Loading...
Please wait, while we are loading the content...
Similar Documents
On gravity from sst, geoid from seasat, and plate age and fracture zones in the pacific (Document No: 19850003125)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Marsh, B. D. Marsh, J. G. |
| Copyright Year | 1984 |
| Description | A composite map produced by combining 90 passes of SST data show good agreement with conventional GEM models. The SEASAT altimeter data were deduced and found to agree with both the SST and GEM fields. The maps are dominated (especially in the east) by a pattern of roughly east-west anomalies with a transverse wavelength of about 2000 km. Comparison with regional bathymetric data shows a remarkedly close correlation with plate age. Most anomalies in the east half of the Pacific could be partly caused by regional differences in plate age. The amplitude of these geoid or gravity anomalies caused by age differences should decrease with absolute plate age, and large anomalies (approximately 3 m) over old, smooth sea floor may indicate a further deeper source within or perhaps below the lithosphere. The possible plume size and ascent velocity necessary to supply deep mantle material to the upper mantle without complete thermal equilibration was considered. A plume emanating from a buoyant layer 100 km thick and 10,000 times less viscous than the surrounding mantle should have a diameter of about 400 km and must ascend at about 10 cm/yr to arrive still anomalously hot in the uppermost mantle. |
| File Size | 3057057 |
| Page Count | 40 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850003125 |
| Archival Resource Key | ark:/13960/t6d26rw3b |
| Language | English |
| Publisher Date | 1984-01-01 |
| Access Restriction | Open |
| Subject Keyword | Earth Resources And Remote Sensing Geochronology Satellite-to-satellite Tracking Earth Resources Program Plates Tectonics Lithosphere Pacific Ocean Mapping Ocean Bottom Geoids Geos 3 Satellite Gravity Anomalies Seasat 1 Seamounts Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
