Active backstop faults in the Mentawai region of Sumatra, Indonesia, revealed by teleseismic broadband waveform modeling

- Model broadband waveform to refine “backthrust” earthquakes in the Mentawai.
- The relocated earthquakes delineate a landward-dipping backstop fault.
- Model 1: Reactivation of the pre-existing fault in the forearc crust.
- Model 2: Unsticking of accretionary wedge and forearc crust (backstop fault).
- Our approach can be generalized to study global earthquakes.