According to the Tunnel Seismic Prediction (TSP) - 303 Plus report, prepared by Amberg Tech AG, a tunnelling surveying business in January 2020, the fault zone was located between 13.88 km (13,882 ...

Officials said there were more fault zones and softer aggregate formations, such as the one that caused the collapse. Unless these locations are studied fully, proceeding with the work was not ...

A report commissioned by Jaiprakash Associates Ltd—the company awarded the tunneling contract in 2005—had flagged a "fault zone" in the tunnel as early as January 2020, as reported by The ...

The asperities do not significantly control fault movement during the unlocking and failure of the healed faults, but only following the peak axial stress as the faults slide and damage zones develop.