Earthquake Impacts in Davao del Sur and Davao del Norte: MGB XI Updates
Landslides, tension cracks, slumps, rocks rolling downslopes were among the findings of the on-going monitoring and assessment of the areas affected by earthquake that consecutively occurred in October 16, 29 and 30, 2019 in Mindanao.
DAVAO DEL SUR
In So. Marawer, Purok Tagumpay 2, Brgy. Kapatagan, an approximately 250 meter-length tension cracks was observed. It has a crack opening ranging from 1 inch- 5 inches and with a maximum vertical displacement of 5 inches. It was accordingly caused by 6.3 magnitude earthquake in October 16 and was aggravated during the 6.6 magnitude earthquake in October 29. It was recommended that the affected houses will be immediately relocated since the area is highly susceptible to landslide.
In Purok Talisay, Brgy. Kiagot, there were reported cases of rock rolling downslope. Loose cobble to boulder-sized volcanic rock fragments were observed along the slope. The MGB team recommended for conduct of further assessment and for the relocation or temporary evacuation of household directly situated in the area as it is highly susceptible to mass movement.
Series of tension cracks was also observed in So. Bandera, Brgy. Balabag. A slump was further noted with a maximum vertical displacement of 30 cm.
Another landslide was observed approximately 2 kilometers northeast of the Purok Centro. Adjacent to the landslide crown, series of tension cracks were also observed.
Several areas of Brgy. Goma were also affected. In So. Kiola, a tension crack with a vertical displacement reaching up to 45 cm was noted which imposes threat to the 2 houses that are adjacent to it. It was accordingly occurred in October 30 earthquake.
In Purok Alom, So. Nodila, a massive landslide was observed wherein possible debris flow may pose a threat to damming of Napan River.
DAVAO DEL NORTE
As the LGU also prioritizes assessment of earthquake impacts in schools, the MGB team surveyed two (2) schools in Brgy. Palma Gil wherein structural cracks were observed. In Gatong Elementary School- Igang Extension, it was remarked for temporary termination of four (4) classrooms and for inspection of proper authorities.
In Gatong Elementary School, aside from the structural cracks on walls, gap between the wall of a classroom to the floor was also noted as well as a vertical displacement on the floor outside the classrooms in its old building. The MGB team recommended for immediate inspection and assessment by the appropriate authorities.
The MGB-XI’s above-mentioned update covers November 7-8, 2019 monitoring and assessment in close coordination with the Provincial Environment and Natural Resources Offices (PENROs), Local/Municipal Disaster Risk and Reduction and Management Offices (L/M DRRMO) and Philippine Institute of Volcanology and Seismology or PHIVOLCS.