GEOLOGIC HISTORY
Rinjani is a compound volcano located on Lombok Island in
the Nusa Tenggara (Lesser Sunda) Islands region of
Indonesia. Its summit (elevation 3,726 m) sits on the east
side of the oval-shaped Segara Anak caldera. The caldera
contains a "c-shaped" lake with the east end occupied by
Rombongan dome and Barujari cone. Barujari has a elevation
of 2,376 m and is constructed of both lava flows and
pyroclastic deposits.
Historic Activity:
- The first reported historical eruption occurred in
September 1847.
- Fairly regular activity continued from then until
August 1966 when a small new cone formed and lava flows
entered the lake.
Recent Activity:
- In May, 1994 a glow was noticed on the crater floor
of Barujari cone. On June 3, 1994, Barujari cone began
erupting by sending an ash plume 500 m high. During the
next few days thick plumes rose 1,500 m above the summit
and aircraft warnings were issued. Eruptions were
continuing in early July. Activity of some kind was
apparently continuing in late October. On Nov. 3, a cold
lahar from the summit area traveled down the Kokok
Jenggak River killing 30 people. Local volcanologists
noted that additional lahars could be triggered by heavy
rainfall.
- A small ash plume was reported on Sept. 12,
1995.
Data Sources
- Global Volcanism Network (V. 19, No. 5 and V. 20, No.
10).
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