Abstract：In order to explore the variation characteristics of b-value before and after the Menyuan MS6.9 earthquake in Qinghai, we select a time scale of 10 years before the earthquake for time scanning. It’s found that the b-value in the focal area decreases to a certain extent before the earthquake, and then shows a small rebound after the earthquake, which may be related to the post-seismic stress release. Using the catalogs of small earthquakes from Qinghai seismic network since 2000, the spatial scanning of b-value and calculation of Δb-value based on the minimum magnitude of completeness show that the Menyuan MS6.9 earthquake occurred at the edge of low b-value region, and the Δb-value in the focal area one year before the earthquake did not change significantly, indicating that the stress accumulation of the Menyuan earthquake mainly took place before 2021. The b-value change of aftershock sequence in early stage can provide some reference for the location prediction of later aftershocks.
GUO Yingxia,ZHU Yimin,YU Teng et al. Research on Spatio-Temporal Characteristics of b-Value before and after the 2022 Menyuan MS6.9 Earthquake[J]. jgg, 2023, 43(11): 1155-1161.
