Deterministic Tsunami Hazard Map for India

The present work aims to ascertain the deterministic tsunami hazard map for maximum wave height along the Indian coastline due to subduction events in the Sumatra region. The region between 15°S–30°N lat. and 50°E–115°N long. was modelled in using Geoclaw, which discretizes and solves the shallow-water wave equation using adaptive finite volume algorithm. The developed model was suitably validated for the available tidal gauge and altimeter data for the 2004 M_w 9.12 Sumatra earthquake with input source characteristics from the SRCMOD data. Further, a sensitivity study based on slip variability and location was conducted which revealed that near-field stations were highly sensitive at all locations while far-field stations were more sensitive towards source locations. Furthermore, 25 non-Gaussian slip fields were generated for the maximum possible event (M_w 9.12) for the region and placed suitably along the active Sumatra subduction region. Then the wave heights from all the simulations were assembled to determine the deterministic tsunami hazard values with respect to maximum wave heights for the coastal regions of India and adjoining regions. The results will find application in the design of structures along the coastline of the study region.