Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...41...58l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 41, Issue 1, p. 58-65.
Physics
1
Scientific paper
Measurements of the Earth tide using tilt and strainmeter data can be used to infer crustal structure. However, in almost all measurements of crustal motion using shallow tiltmeters and strainmeters, reference is made to the degradation of the data implied to be caused by influence of meteorological parameters on near surface layers. For example, studies by Wood and King and Goulty et al. indicated that a substantial portion of measured crustal motion by shallow tilt and strain data may be attributed to the weather. These studies were limited to data outside the tidal band. However, it is important to determine the effects of weather on these data, within the tidal band, if shallow tiltmeters are to be used to determine crustal structure.
Collocated deep and shallow borehole tiltmeter arrays were operated by The Air Force Geophysics Laboratory in eastern Massachusetts and provided an opportunity to investigate weather effects on shallow tilt. The tiltmeters installed in deep boreholes (100 m) yielded internally consistent M2 amplitudes (2%) and phases (3%) (Cabaniss and McConnell) but the collocated shallow (4 m) borehole tilt array did not produce the same results. Least squares analyses of the shallow tilt data revealed variations of 20% for M2 tidal amplitude compared to the deep data. A multichannel Wiener filter technique was used to investigate the hypothesis that this discrepancy was due to meteorological influence. Results indicated that approximately one-half of the anomalous M2 power was correlated with air and borehole temperatures. It is suggested that the remaining anomalous power may be due to ground deformation caused by the action of groundwater. If this is true, shallow tiltmeters might not be measuring the same deformation as the deep instruments and, therefore, not capable of measuring the Earth tide with the accuracy required to determine crustal structure.
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