversion for distribution of linearity of a 3-D hodogram in the time–frequency domain. Azimuth and inclination of the hodogram are calculated from eigenvectors of the matrix SpWT ( b , a ). A virtual reflection point is treated as a scattering point. S -wave
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Comparison of <span class="search-highlight">hodogram</span> analysis with real microseismic data (receiver 7). C...
Published: 16 February 2012
Figure 11. Comparison of hodogram analysis with real microseismic data (receiver 7). Column (a) raw data. Column (b) data filtered with a low-pass frequency filter. Column (c) denoised data using the 3C sparse transform. Vertical lines in the first row delimit the hodogram window. Hodogram curves
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The particle motion plots (<span class="search-highlight">hodograms</span>) of body wave and Rayleigh wave at sta...
Published: 01 June 2006
Figure 6. The particle motion plots (hodograms) of body wave and Rayleigh wave at station CHY025 during event 1803. (a) The acceleration time series of horizontal (radial direction) and vertical components. (b) The displacement time series of horizontal (radial direction) and vertical components
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Comparison of <span class="search-highlight">hodogram</span> analysis for receiver three of the synthetic microse...
Published: 16 February 2012
Figure 6. Comparison of hodogram analysis for receiver three of the synthetic microseismic data set of Figure  5 . Column (a) synthetic data. Column (b) synthetic data contaminated with random noise. Column (c) noisy data filtered with a low-pass frequency filter. Column (d) denoised data using
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(a) Normalized energy response in wavenumber space for array data on 11 Feb...
Published: 04 June 2013
Figure 12. (a) Normalized energy response in wavenumber space for array data on 11 February 2009 before the earthquake. (b) Top-view hodogram. (c) North-view hodogram. The signals were not filtered.
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Example of SWS analysis of upper layers: (a) time series of R and T compone...
Published: 06 May 2022
Figure 12. Example of SWS analysis of upper layers: (a) time series of R and T component seismic signals, (b) hodogram of R and T components, (c) time series of the fast and slow S waves after time delay compensation, and (d) hodogram of fast and slow S waves after time delay compensation.