A new DT-GEO study published in Communications Earth & Environment has unveiled surprising complexities in the fault structures involved in the 2021 Maduo earthquake in China. Utilizing satellite-based geodetic observations and geological surveys, researchers employed a fully Bayesian approach to estimate the fault geometry of the magnitude 7.4 event.
The analysis revealed that the earthquake’s rupture was not confined to a single, uniform fault plane. Instead, it involved multiple segments with varying orientations and dip angles. Notably, while the western segment of the fault exhibited steep north-dipping angles between 75° and 81°, the eastern segment showed sub-vertical angles ranging from 82° to 87°. Additionally, a southeastern branch displayed a shallower dip of approximately 44°, though further segmentation and aftershock analyses suggest variability between vertical and shallow angles.
These findings challenge traditional models of strike-slip faulting, which often assume more uniform fault geometries. The study underscores the importance of incorporating complex fault structures into seismic hazard assessments, as such intricacies can significantly influence earthquake behavior and associated risks.
The research highlights the need for advanced observational techniques and modeling approaches to better understand the complexities of fault systems, ultimately contributing to more accurate predictions and preparedness strategies for future seismic events.
For more detailed information, the full study can be accessed here.
