Geological Hazard

People and economies in Indonesia have been seriously affected by geological hazards such as earthquakes, tsunamis, volcanic eruptions, and landslides. The Indo-Australian plate penetrates beneath the Eurasian Plate causes the presence of the Indonesian subduction zone. Large earthquakes occurring along the subduction zone could trigger tsunami (e.g. the 2004 mega thrust Indian Ocean earthquake). A part of the subducting slab is melted forming magma and rises up to produce volcanoes. A dextral strike-slip fault was formed due to the oblique motion of the Indo-Australian Plate relative to the trench in order to accommodate the trench parallel component of the convergence. Although the magnitudes of earthquakes along the Sumatran Fault are relatively smaller than those along the subduction zone, earthquakes along the Sumatran Fault could destroy cities or towns as the epicenters are closer to the populated areas.

seulimeum_isc
Figure 1. The Aceh Segment and the Seulimeuem Fault. The Presence of the Seulimeuem Fault is closely related to the Seulawah Volcano.

Therefore, it is significantly important to improve the knowledge of the potentials of geohazards and the ability to reduce the risk of the disasters. The geohazard team of TDMRC of Syiah Kuala University focuses on research topics of earthquakes, tsunamies (sources of tsunamies), landslides, volcanic eruptions, and other related geological hazards. In Aceh, there are several secondary active faults including Batee,  Cemtral Aceh, Aceh Segment, and Seulimeuem Faults (Figure 1). We apply various methods including seismology, seismic hazard analysis, reflection seismic, and other near surface techniques as well as GIS. We also conduct risk assessment of possible geological hazards and provide information to stakeholders.

Recent Research
  1. Active fault observations and analysis using seismological methods, reflection seismic and geological studies along the Sumatran Fault.
  2. Local and regional earth imaging by using different seismic tomography techniques
  3. Paleo-tsunami study to understand the history of tsunamis in Aceh
  4. Seismic hazard analysis by using determination and probabilistic methods focusing on the Sumatran area.
  5. Geodynamic study by using GPS data in Aceh
  6. Application near surface geophysical methods to study tsunami sediment, landslides and water quality
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