Abstract
Anelastic strain recovery (ASR) was measured on 8 cores obtained from the bottom of a 1, 000m depth borehole, drilled at Inagawa town in Hyogo prefecture.The largest amount of ASR was observed on a 967m core of cataclasite, which was obtained from a shear zone. ASR up to 150 microstrain was observed on cores of sandy shale obtained from the depthes of 980-998m. The amount of ASR of individual core differd from those of others, although cores were obtained in only 3m apart from a same formation.The direction of principal strain on a horizontal plane was estimated on 3 cores (967m, 992m, 995m). The direction of 967m and 992m cores, on which large amount of ASR was observed, coincides with that of the horizontal maxium stress obtained from a hydrofracturing test at the depth of 946m. The direction of 995m core, on which small amount of ASR was observed, differs from that of hydrofracturing test, but coincides with the old tectonic stress direction estimated from the syncline around the borehole.
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