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Table 1 Configuration parameters of the 1500-m laser strainmeter

From: Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

Item Value
Coordinates 36°25′48′′N, 137°18′36′′E
Altitude above sea level 358 m
Depth below the surface >200 m
Orientation N60°E, horizontal
Baseline length 1500 m
Diameter of vacuum pipes 400 mm
Designed average pressure in vacuum pipes <0.01 Pa