Investigation of Seismic Wave Gage Analysis Techniques and Comparative Evaluation of the Seismic Wave Gage at Chetco River, Oregon
Abstract
High-energy wave environments have made the maintenance of traditional, in situ wave gages expensive and unreliable. An alternative to traditional gages is wave estimates based on microseismic measurements. Microseisms are small ground motions of relatively high frequency (compared with seismic activity) which are observed as a background noise on standard seismographs located close to the shoreline. It is generally accepted that microseismic activity is related to ocean waves and the amplitudes of microseisms often correlate with wave energy. This work evaluates an existing wave meter system during summer wave conditions using digitally recorded data and computer analysis and investigates microseismic analysis techniques which might be useful to improve the seismic wave-measurement system. Both time domain and spectral analysis procedures were applied to seismic data. Correlation with both primary and doubled wave frequency components were investigated. Overall accuracy of the estimates is considerably less than that of in situ wave measurement instruments used currently by the US Army Corps of Engineers. Subject terms: Chetco River, Measurement, Microseisms, Ocean waves, Oceanographic instruments, Oregon.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1990
- Accession Number
- ADA221548
Entities
People
- Gary L. Howell
- Joon P. Rhee
Organizations
- Coastal Engineering Research Center