Spatial and temporal variations of b-values along the East African rift system and the southern Red Sea

Details Spatial and temporal variations of b-values along the East African rift system and the southern Red Sea Spatial and temporal variations of b-values along the East African rift system and the southern Red Sea

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...83..249k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 83, Issue 3-4, p. 249-264.

Physics

8

Scientific paper

Spatial and temporal variation of b-values for the East African rift system and the southern Red Sea is studied. In general, average b-values obtained for the whole East African rift system range from 0.5 to 1.5. Mapping of b-value shows that relatively low average b-values (0.5-0.8) are observed in certain segments of the southern Red Sea, Afar Depression and north of the Western rift. If experimental laboratory works are correct then, this observation may imply that during the time interval studied here (1963-1990), parts of the northern East African rift system have been experiencing relatively high stress levels when compared with the southern part of the region. Plots of temporal variation of b-values for different segments of the rift show different behavior. These observations suggest that different rift segments are under different stress conditions which in turn may reflect the status of the ongoing rifting processes in each segment. In southern Africa, a sudden significant increase in b-value followed by a gradual decrease is observed prior to the occurrence of an intermediate-size earthquake with normal faulting mechanism. A thorough investigation of the temporal change of b-values in the southern Red Sea prior and after the occurrence of an intermediate-size earthquake with a strike-slip mechanism could not reveal such a precursory phenomena. Observations are consistent with those made by other researchers in other regions.

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