Simulation analysis of strong earthquake magnitude in Bayankala block based on gravity observation

Abstract

Based on the continuous gravity observation data of Wujiahe seismic station in Inner Mongolia, the waveform correlation between PET relative gravimeter and JCZ-1 very broadband seismometer and the physical characteristics of coseismic deformation are analyzed using the high sampling rate of PET gravimeter. By simulating and analyzing the correlation between the coseismic P-wave, S-wave and surface wave with epicentral distance and magnitude of six strong earthquakes with M≥7 occurred around Bayankala block recorded by PET relative gravimeter at Wujiahe seismic station, the general magnitude model, in-situ stress wave model and S-wave P-wave amplitude ratio model are obtained. By calculating the error and correlation coefficient R value between the theoretical magnitude and the actual magnitude of the three models, the standard error between the theoretical magnitude and the measured magnitude is 0.04, and the R value is 0.99, which verifies the reliability of the model. The error and R value of theoretical magnitude and actual magnitude are compared and analyzed to reveal the physical mechanism of geodynamic characteristics contained in coseismic deformation waveform.

Keywords

• gravity observation
• bayankala block
• strong earthquake magnitude
• coseismic deformation
• simulation analysis