Fluid flow triggered migration of events in the 1989 Dobi earthquake sequence of Central Afar

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Abstract

During the August 1989 sequence of earthquakes beneath the Dobi graben in Central Afar, principal events (including 10 shocks with ML≥5.5) propagated ∼50 km north-westwards in ∼-50 h. 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 ∼N115°E nearly parallel to the graben axis. With a value D̄xx ∼2m2/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 (∼10-8 m2) 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. Copyright 1997 by the American Geophysical Union.

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Noir, J., Jacques, E., Békri, S., Adler, P. M., Tapponnier, P., & King, G. C. P. (1997). Fluid flow triggered migration of events in the 1989 Dobi earthquake sequence of Central Afar. Geophysical Research Letters, 24(18), 2335–2338. https://doi.org/10.1029/97GL02182

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