PROCEEDINGS JOINT CONVENTION BALI 2007
The 32^nd HAGI, The 36^th IAGI, and The 29^th IATMI Annual Conference and Exhibition

ROCKFALL HAZARD AROUND RINJANI VOLCANO
WITH A SPECIAL REFERENCE TO SEMBALUN AREA

Didi S. Agustawijaya
Faculty of Engineering – Mataram University
ABSTRACT

Rinjani Volcano is one of active volcanoes around Indonesia Archipelago, which is known as a part of Ring of Fire. Rinjani volcano has erupted two times that created a huge lake of caldera on the summit of the volcano. The eruption has produced a great deal of rocks around the volcano, particularly on the top part of the volcano. These rocks are very loose, not compacted, and of course easy to fall when weather condition changes.

Rockfall is very dangerous when it occurs, and it can be very lethal to Sembalun people who live around the Rinjani volcano. Many factors are involved in this geological hazard. The type of rocks, physical characteristics, weathering, slopes and climate are among important factors involved in rockfall. However, the interaction of these factors is not fully understood yet, neither does the mechanism of rockfall. Quantitative measurement has been developed based on a number of factors identified in this research. Thus, this paper is aimed to evaluate the rockfall phenomenon, particularly around the Rinjani volcano.