For the first time in two years the Iceland Meteorological Office has raised the aviation warning code for Mount Hekla from green to yellow due to unusual seismic activity around the volcano. Seven minor seismic events have occurred since 10th March and these are considered abnormal around Hekla. Hekla has erupted 20 times since 874 CE and erupted last in 2000 and previously – in recent times – in 1991, 1981,1980, 1970 and 1947.
The Icelandic Meteorological Officehas changed the aviation colour-code of Hekla volcano from green to yellow, signifying elevated unrest above a known background level during the last weeks. The Icelandic Civil Defence together with the Police in Hvolsvöllur have declared a level of uncertainty for Hekla. The change from green to yellow is a precautionary step due to increased earthquake activity. To date, there are no observable signs that an eruption of Hekla is imminent.
location of iceland volcanos (from decadevolcano.net)
The k2p blog 