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Very high-rate GPS for measuring dynamic seismic displacements without aliasing: performance evaluation of the variometric approach

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Abstract

Very high-rate global positioning system (GPS) data has the capacity to quickly resolve seismically related ground displacements, thereby providing great potential for rapidly determining the magnitude and the nature of an earthquake’s rupture process and for providing timely warnings for earthquakes and tsunamis. The GPS variometric approach can measure ground displacements with comparable precision to relative positioning and precise point positioning (PPP) within a short period of time. The variometric approach is based on single-differencing over time of carrier phase observations using only the broadcast ephemeris and a single receiver to estimate velocities, which are then integrated to derive displacements. We evaluate the performance of the variometric approach to measure displacements using 50 Hz GPS data, which were recorded during the 2013 MW 6.6 Lushan earthquake and the 2011 MW 9.0 Tohoku-Oki earthquake. The comparison between 50 and 1 Hz seismic displacements demonstrates that 1 Hz solutions often fail to faithfully manifest the seismic waves containing high-frequency seismic signals due to aliasing, which is common for near-field stations of a moderate-magnitude earthquake. Results indicate that 10–50 Hz sampling GPS sites deployed close to the source or the ruptured fault are needed for measuring dynamic seismic displacements of moderate-magnitude events. Comparisons with post-processed PPP results reveal that the variometric approach can determine seismic displacements with accuracies of 0.3–4.1, 0.5–2.3 and 0.8–6.8 cm in the east, north and up components, respectively. Moreover, the power spectral density analysis demonstrates that high-frequency noises of seismic displacements, derived using the variometric approach, are smaller than those of PPP-derived displacements in these three components.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos. 41631073, 41874038, 41231174 and 41325015). We thank two anonymous reviewers and the Editor Alfred Leick, for their detailed and constructive comments which significantly improved the manuscript.

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Correspondence to Rongxin Fang.

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Shu, Y., Fang, R., Li, M. et al. Very high-rate GPS for measuring dynamic seismic displacements without aliasing: performance evaluation of the variometric approach. GPS Solut 22, 121 (2018). https://doi.org/10.1007/s10291-018-0785-z

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