Rinjani volcano on the island of Lombok, Lesser Sunda Islands, rises to 3,726 m, second in
height among Indonesian volcanoes only to Sumatra's Kerinci volcano. Rinjani has a steep-
sided conical profile when viewed from the east, but the west side of the compound volcano
is truncated by the 6x8,5 km, oval-shaped Segara Anak caldera.
The western half of the caldera contains a 230 m deep lake whose crescentic form results from
growth of the post-caldera cone Barujari aqt the east end of the caldera. Historical eruptions at
Rinjani dating back to 1847 have been restricted to Barujari cone and consist of moderate
explosive activity and occasional lavaflows that have entered Segara Anak lake.
Thursday, October 7th, 2004
A new explosion happened to day and sent an ashcolumn 4.500 m up in the air.
Hikers are banned from climbing on the volcano, but no evacuation of villages yet.
From visual observations on 2-4 October 2004 ash explosions still continues and are sending
sent ash columns that rose to ~ 300-800 m above the summit. A grey, thick ash column drifted
to the North. Point of explosion was in North-East slope of Baru Jari volcano. Light material
from the peak felt down around the Baru Jari volcano. Every explosion was accompanied with
detonation sounds. No visible change over the Segara Anakan Lake meant that no water was
entering to the caldera. Interval time between explosions was in range between 5 to 160
Saturday, October 2nd, 2004
The Volcanological Society of Indonesia (VSI) reported that the Rinjani volcano erupted
yesterday at 05:30 am.
Since the increasing of volcanic quakes on 5 September 2004, volcanic activities on Rinjani
continue increasing, and finally Rinjani was erupted on 1 October 2004 at 5.30 WITA
Activity volcanic visually was not detected from the
post monitoring at Sembalun Lawang
An ash-bearing eruption plume rises on June 30, 1994 above the summit crater of Barujari,
a pyroclastic cone on the floor of Rinjani's Segara Anak caldera. Steam rises at
the lower right from a lava flow that began erupting during the earlier stages of the eruption,
which began on June 3.
Photo courtesy of Volcanological Survey of Indonesia, 1994
Photograph of Barujari cone (left) and Rombongan dome (right) on November 21st, 1994,
with Segara Anak lake in the foreground. View is looking approximately SW from the NE caldera rim.
Courtesy of P.M.Vincent.