Comparative Analysis of Seismic Observation Capabilities between Quantum Absolute Gravimeter and gPhone RG at the Same Site
Liu Zhong-Tao, Liu Dai-qin*, Ren Jia, Zhao Zhi-Yuan
1. Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, Xingtai 055350, China
2. Zhangjiakou earthquake monitoring center station, Zhangjiakou 075000, China
3. Seismological Bureau of Xinjiang Uygur Autonomous Region, Urumqi 830011, China
4. Hebei Provincial Seismological Bureau, Shijiazhuang 050022, China
Abstract：
This study compares the performance of a quantum absolute gravimeter (QAG) and a gPhone relative gravimeter (RG) installed at the same site in Zhangjiakou. The comparison focuses on their capabilities in recording seismic waveforms and detecting Earth's free oscillation signals following the Myanmar Ms7.9 earthquake. Both instruments exhibit unique advantages in their observation capabilities. The QAG demonstrates high sensitivity to the initial arrival of seismic waves, producing distinct peak waveforms, while the RG maintains a stable waveform suitable for analyzing seismic wave propagation and energy dissipation mechanisms. In terms of time-frequency analysis, the QAG excels in surface wave frequency resolution but experiences rapid signal attenuation. Conversely, the RG offers superior stability in sustained gravity disturbances with slower signal decay. Regarding spherical Earth free oscillation signals, the RG generally detects more pronounced signals with minimal deviation from the Preliminary Reference Earth Model (PREM) theoretical values. However, the QAG exhibits high sensitivity and a wide dynamic range in higher frequency bands. Combining data from both instruments provides comprehensive seismic monitoring data, facilitating a deeper understanding of Earth's internal mass distribution and dynamic processes.
. Comparative Analysis of Seismic Observation Capabilities between Quantum Absolute Gravimeter and gPhone RG at the Same Site[J]. APPLIED GEOPHYSICS, 2025, 22(4): 1169-1181.
2025, Vol. 22 
