The latest aftershock had a magnitude of 5.9 or 6.2, according to monitors. It brought down some buildings.
Rescue workers are still digging through rubble and trying to get aid to survivors of the earlier, larger quake.
The Red Cross says that incident, which was magnitude 6.9 and killed at least 131, was "exceptionally destructive".
Some villages had "completely collapsed", said a Red Cross official in Lombok, Christopher Rassi.