The magma chamber under mount Hekla is almost full now, more than last time when she erupted says Páll Einarsson, professor in geophysics at the University of Iceland. Hekla is the most active volcano in Iceland and usually erupts with very short notice.
Hekla last erupted in the year 2000, just 79 minutes after the first quake. The time has always been shorter than that, but Hekla has erupted over 20 times in the last 1000 years.
The last large eruption in Hekla volcano was in 1947. The volcano is monitored closely, now as before, but due to her short notice before eruption, travelers are encouraged not to walk on or around Hekla while she is in this state.
Gateway to hell
Hekla is a stratovolcano in the south of Iceland with a height of 1,491 metres (4,892 ft). Hekla is one of Iceland's most active volcanoes; over 20 eruptions have occurred in and around the volcano since 874. During the Middle Ages, Europeans called the volcano the "Gateway to Hell".
Hekla is part of a volcanic ridge, 40 kilometres (25 mi) long. The most active part of this ridge, a fissure about 5.5 km (3.4 mi) long named Heklugjá, is considered to be the volcano Hekla proper. Hekla looks rather like an overturned boat, with its keel being a series of craters, two of which are generally the most active.
The volcano's frequent large eruptions have covered much of Iceland with tephra and these layers can be used to date eruptions of Iceland's other volcanos. 10% of the tephra created in Iceland in the last thousand years has come from Hekla, amounting to 5 km3. The volcano has produced one of the largest volumes of lava of any in the world in the last millennium, around 8 km3.
Warning Signs put up around Hekla
The Icelandic authorities and police are planning to put up warning signs in the area around Hekla about possible eruption. The signs will be in both Icelandic and English. Also, in case of an eruption, every phone in the vicinity of Hekla will receive a text/SMS with a warning - also in both Icelandic and English.