Development of LP Wave Discrimination Capability Using LP Strain Instruments.
Abstract
The development of a design for a three-component strain/inertial complex is almost complete. The moving coil-permanent magnet technique has been selected for the primary transducer. Noise tests on the preamplifier demonstrated that using more turns of wire in the coil will give a 1.8 signal-to-noise improvement at periods longer than 20 sec without affecting the signal-to-noise ratio at shorter periods. Based on microseisms at Las Cruces, New Mexico, the ground motion signal will be larger than instrument noise at periods shorter than 90 sec and instrument noise will be larger at longer periods. The engineering model design is essentially complete and the field test installation has been planned. Preparation of the mine to be used for the installation near Queen Creek, Arizona, has required more excavation than anticipated to obtain rock with the highest integrity. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 30, 1969
- Accession Number
- AD0859128
Entities
People
- James E. Fix
- John R. Sherwin
Organizations
- Geotech Instruments (United States)