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.
- Piecemeal rupture of the Mentawai patch, Sumatra: The 2008 Mw 7.2 North Pagai earthquake sequence. Journal of Geophysical Research. (2017).
- The 2008 Mw 7.2 North Pagai earthquake sequence: Partial rupture of a fully locked Mentawai patch. 6th International Symposium on Earth Hazard and Disaster Mitigation. (2016).
- Stress-driven relaxation of heterogeneous upper mantle and time-dependent afterslip following the 2011 Tohoku earthquake. Journal of Geophysical Research-Solid Earth. 121(1), 385-411. (2016).
- Footprints of past earthquakes revealed in the afterslip of the 2010 Mw 7.8 Mentawai tsunami earthquake. Geophysical Research Letters. 43(18), 9518–9526. (2016).
- Asthenosphere rheology inferred from observations of the 2012 Indian Ocean earthquake. Nature. (2016).
- Afterslip following the 2007 M-w 8.4 Bengkulu earthquake in Sumatra loaded the 2010 M-w 7.8 Mentawai tsunami earthquake rupture zone. Journal of Geophysical Research: Solid Earth. 121(12), 9034-9049. (2016).
- Joint inversion of afterslip and viscoelastic relaxation following the 2012 Mw 8.6 Indian Ocean earthquake. American Geophysical Union Fall Meeting. (2016).
- Micropaleontology of the 2013 Typhoon Haiyan deposit from the Leyte Gulf, Philippines.. Sedimentary Geology. 339, 104-114. (2016).
- Viscoelastic relaxation in a heterogeneous Earth following the 2004 Sumatra-Andaman earthquake. Earth and Planetary Science Letters. 431, 308-317. (2015).
- Postseismic relaxation in Kashmir and lateral variations in crustal architecture and materials. Geophysical Research Letters. 42(11), 4375–4383. (2015).