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Earth, Planets and Space

Table 1 Calibration table for both stress and strain of the meter

From: Development of a borehole stress meter for studying earthquake predictions and rock mechanics, and stress seismograms of the 2011 Tohoku earthquake (M 9.0)

Stress (MPa) = −A × output (V) + B

 

HSR1

HSR2

HSR3

HSR4

VSRH

VSRL

A

0.575

0.447

0.512

0.514

0.253

4.06

B

12.9

12.9

12.7

12.9

12.9

3.51

Strain = A × output (V) × 10−5 + B × 10−7

 

HSR1

HSR2

HSR3

HSR4

VSRH

VSRL

A

2.94

2.73

2.77

2.80

3.29

32.2

B

1.51

−6.4

10.1

10.3

1.41

66.1

  1. The meters equipped in multi-component borehole instrument are installed in the Toshinomori (TOS) station at a depth of 512 m. HSR1 to HSR4: horizontal components. VSRH: vertical component with high sensitivity, VSRL: vertical component with low sensitivity.
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