Leveling Surveys around the Odawara Tiltmeter Borehole

The Odawara tiltmeter borehole is located near the Kozu-Matsuda fault, which is the northwestern extension of the Sagami trough. In order to check the tiltmeter data, short-range leveling surveys have been conducted once a year since 1977. The tiltmetry resulted in A N 60°E tilting of about 1 second of arc during 1977-1978, while the leveling resulted in A N 50°E tilting of 0.7 second of arc during the same period