Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2948

Authors: Guillier, B.*
Atakan, K.*
Chatelain, J.-L.*
Havskov, J.*
Ohrnberger, M.*
Cara, F.*
Duval, A.-M.*
Zacharopoulos, S.*
Teves-Costa, P.*
Title: Influence of instruments on the H/V spectral ratios of ambient vibrations
Title of journal: Bulletin of Earthquake Engineering
Series/Report no.: 1/6 (2008)
Publisher: Springer Netherlands
Issue Date: 2008
DOI: 10.1007/s10518-007-9039-0
URL: http://www.springerlink.com/content/l077752450215r62/fulltext.pdf
Keywords: H/V technique
Instrumentation
Microtremors
Site effects
Abstract: For an optimal analysis of the H/V curve, it appears necessary to check the instrument signal to noise ratio in the studied frequency band, to ensure that the signal from the ground noise is well above the internal noise. We assess the reliability and accuracy of various digitizers, sensors and/or digitizer-sensor couples. Although this study is of general interest for any kind of seismological study, we emphasize the influence of equipment on H/V analysis results. To display the impact of the instrumental part on the H/V behavior, some series of tests have been carried out following a step-by-step procedure: first, the digitizers have been tested in the lab (sensitivity, internal noise...), then the three components sensors, still in the lab, and finally the usual user digitizers-sensors couple in lab and outdoors. In general, the digitizer characteristics, verified during this test, correspond well to the manufacturer specifications, however, depending on the digitizer, the quality of the digitized waveform can be very good to very poor, with variation from a channel to another channel (gain, time difference etc.). It appears very clearly that digitizers need a warming up time before the recording to avoid problems in the low-frequency range. Regarding the sensors, we recommend strongly to avoid the use of “classical” accelerometers (i.e., usual force balance technology). The majority of tested seismometers (broadband and short period, even 4.5 Hz) can be used without problems from 0.4 to 25 Hz. In all cases, the instrumentation should be checked first to verify that it works well for the defined study aim, but also to define its limit of use (frequency, sensitivity...).
Appears in Collections:04.06.10. Instruments and techniques
04.06.99. General or miscellaneous
Papers Published / Papers in press

Files in This Item:

File Description SizeFormatVisibility
Guiller_et_al_BEE2007t.pdfMain article1.9 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License
Creative Commons


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Share this record
Del.icio.us

Citeulike

Connotea

Facebook

Stumble it!

reddit


 

Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA