10/10/2025
𝙰𝚌𝚝𝚒𝚟𝚎 𝚃𝚛𝚎𝚗𝚌𝚑𝚎𝚜 𝚊𝚗𝚍 𝙵𝚊𝚞𝚕𝚝𝚜 𝚒𝚗 𝚝𝚑𝚎 𝙿𝚑𝚒𝚕𝚒𝚙𝚙𝚒𝚗𝚎𝚜 (𝙿𝚊𝚛𝚝 2)
By:Marietta Pangan, Kaizen PRESS Services (2013)
Locator/Identifier of Magnitude 6.9 Earthquake,
Epicenter Bogo City, Cebu . September 30, 2025, at 21:59:43 PHT Bogo Bay Fault part of Philippine Fault Zone (PFZ)
DIFFERENCE:
🛤𝙁𝙖𝙪𝙡𝙩: A zone of fractures or a crack in the Earth's crust where two blocks of rock move relative to each other.Faults are fractures on the Earth’s crust where blocks of rocks move relative to one another. It can be small and localized or hundreds of kilometers long.
🏝𝙏𝙧𝙚𝙣𝙘𝙝. Typically a long, narrow depression on the Earth's surface or the ocean floor.
The Philippine Archipelago has numerous active faults. The most notable of these are:
⚠️𝙑𝙖𝙡𝙡𝙚𝙮 𝙁𝙖𝙪𝙡𝙩 𝙎𝙮𝙨𝙩𝙚𝙢 (𝙑𝙁𝙎): A system of active faults composed of:
📌𝑻𝒉𝒆 𝑾𝒆𝒔𝒕 𝑽𝒂𝒍𝒍𝒆𝒚 𝑭𝒂𝒖𝒍𝒕: Considered the most dangerous in the area. Approximately 100 kilometres long, the dominantly right-lateral strike-slip fault system in Luzon runs through Marikina, Quezon City, Pasig, Taguig, and Muntinlupa in Metro Manila, as well as nearby provinces like Rizal, Laguna, Cavite, and Bulacan.
📍1.𝒂.𝑴𝒂𝒓𝒊𝒌𝒊𝒏𝒂 𝑽𝒂𝒍𝒍𝒆𝒚 𝑭𝒂𝒖𝒍𝒕: A segment of the VFS that runs along the Marikina Valley and is considered a significant threat to Metro Manila due to its potential to cause large-magnitude earthquakes.
📌𝑬𝒂𝒔𝒕 𝑽𝒂𝒍𝒍𝒆𝒚 𝑭𝒂𝒖𝒍𝒕 𝑳𝒊𝒏𝒆: A 10-kilometer-long active fault located in the eastern part of the Greater Metro Manila Area (GMMA) in the Philippines, running parallel to the larger West Valley Fault.
⚠️𝙋𝙝𝙞𝙡𝙞𝙥𝙥𝙞𝙣𝙚 𝙁𝙖𝙪𝙡𝙩 𝙕𝙤𝙣𝙚 (𝙋𝙁𝙕), 1,200 km-long strike-slip fault that runs from Luzon to Mindanao. traversing the following areas of Ilocos Region, Nueva Ecija, Quezon Province, Masbate, Leyte, CARAGA Region, Davao Gulf & Davao Oriental.
📌𝗘𝗮𝘀𝘁𝗲𝗿𝗻 𝗮𝗻𝗱 𝗪𝗲𝘀𝘁𝗲𝗿𝗻 𝗣𝗵𝗶𝗹𝗶𝗽𝗽𝗶𝗻𝗲 𝗙𝗮𝘂𝗹𝘁𝘀:: Cut by a significant, single tectonic feature of the Philippine Fault Zone. While there is no "Eastern" or "Western" Philippine Fault, the Philippines is bordered by east-facing and west-facing subduction zones.
📌𝗔𝗯𝗿𝗮 𝗥𝗶𝘃𝗲𝗿 𝗙𝗮𝘂𝗹𝘁: A major fault system in northwestern Luzon.
📌𝗚𝘂𝗶𝗻𝗮𝘆𝗮𝗻𝗴𝗮𝗻 𝗙𝗮𝘂𝗹𝘁: An active segment of the larger Philippine Fault Zone in Quezon Province.
📌𝗪𝗲𝘀𝘁 𝗣𝗮𝗻𝗮𝘆 𝗙𝗮𝘂𝗹𝘁: An active fault line stretching approximately 90 kilometers across the provinces of Iloilo, Antique, Capiz, and Aklan.
📌𝗠𝗮𝘀𝗯𝗮𝘁𝗲 𝗙𝗮𝘂𝗹𝘁: A segment of the much larger, active Philippine Fault Zone in Masbate Island.
📌𝗦𝘂𝗿𝗶𝗴𝗮𝗼 𝗙𝗮𝘂𝗹𝘁 𝗟𝗶𝗻𝗲: A segment of the major Philippine fault system located in northeastern Mindanao.
⚠️𝘾𝙚𝙣𝙩𝙧𝙖𝙡 𝙋𝙝𝙞𝙡𝙞𝙥𝙥𝙞𝙣𝙚 𝙁𝙖𝙪𝙡𝙩 𝙕𝙤𝙣𝙚: A major, active fault system in the Philippines that runs through Luzon, Leyte, and Masbate islands.
⚠️𝘾𝙤𝙩𝙖𝙗𝙖𝙩𝙤 𝙁𝙖𝙪𝙡𝙩 𝙎𝙮𝙨𝙩𝙚𝙢: A system in Mindanao that has been the source of a series of significant earthquakes.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS-DOST)