Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 1985 | Published
Journal Article Open

Some observations on strong-motion earthquake measurement using a digital accelerograph


This paper presents results of a study of some of the characteristics of a PDR-1 digital strong-motion accelerograph. Results are presented for laboratory tests of the background noise level of the instrument, and these results are compared with previously reported observations for optical instruments. Noise levels for the digital instrument are found to be one or two orders of magnitude lower than for an analog optimal instrument. The paper discusses determination of displacement from acceleration data, and results of laboratory tests are presented. An instrument anomaly in the FBA-13 transducer is identified, a simple data correction algorithm proposed, and examples given. The paper also presents detailed results of a comparison of earthquake records obtained from side-by-side digital and optical analog instruments during an aftershock of the 1983 Coalinga earthquake.

Additional Information

© 1985 Seismological Society of America. Manuscript received 7 December 1984. The authors wish to acknowledge Raul Relles who installed the instruments in the Coalinga aftershock region. The authors also express appreciation to Tony Shakal of the California Division of Mines and Geology for processing the analog film records obtained from the Coalinga aftershock. The second author was supported under the IBM Resident Study Program. This project was sponsored in part by the National Science Foundation. The opinions expressed are those of the authors and do not necessarily reflect those of the sponsoring agency.

Attached Files

Published - 1225.full.pdf


Files (1.0 MB)
Name Size Download all
1.0 MB Preview Download

Additional details

August 19, 2023
October 17, 2023