Investigations of the Seafloor Coupling Characteristics of the New ONR OBS and Related Questions
Abstract
A series of transient tests were conducted to determine the seafloor coupling characteristics of the new ONR Ocean Bottom Seismology. Seismic energy radiated from the main recording package as a result of motion of the recording package was also measured. The vertical coupling resonances of both the recording package and the sensor package are somewhat lower than those predicted by a simple model of soil-structure interaction, but are generally in agreement with the theory. The most important result of this study is that significant energy radiated from the recording package in response to horizontal motions of the recording package. When the sensor package is 1 m from the recording package, the amplitude of the recorded signal is similar to that recorded on the recording package. In the field, this effect will result in increased noise recorded by the sensors if the recording package is disturbed by seafloor currents or biological activity. The amplitude of this signal attenuates rapidly with distance, suggesting that an improved responses can be achieved by increasing the separation between the recording package and the sensors. This effect is much less severe for vertical disturbances of the recording package.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 10, 1992
- Accession Number
- ADA246241
Entities
People
- Anne Trehu
Organizations
- Oregon State University