ROAD SURVEY

Presenters:Dean Mark L. Catan

Mirafe BarrancoDaryl Sheen Patacsil

•Structural Geology is the study of the three-dimensional distribution of rock units with respect to their deformational histories. •The primary goal of structural geology is to use measurements of present-day rock geometries to uncover information about the history of deformation (strain) in the rocks, and ultimately, to understand the stress field that resulted in the observed strain and geometries.•The study of geologic structures has been of prime importance in economic geology, both petroleum geology and mining geology.•Structural geology is a critical part of engineering geology, which is concerned with the physical and mechanical properties of natural rocks.

I. Introduction

II. Location

•The Surveying is located at the Hills of Shrine Hills, Matina, Davao City. The surveying started at the entrance of famous resto bar, Jack’s Ridge and finished in Barangay Ma-a in 1500 meters in distance. Shrine Hills was chosen as the location of the surveying because of its elevated and steep roads.

•Shrine Hills is located in Matina elevated from the city proper and crisscross in Barangay Ma-a. A well-cemented city road. It is known for the three major networks in the Philippines that seated in the upper part of Shrine Hills. A place for a commercial lot intended for telecommunication companies, plantation and resto bars.

III. Observations and Findings

A. Observations

•The Surveying is divided into six groups with assigned distance, 250 meters.•The first point has the distance of 30 meters and the bearing is S45 E while the second point has a distance of 24, the third up to the eighth point has the same distance with the first point. The last point has a distance of 16 meters completing the required distance. We observed that the fourth and the fifth point has the same bearing and the sixth and the seventh point are the elevated area.•We observed also two specific open regions in the surveyed area. First is in the second point and the second one is in eighth point with an elevated area.

The table below explains the observations taken from the surveyed area.

STA. A Station Name Distance Bearing Angle of Elevation Remarks

1-2 Fence 30 meters S45E Cemented area, plane area, not shaded

2-3 Corner 24 meters S28E Cemented area, corner, plane area, near the waiting shed

3-4 Grass 30 meters N11E Cemented area, in front of Shrine Hills, grassy

4-5 Gemilina Tree (1) 30 meters N15E Cemented area, in front of Shrine Hills, grassy

5-6 Gemilina Tree (2) 30 meters N15E Cemented area, in front of Shrine Hills, grassy, shaded

6-7 Post (1) 30 meters N5E Cemented area, elevated, not shaded, grassy

7-8 Post (2) 30 meters N4E Cemented area, elevated, not shaded, grassy

8-9 Big Tree 30 meters N16E Cemented area, near open area, grassy,

9-10 Electric Post 16 meters N30E Cemented area, not shaded, grassy

B. FindingsWe found evidences that the top portion of Shrine Hills in Matina in Davao City is stable and could be built by infrastructures, houses and commercial lots, but its anticline or flanks are weak that could cause soil avalanche just like what had happened in Cherry Hills Subdivision.Just like other any terrain map, it designates the different landforms and their vulnerabilities and as our observations, we have determined that the entire Shrine Hills, the highest portion at top of the ridge is stable. It does not have much movement. But the flanks are moving and unstable because the kinds of soil it have are weak and easy to collapsed by excessive rainfalls. They are weak and we know there are a lot of developments on the slopes. We observed that there are a lot of open area a long side the central road of Shrine Hills and prone to landslides.

Some portions of Shrine Hills those are highly vulnerable to geologic hazards because they are part of the Mindanao eastern seaboard. These include flashflood and landslides that are merely happening in the flank or anticline of Shrine Hills. And as we know the Philippines is a chopsuey of natural hazards, with all disasters happening here except snow-related hazards. These evidences are supported from the articles who tackled the geologic study of Shrine Hills and professional Geologists.

IV. Conclusions

•We therefore conclude that the top portions of the Shrine Hills are stable, livable and could erect some infrastructures and commercial lots. On the other hand, the lateral sides of the hills are weak, vulnerable and prone to disasters such as landslides and flashflood. The flanks of Shrine Hills are moving and not advisable to build infrastructure and commercial lot.

•We also conclude that these geologic events could be happened in geological sequence and could be recurring in the following days.

V. Recommendations

These are the following recommendations for Shrine Hills:

•The developers should be aware with the hazard prone area and the vulnerable area in the particular place to refrain problems.•Further study to the hazard prone area of Shrine Hills should be executed.•Environmental Projects should be proposed in order to mitigate the geo-hazard in the area.

VI. Photos

VII. Map