Figure F10. Pressure transients observed at CORKed ODP Hole 1027C revealing strain associated with seismogenic slip at the time of two regional earthquakes in 1996 and 1999 (Mw = 6.3 and 4.6, respectively). The sense of strain (expansional in 1996, contractional in 1999) is in each case consistent with that predicted on the basis of the earthquake moment tensors. The CORK observatory in this hole is completed in highly permeable oceanic crust; lateral fluid flow beneath the extensive low permeability sediment cover causes eventual drainage of the anomalous pressure. Transients associated with these events were observed at the other CORKed boreholes in the area as well (Davis et al., 2001; Kastner et al., 2006).
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