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CityShark

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Journal Article
Published: 01 November 2000
Seismological Research Letters (2000) 71 (6): 698-703.
...Jean-Luc Chatelain; Jean-Luc Chatelain; Philippe Gueguen; Philippe Gueguen; Bertrand Guillier; Bertrand Guillier; Julien Frechet; Francis Bondoux; Francis Bondoux; Jacques Sarrault; Pascal Sulpice; Jean-Marc Neuville © 2000 by the Seismological Society of America 2000 CityShark...
FIGURES | View All (8)
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Spectral amplitudes from a <b>CityShark</b>™ without sensor connected to the stati...
Published: 01 March 2013
Figure 11. Spectral amplitudes from a CityShark™ without sensor connected to the station and connected to a L28 Mark Product™ sensor. Plain black lines at the bottom of the graph represent the spectral amplitude of CityShark™ self‐noise obtained by recording the three inputs of the station short
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(a) Map of selected sites for  H&#x2F;V  measurements on noise with <b>CityShark</b> in...
Published: 01 August 2011
Figure 7. (a) Map of selected sites for H/V measurements on noise with CityShark in the Bagnères Valley; (b)  H/V spectral ratios (numbers refer to the sampled locations).
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▴ A view of the <b>CityShark</b> case, including the mainframe, internal battery, ...
Published: 01 November 2000
Figure 1. ▴ A view of the CityShark case, including the mainframe, internal battery, and flash card.
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▴ <b>CityShark</b> mainframe. The screen shows the station ready for the first rec...
Published: 01 November 2000
Figure 2. ▴ CityShark mainframe. The screen shows the station ready for the first record with a gain of 8,192, a 1-minute recording time (Long = 1), without automatic repeated recording (Rep = 0). “Ovf” indicates the percentage of clipped samples of the precedent record. The noise level shown
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▴ <b>CityShark</b> screen for date and time parameters set-up.
Published: 01 November 2000
Figure 3. ▴ CityShark screen for date and time parameters set-up.
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▴ <b>CityShark</b> screen for recording parameters set-up. “Long” is the recording...
Published: 01 November 2000
Figure 4. ▴ CityShark screen for recording parameters set-up. “Long” is the recording duration, from 1 to 60 minutes. “Rep” is the period of repeated recording, set to zero to be disabled. “Ovmx” is the maximum percentage of clipped samples.
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▴ <b>CityShark</b> screen while recording. The “Ovf” value is the percentage of cl...
Published: 01 November 2000
Figure 5. ▴ CityShark screen while recording. The “Ovf” value is the percentage of clipped samples of the record. “FileNam” is the name of the file where current data are stored. “Remaining time” indicates the minutes of recording left (during the last minute, the number of seconds left). “Amp
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▴ <b>CityShark</b> screen between two data acquisitions. Only the gain value can b...
Published: 01 November 2000
Figure 6. ▴ CityShark screen between two data acquisitions. Only the gain value can be changed by the operator without starting a procedure to reset the acquisition parameters. The “Ovf” value is the percentage of clipped samples of the preceding record. The portion of the name of the file
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▴ Example of data file created by <b>CityShark</b>. The ASCII file is obtained fro...
Published: 01 November 2000
Figure 7. ▴ Example of data file created by CityShark. The ASCII file is obtained from the binary file stored on CityShark's flash card. The recording parameters are written in a header, followed by the ambient noise amplitudes detected on the three components of the sensor (Z, North-South, East
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▴ Examples of building and site responses obtained using Nakamura's techniq...
Published: 01 November 2000
Figure 8. ▴ Examples of building and site responses obtained using Nakamura's technique ( 1989 ) with CityShark ambient noise records in 1998 and 1999 (A) on top of a church, before and after retrofitting work, and (B) on the same site on a sidewalk next to the church. Data in 1998 were obtained
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Picture of one tree instrumented with 6 three‐component Lennartz 1 s veloci...
Published: 10 January 2018
Figure 3. Picture of one tree instrumented with 6 three‐component Lennartz 1 s velocimeters positioned along the tree trunk at different heights and connected to the 24 bits CityShark digital acquisition system.
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The horizontal-to-vertical spectral ratios on ambient noise. (a) Examples o...
Published: 01 August 2011
Figure 6. The horizontal-to-vertical spectral ratios on ambient noise. (a) Examples of results obtained at BBCA and BBCM with the accelerometer of the temporary stations (gray), and with the velocimeter of the CityShark instrument (black). For clarity, the confidence level (one standard deviation
Journal Article
Published: 01 March 2013
Seismological Research Letters (2013) 84 (2): 199-209.
...Figure 11. Spectral amplitudes from a CityShark™ without sensor connected to the station and connected to a L28 Mark Product™ sensor. Plain black lines at the bottom of the graph represent the spectral amplitude of CityShark™ self‐noise obtained by recording the three inputs of the station short...
FIGURES | View All (13)
Journal Article
Published: 01 August 2011
Bulletin of the Seismological Society of America (2011) 101 (4): 1912-1937.
...Figure 7. (a) Map of selected sites for H/V measurements on noise with CityShark in the Bagnères Valley; (b)  H/V spectral ratios (numbers refer to the sampled locations). ...
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Journal Article
Published: 13 July 2016
Seismological Research Letters (2016) 87 (5): 1112-1119.
... times, obtained after correction for the travel‐time obliquity. Ambient vibrations were recorded next to each of the nine boreholes, with a CityShark station ( Chatelain et al. , 2000 , 2012 ) coupled to a three‐component 5 s Lennartz seismometer at a 200  samples/s sampling rate for 15 min...
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Journal Article
Published: 01 November 2008
Seismological Research Letters (2008) 79 (6): 816-819.
.... Bondoux , J. Sarrault , P. Sulpice , and J.-M. Neuville ( 2000 ). CityShark: A user-friendly instrument dedicated to ambient noise (microtremor) recording for site and building response studies . Seismological Research Letters 71 ( 6 ), 698 – 703 . Chatelain , J.-L. , B...
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Journal Article
Published: 01 September 2012
Seismological Research Letters (2012) 83 (5): 798-805.
... recorded with CityShark stations ( Chatelain et al. , 2000 ) coupled to a three‐component 5‐s Lennartz seismometers, a combination that has proven to be suitable for this type of experiment ( Guillier et al. , 2008 ). Recordings have a sampling rate of 100 or 200 samples per second (sps), in accordance...
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Journal Article
Published: 10 July 2018
Bulletin of the Seismological Society of America (2018) 108 (4): 2170-2182.
...) seismometer coupled with a 24‐bit Cityshark II system was used in this survey. The sites 1–4 (see Fig.  1 for locations), which are closer to the boreholes, are considered for the analysis at undamaged and damaged sites. The horizontal‐to‐vertical (H/V) spectral ratio (HVSR) is obtained for all the single...
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Journal Article
Published: 10 January 2018
Seismological Research Letters (2018) 89 (2A): 582-593.
...Figure 3. Picture of one tree instrumented with 6 three‐component Lennartz 1 s velocimeters positioned along the tree trunk at different heights and connected to the 24 bits CityShark digital acquisition system. ...
FIGURES | View All (12)