ANALYSIS OF ABNORMAL GROUND TILT AND GROUND STRAIN RESPONSE RATIO(LURR)BEFORE WUSHI MS7.1 EARTHQUAKE
This article is based on the constitutive relationship of rock stress.The tilt and ground strain data in the pre earthquake and surrounding 500 km range of the Wushi MS7.1 earthquake on January 23,2024 were used as the"response variables".The Coulomb stress triggered model's loading unloading response ratio method was used to calculate.The results showed that the Ush cave body strain and other three measurement items all showed pre earthquake LURR anomalies,indica-ting a significant stress accumulation process in the source area medium.At the same time,it also indicates that the tilt and Effective information for earthquake prediction can be extracted from the tidal frequency band of strain.