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Six‐Degree‐of‐Freedom Broadband Seismogeodesy by Combining Collocated High‐Rate GNSS, Accelerometers, and Gyroscopes
Author(s) -
Geng Jianghui,
Wen Qiang,
Chen Qijin,
Chang Hua
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl081398
Subject(s) - accelerometer , gyroscope , gnss applications , broadband , geodesy , computer science , remote sensing , satellite system , satellite , baseline (sea) , global positioning system , geology , acoustics , aerospace engineering , physics , telecommunications , engineering , oceanography , operating system
Combining collocated high‐rate Global Navigation Satellite Systems (GNSS) and accelerometers produces broadband seismogeodetic displacements. However, accelerometer data must be heavily downweighted due to their baseline errors originating primarily in instrument rotations, and therefore their contribution to seismogeodetic displacements is seriously underestimated. We further introduced a gyroscope into this classic seismogeodesy to mitigate baseline errors and formulated advanced six‐degree‐of‐freedom (6‐DOF) seismogeodesy without undervaluing accelerometer data. A shake table holding one GNSS antenna, four accelerometers, and one gyroscope was used to simulate waveforms from the 2010 Mw 7.2 El Mayor‐Cucapah earthquake. We found that the displacements derived from the 6‐DOF seismogeodesy were up to 68% more accurate than those from the classic seismogeodesy over 0.04–0.4 Hz. Moreover, broadband rotations containing the permanent components were also generated, which were unachievable by integrating gyroscope data. We believe that the 6‐DOF seismogeodesy is capable of improving both source rupture studies of large earthquakes and high‐rise monitoring under strong seismic waves.