Stromboli's most recent major eruption was on 13 April 2009. Stromboli stands 926 m above sea level, and over 2,700 m on average above the sea floor. There are three active craters at the peak. A significant geological feature of the volcano is the Sciara del Fuoco, a big horseshoe-shaped depression generated in the last 13,000 years by several collapses on the northwestern side of the cone. Two kilometers to the northeast lies Strombolicchio, the volcanic plug remnant of the original volcano.
Mt. Stromboli has been in almost continuous eruption for the past 2,000 years. A pattern of eruption is maintained in which explosions occur at the summit craters, with mild to moderate eruptions of incandescent volcanic bombs, at intervals ranging from minutes to hours. This Strombolian eruption, as it is known, is also observed at other volcanoes worldwide. Eruptions from the summit craters typically result in a few short, mild, but energetic bursts, ranging up to a few hundred meters in height, containing ash, incandescent lava fragments and stone blocks. Stromboli's activity is almost exclusively explosive, but lava flows do occur at times when volcanic activity is high: an effusive eruption occurred in 2002, the first in 17 years, and again in 2003, 2007, and 2013–14. Volcanic gas emissions from this volcano are measured by a Multi-Component Gas Analyzer System, which detects pre-eruptive degassing of rising magma, improving prediction of volcanic activity.
The two villages San Bartolo and San Vincenzo lie in the northeast while the smaller village Ginostra lies in the southwest. Administratively, they are one of the frazione of Lipari.
In the early 1900s a few thousand people inhabited the island, but after several emigrations the population numbered a few hundred by the mid-1950s.