largest earthquake not in a subduction zone Whats the largest earthquake since 1900 that was not in a subduction zone (not a megathrust).

Wikipedia says that Since 1900, all earthquakes of magnitude 9.0 or greater have been megathrust earthquakes. No other type of known terrestrial source of tectonic activity has produced earthquakes of this scale.
08/15/1950 Assam, tibet, 8.9 magnitude. according to the USGS, https://earthquake.usgs.gov/earthquakes/browse/largest-world.php

Note you are talking about a very small window of time there are only 5 earthquakes of 9.0 or greater within that time frame.