Affiliation:
1. 1State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China
2. 2State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China
3. 3Department of Earth and Planetary Science and Berkeley Seismology Lab, University of California, Berkeley, California, U.S.A.
Abstract
Abstract
Long-term fault growth involves the evolution of fault zone architecture, structural maturity, and physical properties. Accurate characterization of these features is essential for improving the understanding of fault mechanics and earthquake hazards. Here, we integrate relocated aftershocks (Wang, Fang, et al., 2021), optical satellite imagery (Li et al., 2023), and field measurements (Yuan et al., 2022) to study the aftershock zone thickness and decay, coseismic surface strain, off-fault deformation, and the buried shallow fault slip of the 2021 Mw 7.4 Maduo earthquake, which occurred on an immature fault based on the total cumulative displacement of 4–5 km. We comprehensively characterize the deep, shallow, and surface fault zone deformation and link the observed variations of kinematic features to the structural maturity of the fault zone structure. Our study provides a macroscopic description of the fault zone deformation and their patterns across earthquake ruptures for the Maduo earthquake, and may have broader implications for the continental immature faults.
Publisher
Seismological Society of America (SSA)