These eruptions were explosive and fed by activities in the neighboring volcanic systems.

Under Langjökull there are 2 or more volcanic systems.

"You still think this is part of a larger volcanic system?"

The caldera is the largest volcanic system in North America.

A central volcano and its associated fissure swarm is called a volcanic system.

Of these 30 volcanic systems, the most active/volatile is Grímsvötn.

The craters are a part of a larger volcanic system with the subglacial Grímsvötn as a central volcano.

The Eldgjá canyon is part of the same volcanic system.

These are connected to the same volcanic system as the Nevado de Toluca.

Juriques to the north and Guayaques to the east are separate volcanic systems.