Effect of error in theoretical Earth tide on calibration of borehole strainmeters

摘要: [1] Since the installation of borehole strainmeters into ground locally distorts strain in rock, these require calibration from a known source which typically is Earth tide. Consequently, accuracy observed changes depends upon derived modeling Previous work mid-1970s, replicated here, demonstrate that theoretical tide can differ by 30% at surface-mounted, long-baseline strainmeters. In spite possible inaccurate tidal models, many 74 installed since 2005 be “calibrated”. However, models affect amplitude and phase transient needs to considered along with precision data inherent drift instruments. particular, error model dominates budget observation impulsive, sub-daily, strain-transients.