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Earth, Planets and Space

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

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