Image Collection | Types and Features | Maars
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Maar volcanoes are a result of phreatomagmatic eruptions and contain a crater that cuts into the ground surface, a diatreme containing debris from explosions, and a tephra ring around the crater formed by pyroclastic surge deposits, tephra, and ballistic projectiles. Maar craters usually span tens to around 200 m deep and diameters range from a few to several hundred kilometers. They may contain overlapping craters to form one depression. Below the crater is the diatreme (the volcanic pipe), which can extend below the surface for hundreds of meters to over 1 km, narrowing downwards. Hazards include ballistic ejecta, pyroclastic surge, and tephra.