Welcome to the Ocean-Bottom Seismometer Facility established at the Scripps Institution of Oceanography by the Office of Naval Research (ONR). Here you will find information about the ONR OBS instruments, experiment scheduling, as well as links to other sources of related information.
They are autonomous seismic recording instruments which are dropped to the seafloor, where they record data and return to the sea surface upon acoustic recall. Simply put, they perform the functions of a seismic observatory while resting on the sea floor.
To further Navy needs and to serve the broader scientific community, ONR supported the design and construction of the instruments and established instrument two centers; One at the Scripps Institution of Oceanography and the other at The Woods Hole Oceanographic Institution. Both centers maintain fleets of Ocean-Bottom Seismographs (OBSs) and associated equipment as a shared resource for use by the members of the scientific community (Jacobson and others, 1991). The facilities are operated on a self-supporting basis, with support from the marine programs of the National Science Foundation and the Office of Naval Research.
This is what they look like.
|Figure 1. Elevation view of OBS||Figure 2. Plan view of OBS||Figure 3. OBS Launch||Figure 4. OBS Over Water|
Past, present and planned Experiments
|Sept 1994 - Jan 1995: LABATTS- Lau Basin - LeRoy Dorman, J. Hildebrand, SIO; D Wiens, Washington U.|
|Depth extent of the Lau back-arc spreading center and its relation to subduction processes, Dapeng Zhao, Yingbao Xu, Douglas Wiens, LeRoy M. Dorman, John Hildebrand, Spahr Webb Science, 278, 254-257, 1997 abstract|
|Modeling the Tonga Slab: Can Travel Time Data Resolve a Metastable Olivine Wedge? Keith D. Koper, Douglas A Wiens, LeRoy M. Dorman, John A. Hildebrand, Spahr C. Webb, J. Geophys. Res., In review, 1998|
|Seismic Attenuation Tomography of the Tonga Fiji Region Using Phase Pair Methods , Erich G. Roth, Douglas A. Wiens, LeRoy M. Dorman, Spahr C. Webb, John A. Hildebrand, J. Geophys. Res., In review, 1998|
|Sept 1995 - May 1996: Mantle ELectromagnetics and Tomography (MELT) (TN061 Cruise Report) , Southern EPR - Don Forsyth, Brown University|
|1998 Imaging the Deep Seismic Structure Beneath a Mid-Ocean Ridge: the MELT Experiment, T. M. S. Team, Science, 280, 1215-1218, 1998. abstract, full text in pdf|
|1998 Off-Axis Crustal Thickness Across and Along the East Pacific Rise Within the MELT Area, J. P. Canales, R. S. Detrick, S. Bazin, A. J. Harding, J. A. Orcutt, abstract,|
|1998 Shipboard Geophysical Indications of Asymmetry and Melt Production Beneath the East Pacific Rise Near the MELT Experiment, D. S. Scheirer, D. W. Forsyth, M. Cormier, K. C. Macdonald, abstract,|
|1998 Mantle Seismic Structure Beneath the MELT Region of the East Pacific Rise from P and S Wave Tomography D. R. Toomey, W. S. Wilcock, S. C. Solomon, W. C. Hammond, J. A. Orcutt, abstract|
|1998 Structure of the Upper Mantle Under the EPR from Waveform Inversion of Regional Events, S. C. Webb and D. W. Forsyth, abstract,|
|1998 Shear-Wave Splitting and Implications for Mantle Flow Beneath the MELT Region of the East Pacific Rise, C. J. Wolfe and S. C. Solomon, abstract,|
|1998 Mantle Discontinuity Structure Beneath the Southern East Pacific Rise from P-to-S Converted Phases Y. Shen, A. F. Sheehan, K. G. Dueker, C. de Groot-Hedlin, H. Gilbert, abstract,|
1998 Phase Velocities of Rayleigh Waves in the MELT Experiment on the East
D. W. Forsyth, S. C. Webb, L. M. Dorman, Y. Shen
Science, 280, 1235-1238, 1998. abstract, full text in pdf
November, 1998 - May, 1999: Study of the Structure and Tectonics of
the South Shetland Trench and Bransfield Backarc using Ocean-Bottom Seismographs,
D. A. Wiens, U. Washington; LeRoy Dorman, SIO.
Images of antarctic operations.
|September, 1999 - March, 2000: Imaging the Seismogenic Zone with Geodesy and Seismology: A combined land-ocean transect in Costa Rica, T. H. Dixon, U. Miami; S. Schwartz, UCSC; LeRoy Dorman, SIO; P. Lundgren, JPL; M. Protti, OVISICORI.|
If you have questions about ONR OBS equipment or experiments contact:
LeRoy M. Dorman Scripps Institution of Oceanography, UCSD 9500 Gilman Drive La Jolla, CA 92093-0215 Voice: (619)534-2406 Fax: (619)534-6849 Email: firstname.lastname@example.org
The Chief Engineer of the OBS program is:
Allan W. Sauter Scripps Institution of Oceanography, UCSD 9500 Gilman Drive La Jolla, CA 92093-0215 Voice: (619)534-3435 Fax: (619)534-6849 Email: email@example.com
This document was translated by troff2html v0.21 on March 6, 1995.