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

Iwan, Wilfred D. and Moser, Michael A. and Peng, Chia-Yen (1985) Some observations on strong-motion earthquake measurement using a digital accelerograph. Bulletin of the Seismological Society of America, 75 (5). pp. 1225-1246. ISSN 0037-1106.

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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.

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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.
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Issue or Number:5
Record Number:CaltechAUTHORS:20140902-105713596
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49107
Deposited By: Tony Diaz
Deposited On:02 Sep 2014 19:36
Last Modified:23 Aug 2021 22:46

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