Eruption of crater 1 in moonlight. October 1986, from approximately 700m.a.s.l. (regular summit route). This image was taken during full moon in October 1986. After the eruption had terminated, the camera shutter was kept open for several minutes in order to capture the weak sky light and some of the landscape. During this time crater 3 also erupted (right background). However, the two eruptions did not occur simultaneously. The small bright lines in the sky are stars which trailed during the exposure time as a result of the Earth's rotation.