Other
Scientific paper
Jan 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974saosr.358.....m&link_type=abstract
SAO Special Report #358 (1974)
Other
4
Scientific paper
Remeasurement of the Adama, Lake Langana, and Arba Minch (Lake Margherita) geodimeter networks in 1973 has enabled Mohr's interpretation concerning possible surface ground deformation in the Ethiopian rift to be considerably developed. Extension appears to have occurred across the Mojjo-Adama horst at a rate of about 1 cm yr-1. The opposing rims of the Adama graben have not moved significantly relative to one another (between 1969 and 1973), but stations on the sliced graben floor show possible movement with a large rift-trend component. In the Wolenchiti quadrilateral, significant movement of station RABBIT is confirmed, but the radical change of vector (that of 1970-1971 to that of 1971-1973) casts doubt on a tectonic cause and seems to indicate that stations on steep hillslopes are liable to be unstable. South of the quadrilateral and east of the Adama graben, alternating rift-trend zones of extension and shortening appear to coexist. In the Lake Langana network, significant movements of the order of 0.5 cm yr-1 are directed perpendicular to the rift-floor faulting. No significant line-length changes have occurred in the Arba Minch network, despite an earthquake there in January 1973. A modification of the ground-radiation correction, applied to the atmospheric density correction, has improved the precision of the Ethiopian line-length means to the range +/- 4.9 to +/- 6.1 mm. The reference for the Ethiopian lines has been transferred from the 1970 and 1971 surveys to the 1969 survey, as the latter is now shown to be the more accurate.
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