降雨及び湧水量変化の地殻ひずみの観測に及ぼす影響について -岩倉観測室の場合-

Abstract

For the purpose of investigating effects of amounts of rainfall and discharged water upon theground-strain, a discharge-meter was installed in the observation tunnel at Iwakura in 1978. As aresult, strain changes of the E-1 extensometer which is orientated across the tunnel are closely relatedwith variation of discharged water in the tunnel. And the increment of discharged water is causedby rainfall. E-2 and E-3 extensometers which are orientated along and nearly along the tunnelare not so much affected by rainfall. The maximum contraction of the E-1 component appearswith delay of 3 days from the peak of the increment of discharged water.