Volcanic Arcs in the Philippines - GOP (Geology Board Exam Reviewer)

Hi, there!

Who said making quality content for a blog is easy? I think no one ever say that but I just kinda wanna point out that it's not an easy job. I am not complaining, rather, I am just sharing. Haha.

I just had to count ~360 volcanoes! (I may have an error but it's only +2!) I gotta say, we may have some weird nomenclature for some of our volcanoes. But it was a nice experience. I just found out that Jala-jala is formally known as Sembrano. We also have our version of Sugarloaf (Sugarloaf Complex) in Zamboanga and our very own Costa Rica! I think I laugh a little inside when I saw one that is named 'Cocoro'. 

Anyway, here are some notes re: Volcanic Arcs.

Five distinct volcanic belts (Pliocene-Holocene volcanoes)

1. Luzon Volcanic Arc (Manila Trench)

2. East-Philippine Volcanic Arc (Philippine Trench)

3. Negros-Panay Arc (Negros Trench)

4. Sulu-Zamboanga Arc (Sulu Trench)

5. Cotabato Arc (Cotabato Trench)

Active volcanic chain (e.g. Mt. Apo) and volcanic cones in central Mindanao

1. located more than 100 km away from any active subduction zone (e.g. Philippine Trench)

2. (Sajona, 1995) probably products of partial melting of a detached slab underneath Mindanao

Most Active Volcanoes (with short response period)

1. Mayon

2. Taal

3. Bulusan

4. Canlaon

5. Hibok-Hibok

Mt. Pinatubo 1991 Eruption

-  largest eruption of the 20^th century in terms of volume ejecta and area covered with ashfall

PHIVOLCS DATABASE

 

1. ACTIVE VOLCANOES (24)

- Erupted within historical times (within the last 600 years)

- accounts of these eruptions were documented by man within the last 10,000 years based on the analyses of material from young volcanoes

 SOURCE: (Delos Reyes, et. Al. 2018, “A synthesis and review of historical eruptions of Taal Volcano, Southern Luzon, Philippines)        

1. Babuyan Claro, Babuyan Island Group, Cagayan in Luzon

19.52408 121.95005

2. Banahaw, Boundaries of Laguna and Quezon in Luzon

14.06038 121.48803

3. Biliran (Anas), Leyte in Visayas

11.63268 124.47162

4. Bud Dajo, Sulu in Mindanao

6.01295 121.05772

5. Bulusan, Sorsogon, Bicol Region in Luzon

12.76853 124.05445

6. Cabalian, Southern Leyte in Visayas

10.27986 125.21598

7. Cagua, Cagayan in Luzon

18.22116 122.1163

8. Camiguin de Babuyanes, Babuyan Island Group, Cagayan in Luzon

18.83037 121.86280

9. Didicas, Babuyan Island Group, Cagayan in Luzon

19.07533 122.20147

10. Hibok-hibok, Camiguin in Mindanao

9.20427 124.67115

11. Iraya, Batan Island, Batanes in Luzon

20.46669 122.01078

12. Iriga, Camarines Sur in Luzon

13.45606 123.45479

13. Isarog, Camarines Sur in Luzon

13.65685 123.38087

14. Kanlaon, Negros Oriental

10.41129 123.13243

15. Leonard Kniaseff, Davao del Norte

7.39359 126.06418

16. Makaturing, Lanao del Sur

7.64371 124.31718

17. Matutum, Cotobato in Mindanao

6.36111 125.07603

18. Mayon, Albay, Bicol Region in Luzon

13.25519 123.68615

19. Musuan (Calayo), Bukidnon in Mindanao

7.87680 125.06985

20. Parker,  South Cotobato/General Santos/ North Cotabato/Sarangani Provinces in Mindanao

6.10274 124.88879

21. Pinatubo, Boundaries of Pampanga, Tarlac and Zambales in Luzon

15.14162 120.35084

22. Ragang, Lanao del Sur and Cotobato in Mindanao

7.69066 124.50639

23. Smith, Babuyan Island Group, Cagayan in Luzon

19.53915 121.91367

24. Taal, Batangas in Luzon

14.01024 120.99812

2. POTENTIALLY ACTIVE VOLCANOES (26)

Source: https://wovodat.phivolcs.dost.gov.ph/volcano/ph-volcanoes

- Morphologically young-looking but with no historical or analytical records of eruption

3. INACTIVE VOLCANOES (~360)

- No recorded eruptions

- Physical form has been intensively weathered and eroded

- Bearing deep and long gullies

Hasta la proxima!!