Volcanism Blog reader and commenter Ton van de Aa of Veghel in The Netherlands has very kindly contributed some pictures of the volcanoes of Sulawesi which he took during a recent visit to Indonesia. Six of the pictures are included in this post: the volcanoes featured are Klabat, Lokon, Mahawu and Tondanu Caldera, all on Sulawesi, which is one of the most volcanically-active parts of Indonesia, which is of course one of the most volcanically-active parts of the world.

The symmetrical 1995-metre cone of Klabat volcano, which produces fumarolic activity but has no records of historical eruptions.

Lokon volcano, the higher of the two peaks of the Lokon-Empung volcanic complex. Lokon and Empung are among the most active volcanoes of Sulawesi.

The crater of Mahawu volcano. The crater is 180 metres wide and 140 metres deep, and is occasionally host to a small crater lake. Mahawu’s activity, notes the GVP, ‘has been restricted to occasional small explosive eruptions recorded since 1789′, but there has been recent (1994) fumarolic activity within the crater. The place apparently has a strong sulphur smell. Local people write their names at the bottom of the crater using stones, in the belief that this will bring good luck.

Another view of Mahawu crater.

And a further view of the interior of Mahawu crater.

A view of Tondano Caldera, a 20 x 30 kilometre quaternary caldera in northern Sulawesi. The eastern rim of the caldera forms the skyline on the right.

Many thanks to Ton van der Aa for these images.