Co-seismic displacements are essential to rapid earthquake magnitude determination for earthquake early warning (EEW). Nowadays, the seismogeodesy technology combining accelerometer and GNSS can better monitor seismic displacement in real time. Our team has developed a new in-situ real-time seismogeodetic instrument SMAG2000 (Strong Motion Accelerographs with GNSS 2000) for real-time seismic monitoring. The instrument is composed of a GNSS receiver board, a high-precision accelerometer, and an embedded development board for real-time processing. SMAG2000 can realize the in-situ real-time synchronous data acquisition and fusion positioning processing.
The instrument has the following characteristics:
1. The instrument integrates GNSS and accelerometer data, and it has no range limit, so it can obtain permanent displacement.
2. According to the shaking table experiments, the standard deviation of the residual error between the instrument measurement results and the reference value is better than 0.4cm, and the correlation coefficient is greater than 0.9 for sine-wave signals with different frequencies and simulated seismic-wave signals.
3. The core components and accessories used by the instrument are all made in China, and the cost is controllable. It can be deployed in China's seismic monitoring network to realize the combination of the seismic network and the geodetic network.
 Xin, S., Geng, J., Zeng, R., Zhang, Q., Ortega-Culaciati, F., & Wang, T. (2021). In-situ real-time seismogeodesy by integrating multi-GNSS and accelerometers. Measurement, 109453.
 ZENG Ran, GENG Jianghui, XIN Shaoming, et al. SMAG2000: Integrated GNSS strong seismograph and analysis of its seismic monitoring performance [J].Geomatics and Information Science of Wuhan University, 2020, DOI:10.13203/j.whugis20200426
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