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"The change in strain comes mainly from the rain"^*: Kipapa, Oahu

AMOCO U.S.A., AMOCO BUILDING, 17TH AND BROADWAY, DENVER, COLORADO 80202
HAWAII INSTITUTE OF GEOPHYSICS UNIVERSITY OF HAWAII, 2525 CORREA ROAD, HONOLULU, HAWAII 96822
³ CIRES UNIVERSITY OF COLORADO, BOULDER, COLORADO 80309

Abstract

Strain data from the Benioff type gauge installed in the Kipapa Tunnel on Oahu, Hawaii, are analyzed for the period February 1964 to May 1978. The predominant response is due to temperature variations and rainfall. A rainfallstrain transfer function is obtained using rain water infiltration and groundwater recession models developed by hydrologists. Numerical values obtained range from 0.27 to 0.53 x 10^–7 strain/inch of rain (at a nearby rain gauge).

Subtracting expansion of the quartz rod due to temperature variation, the linear expansion coefficient of in situ tholeiitic basalt of 32 x 10^–7/°C is obtained.

Footnotes

^* Quote from J. C. Rose (15 March 1979).