STRUCTURAL GEOLOGYREPORT ON

MALALAG, DAVAO DEL SUR

Proponents:Lejano, Benedict A.Munoz, Daniel A.

BSEM- 3

Overview

Malalag is a 1st class municipality in the province of Davao del Sur, Philippines. According to the 2010 census, it has a population of 119,334 people in 26,069 households. Malalag is stragetically located in the heart of Davao del Sur. Malalag is an argicultural center of Davao del Sur. Its main products are Banana, Cocunut and other fruits and vegetables. Malalag is also a fishing center of Davao del Sur. Many fish cages are lying in Malalag Bay. Malalag is also wealth in mining indusrty. Because of this, the Municipality of Malalag will soon to be a city in year 2016.

http://en.wikipedia.org/wiki/File:Ph_locator_davao_del_sur_malalag.png

Preparing for fieldwork

Work Plan

Our work plan is to divide 200 meters to 10 stations measuring 20 meters each. At each station, we measure the direction of each station, slope direction, and the structures in our area.

(October 1, 2011)

1:00- 2:00 pm

 

Assembly time at Gate 1 of USeP

2:00- 4:00 pm Travel from Davao City to Malalag, Davao del Sur

4:00- 4:15 pm Familiarization to the area

4:15- 5:30 pm Travel from Malalag to Claire John Resort in Digos City

5:30- 6:00 pm Rest time

6:00- 7:00 pm Travel from Claire John to Penongs in Digos City

7:00- 8:00 pm Dinner at Penongs

8:00- 9:00 pm Free time at Digos City park

9:00- 10:00 pm Travel from Digos City park to Claire John

10:00-12:00 am Free/ sleep time

(October 2, 2011)

12:00- 5:30 am

 

Sleep time

5:30- 7:00 am Wake up/ preparation for the fieldwork

7:00- 8:00 am Pack-up/ assembly time

8:00- 9:30 am Travel from Claire John, Digos City to Malalag

9:30- 11:00 am Fieldwork in progress

~ Measuring the site

~ Division of the site into 10 stations

~ Observing the bearing of each station

~ Measuring the slope direction

~ Locating and measuring the structures in the site

11:00- 12:00 nn Lunch break at local eatery in the area

12:00- 2:30 pm Pack-up/ preparation to go home

Travel from Malalag, Davao del Sur to Davao City

2:30-3:00 pm Home sweet home!

Equipment and supplies

The following equipment and supplies were used in the course of our survey: 1.) Tape Measure

A tape measure or measuring tape is a flexible form of ruler. It consists of a ribbon of cloth, plastic, fiber glass, or metal strip with linear-measurement markings. It is a common measuring tool. Its flexibility allows for a measure of great length to be easily carried in pocket or toolkit and permits one to measure around curves or corners. Today it is ubiquitous, even appearing in miniature form as a keychain fob, or novelty item. Surveyors use tape measures in lengths of over 100 m (300+ ft).

Equipment and supplies

2.) Brunton CompassA Brunton pocket compass or Brunton

compass is a compass consist of a magnetized steel needle mounted on a pivot at the center of a graduated circle. The Brunton compass combines the main features of a sighting compass, prismatic compass, a hand level, and a clinometer.

Data collection

Survey sites

The site of our survey is at the municipality of Malalag at the province of Davao del Sur with the coordinates of 6° 35′ 45.6″ N, 125° 23′ 56.4″ E. It is southwest of central Davao City and approximately 45 km distance travel by commercial buses and other land vehicle for three (3) hours through Davao City – Sta. Cruz – Digos City – Padada – Sulop National Road.

Field sheetsSta. No. Distance Bearing Remarks

1 20 m. N 52° E Stone piles

2 20 m. N 53° E Infront of Basktball ring

3 20 m. N 41° E Beside Coconut trees

4 20 m. N 10° E Infront of Bracero Eatery

5 20 m. N 19° E Infront of Coca-cola/ Bracro

Eatery signage

6 20 m. N 29° E Infront of public restroom

7 20 m. N 54° E Infront of a blue rattan house

8 20 m. N 71° E Between old asphalt road

remains and woody tree

9 20 m. S 87° E Infront of nipa hut

10 20 m. N 78° E Beside a shady tree

For stations 1 and 2, the bearings are N 52° E and N 53° E, respectively. Since from stations 1 to 2, the road is almost a straight line. Whereas on station 3, a curve begins to develop and it continues until station 4 (N 10° E).

Another curve forms from stations 5 to 10 with bearings of N 19° E, N 29° E, N 54° E, N 71° e, S 87° E, and S 78° E, respectively. The curve between these stations are opposite to the first curve.

We also measured the slope direction at each station. They are as follows:

Sta. No. Distance Slope Direction

1 20 m. S 26° E

2 20 m. S 28° E

3 20 m. S 46° E

4 20 m. S 65° E

5 20 m. S 47° E

6 20 m. S 65° E

7 20 m. S 64° E

8 20 m. S 31° E

9 20 m. S 11° E

10 20 m. S 14° E

We also measured any structure/s at each station. They are as follows:

Sta. No. Structure/s Bearing

1 Canal N 63° E

2 Canal N 51° E

3 Canal N 34° E

4 Canal N 19° E

5 Canal N 18° E

6 Canal N 28° E

7 Canal N 49° E

8 Canal N 72° E

9 Canal S 84° E

10 Canal S 79° E

Methodology

The methodology used in this fieldwork is to follow the following procedure:

1.) Measure 10 stations with 20 meters each to a total of 200 meters using a tape measure.2.) At each station, measure its bearing with the aid of a Brunton compass.3.) Measure any structures at each station (if available).4.)At each station, measure the slope direction.

Conclusion

Conclusion

Based upon the observations and further assessments, the group had derived the following conclusions:

1.) Bo. Baluyan, Malalag , Davao del Sur constitutes generally of interlingering of thrusted sedimentary rocks and porphyritic andesite intrusions.

2.) Since it has a previous history of rock and/ or debris slide, it has a great possibility that it will occur again.

3.) The steepness of the area can also contribute to the rock and/ or debris slide.

4.) Due to elevated topography of the region, resorts, restaurants, and other socially enriching businesses is of good economic market to be established in the area.

Photos

GOD SPEED!

By:Group 4

Lejano, BenedictMunoz, Daniel