Measurement and interpretation of tidal tilts in a small array
Measurement and interpretation of tidal tilts in a small array
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小阵列潮汐倾斜的测量和解释
DOI：
10.1029/94jb02773
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发表时间：
1995
影响因子：
--
通讯作者：
J. Levine
中科院分区：
文献类型：
--
作者：
M. Kohl;J. Levine
由材料特性变化引起的应变引起的倾斜可能会在材料不连续性附近的倾斜场中产生较大的扰动。自 1987 年以来一直在南加州 Piiion Flat 地球物理观测站运行的密集钻孔倾斜仪阵列的数据证明了这一点。该阵列由位于 24、36 和 120 m 深度的三个钻孔倾斜仪组成。倾斜计的灵敏度为几个纳弧度。潮汐测量显示钻孔之间的差异高达 50%。最大百分比差异出现在半日波段，其中 36 米钻孔中测量的倾斜场在 M2 频率下相差 -10 nrad。这种差异已被建模为由风化层引起的应变引起的倾斜。
Strain-induced tilts caused by variations in material properties can produce large perturbations in the tilt field near a material discontinuity. This is evidenced in data from a closely spaced array of borehole tiltmeters that has been operating at Piiion Flat Geophysical Observatory in southern California since 1987. The array is composed of three borehole tiltmeters located at depths of 24, 36, and 120 m. The tiltmeters have a sensitivity of a few nanoradians. Tidal measurements show differences between the boreholes of up to 50%. The largest percent difference occurs in the semidiurnal band where the tilt field measured in the 36-m borehole differs by -10 nrad at the M2 frequency. This difference has been modeled as a strain-induced tilt caused by the weathering layer.