Eruptions emitted through elongate cracks at the surface, as opposed to through the vents of volcanic cones, are termed

Fissure eruptions

Explanation:

A fissure vent or eruption fissure is a linear volcanic vent from which lava erupts mostly without explosive activity. The vent is usually not very wide but can be very long stretching for miles. While they do not explode like many volcanic cones do, fissure vents can cause large flood basalts. After some time the eruption builds up spatter cones and may concentrate on one or some of them. Spatter cones are steep-sided hills that consist of welded lava fragments that are called spatter and these cones form around vents.