A Measurement of Long Term Tilt in Colorado and Wyoming

Abstract

We have developed a borehole tiltmeter capable of operating for long periods of time at tidal sensitivity, and we have developed six of these tiltmeters at two sites near Boulder, Colorado. The data from the tiltmeters are recorded using a data acquisition and control system capable of recording the data from a large number of widely spaced instruments linked to a central site by means of telephone lines or radio links. We have also written analysis software to examine the power spectra of the tilt records, to extract the tidal admittance from time series and to evaluate the coherence between different instruments as a function of frequency. We have used our tilt array to measure the amplitude and phases of the major components of the earth tides, and we have examined the time dependence of the tidal admittance. We also have some preliminary estimates of the coherence between independent instruments at periods longer than one day. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1981
Accession Number
ADA108865

Entities

People

  • J. Christopher Harrison
  • Judah Levine

Organizations

  • University of Colorado Boulder

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Closed Loop Systems
  • Coding
  • Computer Programming
  • Computers
  • Control Systems
  • Convection
  • Cycles
  • Data Acquisition
  • Data Sets
  • Detectors
  • Earth Tides
  • Elastic Properties
  • Frequency Bands
  • Measurement
  • Operating Systems
  • Recording Systems

Readers

  • Acoustical Oceanography.
  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Inertial Navigation Systems.

Technology Areas

  • Space
  • Space - Space Objects