Abstract:Based on the microgravity method for the repeated surveys, regional time-lapse gravity changes can be detected. Using this method, the monitoring capability for the crustal deep mass changes can be established. In this paper, we propose a novel gravity array observation system, which jointly uses the high-precision absolute gravity, relative gravity, leveling, GNSS instruments and hydrological meters in the optimal observation station, on the basis of earthquake monitoring system. The key advantage of this approach is it isolates the microgravity signal with respect to the different field source depths. Moreover, except for improving signal noise ratio related to the deep source, the parameters of arrayed observation can be adjusted for monitoring special sensitive regions. The results are beneficial to estimating the crustal deep mass variation and help us to understand the earthquake preparation and the cause of geophysical field changes as the direct scientific evidence.
CHEN Shi,GONG Lizhuo,XU Weimin et al. Study on Time-Lapse Microgravity Observation System for Detecting the Crustal Deep Mass Changes[J]. jgg, 2018, 38(1): 1-4.