Loose_Grip/Pete's photos with the keyword: volcano

Mount Sibayak is a fairly dormant volcano near Berastagi south of Medan. It is more than 100 years since it last erupted - very recently in geological time - but the Barisan Mountains are definitely still active. Mt Sinabung a few kilometres from here did erupt in 2010.

We were staying in the Mobil guesthouse in Puncak in the mountains south of Jakarta. This was the view looking west towards Mount Pangrango (3,019 m/ 9,905 ft) a dormant volcanic peak, one of many on the Sunda Arc.

We climbed Sibayak volcano a couple of times when we lived in Medan. This this was the first ascent and we met this group of kids on their way down. A photo was called for. The walk starts in rice padi fields but climbs quite steeply through forest and then onto open rock. The crest is at 2,212 m (7,257 ft) and in the clouds it gets chilly when you're wearing shorts!

From one volcano to another! We are on on Mount Sibayak (Indonesian: Gunung Sibayak) an active Pleistocene-to-Holocene stratovolcano peaking at 2,181 m (7,156 ft). The other volcano is Mount Sinabung, about 15km to the southwest, that in 2010 erupted after a 400-year-long hiatus, a blink of an eye in geological time. Both volcanoes are part of the Barisan Mountain range that runs NW-SE for a 1000 miles along the whole length of Sumatra parallel to the Sumatra Trench & includes 35 active volcanoes. Although its last eruption was more than a century ago, Sibayak has geothermal activity in the form of steam vents and hot springs on and around the volcano. The vents produce crystalline sulfur, which was being mined on a small scale in 1979 (men carrying sacks down the mountain on their backs). Seepage of sulfurous gases has also caused acidic discolouration of the small crater lake part of which can be seen bottom middle.

In 1981 I was working in Medan, North Sumatra but as I was about to transfer to The Hague we decided to take vacation and travel around some other parts of Indonesia before leaving. We had just spent a few days in Yogyakarta and were now flying east to Bali over East Java and the Bromo Tengger Semeru National Park. The islands of Sumatra and Java lie on a long volcanic arc above a subduction zone where the Indo-Australia plate is moving beneath the Eurasia plate making it very volcanically active.

We climbed Mount Sibayak a fairly dormant volcano near Berastagi south of Medan. It is more than 100 years since it last erupted - very recently in geological time - but the Barisan Mountains are definitely still active. Mt Sinabung a few kilometres from here did erupt in 2010. Steam from the fumeroles can be seen on the mountain. The walk starts in these rice padi fields but climbs quite steeply through forest and then onto open rock. The crest is at 2,212 m (7,257 ft) and in the clouds it gets chilly when you're wearing shorts!.

Me & Francoise getting a close look at the sulphur around the fumerole of Mount Sibyak volcano.