The island has around 30 active volcanic systems, comprising each volcano-tectonic fissure systems and many of them also a central volcano mostly in the form of a stratovolcano, sometimes of a shield volcano with a magma chamber underneath.
Measuring 6,591 feet above sea level in Iceland's Vatnajökull National Park, Bárðarbunga is one of the largest, most active volcanoes on the island. Once a volcano starts erupting, we can track it better than when it's not erupting,
Some of the biggest Volcanos in Icland
Some of the biggest Volcano, location Height in meters
Mount Kilimanjaro (Tanzania)* 5,895
Popocatépetl Volcano (Mexico) 5,426
Mauna Loa (Hawaii, United States)* 4,169
Mount Fuji (Tokyo, Japan) 3,776