A Study of Secular and Tidal Tilt in Wyoming.
Abstract
During the period covered by this report, we completed the design and construction of a borehole tiltmeter array. The components were tested at two sites near Boulder, Colorado. After the tests were completed, we drilled 10 boreholes at 5 sites in Yellowstone National Park and installed tiltmeters there. Some sites were operational as early as January, 1981. The tilt data are interpreted to extract the amplitude and phase of the tidal admittance, the secular tilt rate and the broad-band noise. We have also constructed finite-element models of the sites to provide theoretical predictions for comparison with the measured admittances. The secular tilt data were compared with the other measurements such as changes in the level of Yellowstone Lake or with changes in the vertical datum deduced from levelling and gravity surveys. The residual noise spectra were examined for a sensitivity of the array to spurious effects such as barometric pressure or temperature. The comparisons between instruments is vital to this work to decide if a given signal is real.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1985
- Accession Number
- ADA176416
Entities
People
- Judah Levine
Organizations
- University of Colorado Boulder