What is a Poor Quality Strong-Motion Record? |
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| Authors: | J Douglas |
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| Institution: | (1) Department of Civil and Environmental Engineering, Imperial College of Science, Technology and Medicine, London, SW7 2BU, United Kingdom |
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| Abstract: | Some accelerograms are affected by non-standard recording and digitization problems that mean they are often not used in strong-motion
studies. These non-standard problems cannot be corrected by the standard processing techniques that remove low and high-frequency
noise from the time-history. Records from analogue instruments are more prone to these problems but even records from digital
instruments, which are becoming increasingly common, can be affected by such errors. Since all strong-motion data is valuable
it is important to know whether any useful information can be obtained from accelerograms that are affected by such problems.
This article examines whether strong-motion records from analogue instruments that are missing their initial part due to late
triggering of the instrument and also strong-motion records from digital instruments with low A/D converter resolution can
be used for response spectral studies. It is found, by simulating such errors on high-quality strong-motion records, that
good response spectral ordinates can be obtained from such `poor-quality' records within the period range of most engineering
interest.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | accelerograph design low digitizer resolution response spectra S-wave trigger simulated errors strong-motion records |
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