NCREE Analyzes Fault Geometry Uncertainty and Dip Settings for Chihshang Fault

Researchers at Taiwan's National Center for Research on Earthquake Engineering analyzed fault geometry settings in probabilistic seismic hazard analysis (PSHA) using survey data from the Chihshang fault. The study compared dip angle statistics with 2D geometric superposition profiles, showing that 2D superposition more intuitively depicts multi-dip geometry and transitional attitudes from shallow to deep layers.

Key takeaways

• Setting shallow dip angles of the Chihshang fault to 45°, 60°, and 75° with weights 0.2/0.6/0.2 matches analytical results.
• The 2D geometric superposition profile displays multi-dip geometry more intuitively than statistical methods, assisting analysis of fault attitudes and turning depths.