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Expendable bubble tiltmeter for geophysical monitoring

Westphal, J. A. and Carr, M. A. and Miller, W. F. and Dzurisin, Daniel (1983) Expendable bubble tiltmeter for geophysical monitoring. Review of Scientific Instruments, 54 (4). pp. 415-418. ISSN 0034-6748. http://resolver.caltech.edu/CaltechAUTHORS:20120712-101416578

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Abstract

An unusually rugged highly sensitive and inexpensive bubble tiltmeter has been designed, tested, and built in quantity. These tiltmeters are presently used on two volcanoes and an Alaskan glacier, where they continuously monitor surface tilts of geological interest. This paper discusses the mechanical, thermal, and electric details of the meter, and illustrates its performance characteristics in both large ( > 10^(-4) radian) and small ( < 10^(-6) radian) tilt environments. The meter's ultimate sensitivity is better than 2 X 10^(-8) radians rms for short periods (hours), and its useful dynamic range is greater than 10^4. Included is a short description of field use of the instrument for volcano monitoring.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.1137408DOIUNSPECIFIED
http://rsi.aip.org/resource/1/rsinak/v54/i4/p415_s1PublisherUNSPECIFIED
Additional Information:© 1983 American Institute of Physics. Received 13 October 1982; accepted 21 December 1982. We thank James Gunn, Victor Nenow, and DeVere Smith for aid in the design and construction of these meters. We also appreciate the aid and encouragement of the Hawaiian Volcano Observatory staff, particularly Norman Banks and Arnold Okamura. This work was supported by internal Caltech funds, the U.S. Geological survey Volcanic Hazards Program, and USGS Contract 14-08-0001-19753.
Funders:
Funding AgencyGrant Number
CaltechUNSPECIFIED
USGS Volcanic Hazards ProgramUNSPECIFIED
USGS14-08-0001-19753
Subject Keywords:measuring instruments; geophysics; orientation; monitoring; bubbles; sensitivity; volcanoes; glaciers; mechanical properties; thermodynamic properties; electrical properties; performance
Classification Code:PACS: 91.30.-f; 93.85.-q
Record Number:CaltechAUTHORS:20120712-101416578
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120712-101416578
Official Citation:Expendable bubble tiltmeter for geophysical monitoring J. A. Westphal, M. A. Carr, W. F. Miller, and Daniel Dzurisin, Rev. Sci. Instrum. 54, 415 (1983), DOI:10.1063/1.1137408
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32381
Collection:CaltechAUTHORS
Deposited By: Aucoeur Ngo
Deposited On:12 Jul 2012 20:08
Last Modified:26 Dec 2012 15:30

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