Preliminary Results from a Shallow Borehole Tilt Array,

Abstract

A shallow borehole tilt array has been installed within the boundaries of a deep borehole tilt array. Preliminary conclusions are: (1) Rainfall has obvious transient influences on the tilt signal, and may also be causing long term changes in drift rate and direction; (2) Diurnal tilts appear to be contaminated with thermal-elastic and direct temperature effects; (3) Barometric pressure fluctuations do not cause any noticeable variation in the tilt signal; and (4) A cursory attempt to pack the sand, by banging on the installation pipe, appears to have reduced the instrument drift. It is possible that some or all of the above effects can be removed by the appropriate data analysis techniques. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Mar 29, 1977
Accession Number
ADA047523

Entities

People

  • James Lewkowicz
  • R. K. Mcconnell Jr

Tags

Communities of Interest

  • Advanced Electronics
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Air Force
  • Amplitude
  • Barometric Pressure
  • Boreholes
  • Data Analysis
  • Earth Tides
  • Massachusetts
  • Measurement
  • New England
  • Orientation (Direction)
  • Pore Pressure
  • Rainfall
  • Space Sciences
  • Surface Temperature
  • Thermal Stability
  • Tilt
  • United States

Readers

  • Geotechnical Engineering.
  • Inertial Navigation Systems.
  • Thermal Physics or Thermal Science.