Gravity changes over the East-Izu uplift, Japan.

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Abstract
Precise gravity surveys have been repeated twenty times at 36 stations on the Izu Peninsula since December 1976. A free-air gradient gravity decrease occurred concurrently with a dome-like uplift centering at Hiekawa Pass, while a Bouguer gradient gravity increase was observed in association with a coseismic crustal subsidence accompanied by the 1978 Izu-Oshima-Kinkai earthquake. Growth and migration of the coswarm uplift around Cape Kawanazaki were successfully detected as temporal gravity changes during the period from 1978 to 1980. At a benchmark located nearby a borehole volume-strainmeter station, we found an interesting fact that gravity changes are proportional to changes in volumetric strain with a rate of 1.4×10-6/μgal.

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