It then gradually declined and became intermittent in the last few days. Small tremor bursts were recorded in the next 3 hours but no activity has been detected after 14 h. More detailed information on this eruption can be found here This eruption of Grimsvotn confirms the notion expressed after the 1996 Gjalp eruption, that this central area of the Iceland hotspot is entering an episode of increased magmatic activity following an unusually long period of relative quiescence, 1938-1996. The eruption vents are on a short fissure located on the southern caldera fault, similar to the 1983 and 1934 eruptions. A continuous eruption plume extends to elevation of 10 km.
Westerly wind deflects the plume to the east causing tephra fallout on the surface of the glacier.
Tephra has not yet been detected outside the glacier. The eruption was preceded by a mild increase in seismic activity during the last few weeks. L'eruzione era al massimo vigore nei primi due giorni, per poi decadere e diventare intermittente negli ultimi giorni. 1983 e del 1934.