Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ssde5s&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 19, pp. SDE 5-1, CiteID 1990, DOI 10.1029/2003GL017995
Physics
2
Seismology: Instruments And Techniques, Tectonophysics: Rheology-Crust And Lithosphere, Tectonophysics: Instruments And Techniques
Scientific paper
Borehole dilatometers are emplaced in porous fluid saturated rock. Pore-fluid flow induces strain, however there is no fluid exchange with the dilatometer. Thus, the strainmeter response is the same as the strain in the rock only when the rock remains undrained. Otherwise the instrumental strain Δinst is given by Δinst = C1 (Δ∞ - C2 p∞), where Δ∞ and p∞ are strain and pore pressure far from the borehole, and C1 and C2 depend on poroelastic rock properties. Postseismic strain in the rock is expected to increase as the induced pore pressure gradients relax. However, a dilatometer ~3 km from a Mw 6.5 earthquake in south Iceland shows a postseismic strain change opposite in sign to the coseismic response. The theory developed here for a homogeneous, isotropic medium can only partly explain this discrepancy. Fracture dominated poroelastic response may yield an improved fit to the data.
Ágústsson Kristján
Jónsson Sigurjón
Segall Paul
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