ABSTRACT
On May 21, 2021, an MS 6.4 earthquake occurred in Yangbi. This paper analyzes and summarizes the digital observation data of geo-resistivity and geoelectric field that is 300 km from the epicenter in recent 6 years, and finds out more reliable earthquake precursor anomalies including the surrounding observation environment, observation system, natural environment, magnetic storm, and other factors. It provides a reference for the observation of earthquake precursors in this same area in the future.
