This is an open access article distributed under the CC BY 4.0
Volume 19 article 843 pages: 688-697
Landslides frequently occur in Indonesia, especially in the geothermal areas located on Sumatra's mountainous island.
On April 28, 2016, around 04:30 Western Indonesia Time, a landslide-induced debris flow occurred in Lebong
District, Bengkulu Province, Indonesia. The source area of the landslide was located at Beriti Hill on the Bukit Barisan
Mountain Range. It resulted in 6 fatalities and damage to infrastructures such as geothermal facilities, roads, water
pipes, houses, and bridges. Subsequent landslides and debris flows occurred on April 30, May 2, and 3, 2016. Therefore,
this study aims to examine the mechanism and to know the most significant contributing factor to the Beriti Hill
landslide. Field investigation, soil sampling, XRD analysis, and Lidar analysis were carried out in the research. Beriti
Hill is a geothermal area with many manifestations and is composed of volcanic rocks. Alteration processes produced
a thick layer of soil from volcanic rocks. The thick soil dominated by clay minerals and steep slopes is the dominant
controlling factor of a landslide, triggered by high rainfall intensity. Increasing water saturation in the landslide material
due to high rainfall is the most contributing factor to the developing debris flow from the landslide. Debris flows are
recurring events based on the Air Kotok river's stratigraphic data downstream of the landslide area. The debris flow
material is toxic due to the low pH from the geothermal process. Therefore, the alluvial fan deposit area from Beriti
Hill debris flow is a hazard zone and unsuitable for settlement and agriculture. This research shows that a landslide
mechanism in a geothermal area was controlled by clay mineral presence due to the alteration process. The future of
landslide risk assessment in the geothermal area can be considered by detailing clay type and their characteristic that
significantly contributes to debris flow.
We would like to thanks PT. Pertamina Geothermal Energy
(PGE) for their funding during field investigation. We also
thank Egy Erzagian, Thema Arrisaldi, and Anissa Nur Amalina
from Gama-InaTek for their support during fieldwork.
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