GRM crustal magnetic anomalies: Separating the Lord Howe Rise and Norfolk Ridge submarine structures

Details GRM crustal magnetic anomalies: Separating the Lord Howe Rise and Norfolk Ridge submarine structures GRM crustal magnetic anomalies: Separating the Lord Howe Rise and Norfolk Ridge submarine structures

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985grm..nasa...37f&link_type=abstract

In NASA, Washington Geopotential Res. Mission (GRM) p 37-40 (SEE N86-12852 03-46)

Physics

Earth Crust, Earth Planetary Structure, Geopotential, Magnetic Anomalies, Ocean Bottom, Satellite Observation, Australia, Continental Shelves, Geomagnetism

Scientific paper

Multiple source bodies often lie within the resolution element of the MAGSAT and POGO data. Small weak sources lying near larger stronger sources will tend to be missed, although they do contribute to the total observed anomaly. Lower elevation magnetic anomaly surveys such as GRM alleviate this problem through the combined effects of significantly greater resolution and stronger signal amplitude. This permits the detection of smaller source bodies, and analysis of their structure and nature. The improvement a GRM will provide is demonstrated in the Lord Howe Rise/Norfolk Ridge area east of Australia, between the Tasman Sea and south Fiji Basin. The submarine features origin have important plate tectonic implications. The Lord Howe Rise (LHR) is a continental fragment broken off from Australia by the opening of the Tasman Sea. It is a wide, shallow structure lying between 160 and 165 deg longitude at 23 to 37 deg S latitude. Seismic refraction data show the LHR crust extending to depths in excess of 20 km.

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