New Approaches to In Situ Calibration for Seafloor Geodetic Measurements
New Approaches to In Situ Calibration for Seafloor Geodetic Measurements
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海底大地测量现场校准的新方法
DOI：
10.1109/oceanskobe.2018.8559178
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
J. Paros
中科院分区：
文献类型：
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作者：
W. Wilcock;D. Manalang;M. Harrington;E. Fredrickson;G. Cram;J. Tilley;J. Burnett;Derek Martin;Taro Kobayashi;J. Paros
海底大地测量具有挑战性，但对于了解沿俯冲带的地震和海啸的危害非常重要。提出了两种基于谐振石英晶体传感器获得自校准测量值的海底大地测量方法。校准压力观测的a -0- a方法利用仪器外壳的内部压力作为校准传感器漂移的参考压力。在900米深处进行的为期8个月的海底测试表明，该方法将两个压力传感器之间的相对漂移减小到小于1毫米。旋转（或翻转）倾斜仪通过将三轴加速度计的水平通道旋转到重力加速度用作参考加速度的垂直方向来校准它们的加速度。实验室测试非常有希望，并计划在海底和大地观测站部署。
Seafloor geodesy is challenging but important for understanding the hazards from earthquakes and tsunamis along subduction zones. Two methods of seafloor geodesy are presented based on obtaining self-calibrated measurements with resonant quartz crystal technology sensors. The A-0-A method for calibrating pressure observations utilizes the internal pressure of the instrument housing as a reference pressure to calibrate sensor drift. An 8-month seafloor test at a depth of 900 m, shows the method has reduced the relative drift between two pressure sensors to <1 mm. The rotating (or flipping) tiltmeter calibrates the accelerations of the horizontal channels of a triaxial accelerometer by rotating them into the vertical where the acceleration of gravity is used as a reference acceleration. Laboratory tests are very promising and deployments are planned on the seafloor and at a geodetic observatory.