Correction: as @culturevolcan pointed out, this is NOT the northeastern rift zone, but the southwestern volcano flank.

Citing: "This picture shows in fact a portion of the initial eruptive fracture cutting the upper South-West flank. Mostly gaz release a a few short lava flows there berfore the magma was drained by the North-East Rift Zone"

Looking carefully to the background you may see the South Pit and two small rounded volcanoes that are located SW of the main caldera.