Nepal is used to quakes – this is one of the most seismically active regions in the world. You only have to look at the Himalayas to understand that.
The mountains are being built as a consequence of the Indian tectonic plate driving under Central Asia (the Eurasian tectonic plate). These two great slabs of the Earth's crust are converging at a relative rate of about 4-5cm (two inches) a year.