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The effect of error in theoretical Earth tide on calibration of borehole strainmeters

Geophysical Research Letters

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DOI: 10.1029/2010GL044454

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Abstract

Since the installation of borehole strainmeters into the ground locally distorts the strain in the rock, these strainmeters require calibration from a known source which typically is the Earth tide. Consequently, the accuracy of the observed strain changes from borehole strainmeters depends upon the calibration derived from modeling the Earth tide. Previous work from the mid-1970s, which is replicated here, demonstrate that the theoretical tide can differ by 30% from the tide observed at surface-mounted, long-baseline strainmeters. In spite of possible inaccurate tidal models, many of the 74 borehole strainmeters installed since 2005 can be “calibrated”. However, inaccurate tidal models affect the amplitude and phase of observed transient strain changes which needs to be considered along with the precision of the data from the inherent drift of these borehole instruments. In particular, the error from inaccurate tidal model dominates the error budget in the observation of impulsive, sub-daily, strain-transients.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The effect of error in theoretical Earth tide on calibration of borehole strainmeters
Series title:
Geophysical Research Letters
DOI:
10.1029/2010GL044454
Volume
37
Issue:
21
Year Published:
2010
Language:
English
Publisher:
AGU
Publisher location:
Washington, D.C.
Contributing office(s):
Earthquake Science Center
Description:
L21303
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters