The Centre for Geohazard Observations (CGO) is responsible for installing and managing the Observatory’s geophysical and other field instrumentation networks spread over seven countries across South and Southeast Asia. It supports EOS in various technical matters include acquiring, computing, and archiving geophysical data. The Office strives to provide a better and more conducive technological environment for our scientists both in the field and in the lab.
The Centre is involved in:
The two major continuous Global Positioning System (cGPS) networks in South and Southeast Asia that the CGO maintains are the Sumatran GPS Array (SuGAR) and the Myanmar-India-Bangladesh-Bhutan (MIBB) GPS array. The information collected from these networks can potentially improve tsunami warning systems after a major earthquake event.
Seismic networks monitor earthquakes and volcanic activities in real time and are linked to the cGPS stations. The CGO works closely with other research institutes to operate these networks. Our collaborators include the Philippine Institute of Volcanology and Seismology (PHIVOLCS) and Center of Volcanology and Geological Hazard Mitigation (CVGHM). The Observatory provides important information about current tectonic and volcanic activities, and work with our international collaborators to understand earthquakes and volcanic activity that occur in the region.
Other Surveying Operations
Ground-LiDAR is a ground-based laser scanning technique that provides real topography in ultra-high resolution for areas spanning up to several kilometres. The CGO is also planning to carry airborne-LiDAR surveys in Nepal. This technique is ideal for regional high-resolution surveys.
Ground-penetrating Radar (GPR) is a technique that uses high-frequency radio waves to image the subsurface of the Earth. This technique is often used by our scientists to study sediment deposits related to coastal hazards in Southeast Asia.
The infrasound monitoring system employed by EOS was first used to monitor volcanic eruptions from Indonesia. This monitoring system detects low-frequency sound waves, and the data collected will provide information on the location and explosivity of the eruption, allowing our scientists to determine the impact of volcanic ash on air traffic in and around Singapore.
Small Unmanned Aerial Vehicle (UAV) surveys provide detailed information of temporal landscape changes, post-disaster landscape, and potentially high-resolution digital terrain models acquired from aerial photos taken from the drone. Our scientists use a combination of techniques, including images taken from the UAV, to investigate faults and volcanic activities.
- Postseismic relaxation in Kashmir and lateral variations in crustal architecture and materials. Geophysical Research Letters. 42(11), 4375–4383. (2015).
- The 2010 Mw 7.8 Mentawai earthquake: Very shallow source of a rare tsunami earthquake determined from tsunami field survey and near-field GPS data. Journal of Geophysical Research. (2012).
- Source model of the 2009 Mw 7.6 Padang intraslab earthquake and its effect on the Sunda megathrust. Geophysical Journal International. 190, 1710-1722. (2012).
- Another potential source of destructive earthquakes and tsunami offshore of Sumatra. Geophysical Research Letters. 38, (2011).
- Partial rupture of a locked patch of the Sumatra megathrust during the 2007 earthquake sequence. Nature. 456, 631-5. (2008).