Influence Of Lithospheric Scale Basement Faults On Seismicity In The Himalayan Orogenic System

The Himalayan system is the result of a continental collision that occurred approximately 55 million years ago between Indian and Asian tectonic plates1,2. resulted in underthrust crust beneath Asia, deformed crustal wedge3,4. plate records complex pre-Himalayan geological history includes several basement faults reach depths 70 kilometres are oriented at high angle to front5. These bound topographic highs interpreted limit rupture earthquakes6. Recent research suggests control distribution magnitude seismicity along Himalaya7. 
 serves as prototype for novel three-dimensional numerical modelling understand if how inherited structures influence orogenic settings. Models generated using Coreform Cubit meshing software run on supercomputer platform hosted University Toronto. initial model contains three blocks: crust, wedge, all cut by lithospheric scale fault. 2015 7.9 MW Gorkha earthquake simulated, slip basal detachment. Seismograms, shear wave potential, compressional potential movies created within systems. Understanding these regionally significant densely populated regions northern India Nepal utmost societal importance. References 1. Najman, Y., et al., (2010). Timing India‐Asia collision: Geological, biostratigraphic, palaeomagnetic constraints. Journal Geophysical Research: Solid Earth, 115. 2. Hodges, K. V. (2000). Tectonics Himalaya southern Tibet from two perspectives. Geological Society America Bulletin, 112(3), 324-350. 3. Godin, L., (2019). Influence evolution Orogen, Crustal Architecture Evolution Himalayan-Karakoram-Tibet R. Sharma, I. M. Villa, S. Kumar, Editors, London Special Publication, 481, 251-276. 4. Chung, S.-L. al. (2005). Tibetan inferred spatial temporal variations post-collisional magmatism. Earth-Science Reviews 68, 173–196. 5. & Harris, L. B. (2014). Tracking cross-strike discontinuities orogen gravity data – relationship upper faults. International, 198, 198-215. 6. Gahalaut, K., Kundu, (2012). Possible subducting ridges arc ruptures great major earthquakes. Gondwana Research, 21(4), 1080-1088. 7. V, Arora, Segmentation Arc due structural heterogeneities under-thrusting overriding wedge. Episodes International Geoscience, 35(4), 493-500.