Earthquakes :
There had been a lot of earthquakes in BD in the last decade, which mysteriously stopped after the large Nepal quake.
Indicating that the smaller ones most likely where foreshocks before the large Nepal one.
Reminder that the whole country of BD had been turning anti clockwise for the last two decades, and the movement is now about a foot. And this builds up stress, which had to be released somehow some year with a mega quake.
The last mega quake in this region occurred about 200 years ago and created the large rivers that we are familiar with.