TAGBILARAN CITY – The Mines and Geo-sciences Bureau (MGB) is slated to conduct an assessment of ‘quake-hit sinkholes in the province with the use of ground penetrating radar (GPR) recently acquired amounting to more than Php2 million, according to the Department of Environment and Natural Resources (DENR) through forester Nestor Canda, officer-in-charge of Provincial environment and Natural Resources Office.
GPR is a “geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures. In the right conditions, practitioners can use GPR to detect subsurface objects, changes in material properties, and voids and cracks,” according to Wikipedia.
MGB, earlier, reportedly said that there are about 1,300 sinkholes around the province that have been located as a result of the earthquake in 2013.
Among the most known of these are the one in Poblacion I and another in baragay Taloto of this city. One is in barangay Cambailan, Catigbian and the one in barangay Montesuerte, Carmen town. Underwater sinkholes are found in Tagbilaran Bay and off Panggangan island, Calape town.
Authorities concerned have issued threat advisory to abandon the areas where their houses are located near the sinkholes but none heed the call, report said.
Meanwhile, “common sense” in identifying areas for relocation sites where the quake victims’ core shelter are to be built has been endorsed by Arturo Alburo, MGB director.
The regional director suggested this to the municipal planners to fast track the repair/construction of victims’ dwellings destroyed after the tremor. The MGB issued this in apparent reference to snail pace task of providing geo-hazard assessments or “ground assessments.”
Alburo jokingly said that the municipal engineers may act as “MG” or “mora’g geologist” in identifying where the safe areas are in their respective turfs, though geo-hazard assessment is a “priority.” But identifying where these safe zones for relocation sites are is the first thing to do.
Among the towns that need “geohazard mapping” are sa Balilihan, Corella, Dauis, Panglao, Baclayon, Tagbilaran, Cortes, Albur, Sevilla, Sikatuna, San Isidro, Antequera, Loon, Maribojoc, Calape, Tubigon, Sagbayan, Catigbian, Clarin ug Inabanga. These are considered as the towns hardest hit by the tremor.
The director earlier said that a lot of requests were received by his office for the school site investigation and residential sites.
Public chools that have been assessed now totalled to 69; residential sites – 43 in the towns of Batuan, Tubigon and Clarin; a total of four (4) “clusters relocation sites” in the municipalities of Loay, Carmen, Tubigon ug clarin, MGB said.