Other
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2335n&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 18, p. 2335-2338
Other
49
Physical Properties Of Rocks: Fracture And Flow, Seismology: Oceanic Crust
Scientific paper
During the August 1989 sequence of earthquakes beneath the Dobi graben in Central Afar, principal events (including 10 shocks with ML>=5.5) propagated -50km northwestwards in -50h. The sequence is analyzed in terms of triggering by propagation of a critical pore pressure wave in a compressible fluid through a fractured medium. The macroscopic fluid diffusion tensor D in the crust beneath the graben is estimated. Its principal eigenvector strikes ~N155°E nearly parallel to the graben axis. With a value Dxx~2km2/min, it is about 10 times larger than the other two, consistent with fissure anisotropy in the graben. The order of magnitude of the permeability (~10-8m2) is compatible with characteristic fissure widths ranging from 1 mm to 3 cm. Estimating such parameters in other extensional regions might help to understand better the temporal evolution of seismic swarms.
Adler Pierre M.
Békri S.
Jacques Eric
Noir Jérôme
P. King Geoffrey C.
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