A magma corridor lies under the town of Grindavík
A volcanic eruption could happen anywhere in that magma corridor
Seismic activity is not extending back to the south west (the area which includes the town of Grindavík)
The town was evacuated early on Saturday morning
Civil Defence declared a Level of Danger
Civil Defence hopes to be able to let Grindavík residents back into their homes for a short time today to collect basic necessities
A plan is reportedly in place to retrieve the many animals left in the town
The Magma Tunnel