ROTATIONAL SEISMOMETER
Abstract
Elastic wave theory predicts that the elastic waves generated by an earthquake and other seismic events include a measurable component of horizontal elastic rotation. Several rotational seismometers have been designed to measure this rotational component. The first design consisted of a large inertial ring of mercury terminated in a coaxial set of stand pipes housing capacitive transducers to sense the displacement of the mercury in the stand pipes. The second design consisted of a continuous inertial ring of water with a thermistor transducer to detect flow within the pipe. The third design consisted of a continuous inertial ring of water with a thin paddle placed in the path of flow. Problems encountered involved spurious signals due to a 'flexible' pipe, electronic noise and drift, temperature stabilization, and moisture penetration into the transducers. The capacitive transducer seemed to be the most promising, and experimentation is continuing using this transducer within a rigid steel pipe.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 15, 1970
- Accession Number
- AD0712632
Entities
People
- Charles A. Dann
- Peter W. Rodgers
Organizations
- University of California, Berkeley