The Philippine Institute of  Volcanology and Seismology - Department of Science and Technology (PHIVOLCS - DOST) confirmed a magnitude 5.0  earthquake that had struck General Nakar and Infanta, Quezon at around 3:10 pm on Thursday.

Shocks were also felt in the National Capital Region (NCR) and nearby provinces. Some of the cities that felt the shocks were Manila, Quezon, Makati, Mandaluyong and Pasig. PHIVOLCS  initially reported a magnitude 4.4 earthquake but raised the findings a few minutes later.

The earthquake hit 24 kilometers (km) northwest of General Nakar at a 13 km depth. The government agency did not report any damages by the earthquake.

Here is PHIVOLCS - DOST's earthquake information no. 4:

Reported Intensities

  • Intensity V : General Nakar and Infanta, Quezon
  • Intensity IV: Antipolo City; Angono, Rizal and Real, Quezon
  • Intensity III: Quezon City, Marikina City, Manila City, Makati City, Mandaluyong City, Pasig City, San Juan City, Pasay City, Tarlac City, San Mateo, Teresa, Tanay and Binangonan
  • Intensity II: Taguig City, Parañaque City, Caloocan City, Valenzuela City, Pateros Metro Manila; Bacoor, Cavite; San Pedro, Laguna; San Ildefonso, Bulacan; Baler, Aurora, Gabaldon and Nueva Ecija
  • Intensity I: Palayan City and Gapan City, Nueva Ecija

Instrumental Intensities

  • Intensity III: Quezon City and San Juan City (CDRRMO)
  • Intensity II: Pasig City, Malabon City, Cabanatuan City and  Mauban, Quezon
  • Intensity I: Muntinlupa City, Tagaytay City, Lucban, Alabat, Mulanay and Gumaca, Quezon; Guagua, Pampanga and Malolos, Bulacan

Meanwhile, here's a closer look to understand the meaning of earthquake intensity using the Philippine Institute of Volcanology and Seismology Earthquake Intensity Scale (PEIS).

Intensity I - Scarcely perceptible

  • Delicately balanced objects are disturbed slightly.
  • Still water in containers oscillates slowly.

Intensity II - Slightly felt

  • Felt by few individuals at rest indoors.
  • Hanging objects swing slightly.
  • Still water in containers oscillates noticeably.

Intensity III - Weak

  • Felt by many people indoors, especially in upper floors.
  • Hanging objects swing moderately.
  • Still water in containers oscillates moderately.
  • Feels like a light truck passing by.

Intensity IV - Moderately strong

  • Felt generally by people indoors and by some people outdoors.
  • Hanging objects swing considerably.
  • Motorcars may rock slightly.
  • Liquids in containers are slightly disturbed.
  • Water in containers oscillates strongly.
  • A rumbling sound may sometimes be heard.
  • Feels like a heavy truck passing by.

Intensity V - Strong

  • Felt by most people indoors and outdoors.
  • A strong shaking and rocking is felt throughout building.
  • Hanging objects swing violently.
  • Small, light, and unstable objects may fall or overturn.
  • Liquids spill from filled open containers.
  • Vehicles rock noticeably.
  • Leaves and twigs of trees shake.

Intensity VI - Very Strong

  • Furniture and other heavy objects are displaced.
  • Wall plaster may crack.
  • People may lose balance.
  • Small church bells may ring.
  • If on the road, it may feel like driving with flat tires.
  • Very old or poorly built houses and man-made structures are slightly damaged though well-built structures are not affected.
  • Limited rockfalls and rolling boulders occur in hilly to mountainous areas and escarpments.
  • Trees shake.

Intensity VII - Destructive

  • Heavy objects and furniture overturn or topple.
  • Difficulty standing on upper floors.
  • Old or poorly-built structures suffer considerable damage.
  • Some well-built structures are slightly damaged.
  • Some cracks may appear on dikes, fishponds, road surface, or concrete hollow block walls.
  • Limited liquefaction, lateral spreading and landslides are observed.
  • Trees shake noticeably.

Intensity VIII - Very Destructive

  • People will find it difficult to even stand outdoors.
  • Many well-built buildings are considerably damaged.
  • Concrete dikes and the foundations of bridges are destroyed by ground settling or toppling.
  • Railway tracks are bent or broken.
  • Utility posts, towers, and monuments may tilt or topple.
  • Water and sewer pipes may be bent, twisted, or broken.
  • Liquefaction and lateral spreading cause manmade structures to sink, tilt, or topple.
  • Numerous landslides and rockfalls occur in mountainous and hilly areas.
  • Boulders are thrown out from their positions particularly near the epicenter.
  • Fissures and faults rupture.
  • Trees shake violently.
  • Water splashes over dikes or the banks of rivers.

Intensity IX - Devastating

  • People are forced to the ground.
  • Most buildings are totally damaged.
  • Bridges and elevated concrete structures are toppled or destroyed.
  • Numerous utility posts, towers, and monuments are tilted, toppled, or broken.
  • Sewer pipes are bent, twisted or broken.
  • Landslides and liquefaction with lateral spreadings and sandboils are widespread.
  • The ground is distorted into undulations.
  • Trees are shaken very violently with some toppled or broken.
  • Boulders are commonly thrown out.
  • River water splashes violently on slops over dikes and banks.

Intensity X - Completely Devastating

  • Many trees are toppled, broken, and uprooted.
  • Practically all man-made structures are destroyed.
  • Massive landslides and liquefaction, large-scale subsidence and the uplifting of land forms and many ground fissures are observed.
  • Changes in river courses and destructive seiches in large lakes.

Here are some posts from Twitter users regarding the magnitude 5.0 earthquake.






What do you think of the Magnitude 5.0 earthquake that hit General Nakar, Quezon? What about the shocks felt In Metro Manila and nearby provinces? Let us know your thoughts in the comments section below.