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Fault structures illuminated by the Aftershocks of the 2015 Mw 7.8 Gorkha Earthquake in Nepal

As a result of the 2015 Mw 7.8 Gorkha earthquake, more than 9,000 people were killed from a combination of infrastructure failure and triggered landslides. The earthquake produced 8m of peak co-seismic slip as the fault ruptured 130 km east

under densely populated cities, such as Kathmandu. To understand earthquake dynamics in this part of Himalaya and better prepare for the next destructive event, it is imperative to study the earthquake activity in detail to improve our understanding of the source and structural complexities. In rapid response to the Gorkha Event, multiple institutions developed and deployed a dense, 45- station, seismic network ("NAMASTE") from June 2015 to May 2016. Composed of a mix of broadband, short-period, and strong motion sensors, with an average spacing of ~20 km, NAMASTE captured the dynamic sequence of aftershock behaviour by blanketing the 27, 650 km2 rupture area.

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