Deep borehole strainmeter to measure earth strain
Abstract
A highly sensitive multicomponent strainmeter was designed for use in deep boreholes. A shallow-hole version of the deep-hole strainmeter was constructed and tested by operating it in a mine tunnel near the seismically active area around Mina, Nevada. The ability of the strainmeter to record tidal strains of approximately 1 x 10 to the minus 8th power in the horizontal direction and approximately 1 x 10 to the minus 9th power in the vertical direction was demonstrated.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1974
- Bibcode:
- 1974STIN...7526355M
- Keywords:
-
- Strain Gages;
- Tunneling (Excavation);
- Blueprints;
- Construction;
- Engineering Drawings;
- Holes;
- Holes (Mechanics);
- Nevada;
- Tides;
- Instrumentation and Photography