Public may ask PHIVOLCS if their area is transected by fault line

admin   •   June 3, 2015   •   4823

PHIVOLCS Geologist Jeffrey Cruz shows the different types of ground rupture.

QUEZON CITY, Philippines — The public may ask Philippine Institute of Volcanology and Seismology (PHIVOLCS) for assessment of their area if it is hazardous or transected by fault line.

The possible dangers that may befall places transected by a fault line can be clearly seen from the photos presented by PHIVOLCS.

The initial danger from a movement on an active fault is ground rupture or surface rupture. This is when movement on a fault breaks through to the surface.

PHIVOLCS Geologist Jeffrey Perez said on demonstration of different ground ruptures documented from past big earthquakes struck in the country, “As what we saw in 1990 Luzon earthquake, this embankment was joined and aligned before the quake happened. After the quake, a rupture occurred with a length of 120 kilometers. And the horizontal displacement of the embankments in this area was 6 meters. ”

“Although coconut trees can withstand typhoons this one was no match for the magnitude 6.2 earthquake in Masbate in 2003.”

Another example was the Bohol earthquake in 2013 when it moved up a side of the ground by 2.5 meters.

It may also happen to the valley fault system that stretches across Bulacan, Metro Manila, Rizal, Cavite and Laguna.

The agency said, more people are expressing their interest after the valley fault system was launched.

PHIVOLCS is one of the government agencies mandated to issue environmental compliance certificate that is required by the LGU during building constructions.

If you want to be sure if your place is in the buffer zone of a fault line, you may ask PHIVOLCS for an assessment.

Just bring your property vicinity map, tittle or tax declaration and 100 pesos. (REY PELAYO / UNTV News)

For inquiries:
Address: PHIVOLCS Building, C.P. Garcia Avenue, U.P. Campus, Diliman Quezon City Philippines
E-mail: phivolcs_mail@phivolcs.dost.gov.ph; phivolcs.mail@gmail.com
Telephone: +632 426 1468 to 79
Fax: +632 929 8366, 927 4524
Official Website: http://www.phivolcs.dost.gov.ph

Pangambang sumabog ang Mt. Taal matapos ang malakas na lindol sa Batangas, pinawi ng Phivolcs

Robie de Guzman   •   December 25, 2020

MANILA, Philippines – Pinawi ng Philippine Institute of Volcanology and Seismology (Phivolcs) ang pangamba hinggil sa muling pagsabog ng bulkang Taal kasunod ng magnitude 6.3 na lindol na yumanig sa Calatagan, Batangas pasado alas-7 Biyernes ng umaga.

Ayon kay PHIVOLCS director, Undersecretary Renato Solidum, maliit ang posibilidad na magkaroon ng epekto sa bulkan ang malakas na lindol bagaman patuloy pa nila itong inoobserbahan.

Binigyang-diin rin ni Solidum na sumabog na ang bulkan ngayong taon at malalim ang naramdamang lindol kaninang umaga.

Siguro pagdating doon sa fault baka wala, kasi hindi naman ito ganoon kalaki at malalim siya masyado. Pero pagdating sa Taal Volcano, kasi katatapos lang ng kanyang eruption, oobserbahan natin kung may epekto talaga ito,” ang pahayag ni Solidum.

“Titingnan natin kung magre-react ang Taal Volcano, pero dapat nating maaalala, matandaan, na nasa alert level 1 pa lang naman siya,” dagdag pa niya.

Magugunitang noong buwan ng Enero 2020 ay itinaas sa alert level 4 ang Taal matapos itong magbuga ng abo.

Sa ngayon ay nasa alert level 1 ang bulkan na ang ibig sabihin ay bahagyang pagtaas ng volcanic activity gaya ng gas o steam emission at mga pagyanig. Ipinagbabawal din ang pagpasok sa permanent danger zone ng bulkan.

Paliwanag ng ahensiya, gumalaw ang Manila trench kaya’t naramdaman ang pagyanig sa Metro Manila.

Tiniyak din ng PHIVOLCS na walang direktang epekto ang lindol sa Batangas sa West Valley Fault.

Bukod sa Metro Manila, Batangas at Laguna, naramdaman rin ang lindol sa ilang bahagi ng Rizal at Northern Luzon.

Magnitude 5.2 quake rattles parts of Davao Occidental

Robie de Guzman   •   December 25, 2020

MANILA, Philippines – A magnitude 5.2 earthquake rocked Davao Occidental on Friday, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported.

In its bulletin, PHIVOLCS said the temblor occurred at 10 a.m., 89 kilometers southeast of Sarangani town in Davao Occidental.

It was tectonic in origin and had a depth of 65 kilometers.

Instrumental Intensity II was felt at Alabel, Sarangani and Instrumental Intensity I was felt at Kiamba, Sarangani; Koronadal City; General Santos City.

PHIVOLCS said it is not expecting damage nor aftershocks due to the quake.

The state seismologists earlier reported a magnitude 6.3 quake that struck off Calatagan, Batangas at 7:43 a.m. Friday.

MRT-3, LRT-2 resume ops after Batangas quake

Robie de Guzman   •   December 25, 2020

MANILA, Philippines – The operations of the Metro Rail Transit line 3 (MRT-3) has resumed after it was momentarily halted due to the magnitude 6.3-earthquake that struck off Calatagan, Batangas at around 7:34 a.m. Friday and felt in Metro Manila.

In an advisory, the MRT-3 management said the railway operations resumed at 8:32 a.m. but at a slower speed of 50 kilometers per hour (kph) from 60kph at the mainline after checking of tracks.

“Checking of buildings and facilities is ongoing,” the MRT-3 said.

The railway management was forced to suspend train operations for minutes earlier and advised train drivers to stop at the nearest station for precautionary measures.  

Meanwhile, the management of the Light Rail Transit line 2 (LRT-2) said operations resumed around 11 a.m. after it was temporarily suspended due to the quake.

The temblor was also felt in nearby provinces, including Bulacan, Bataan, and Laguna.

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) said the quake was tectonic in origin and had a depth of focus of 109 kilometers.

The following intensities were recorded several areas: 

  • Intensity IV – Lemery, and Malvar, Batangas; San Pedro, Laguna; City of Manila; Marikina City; Quezon City; Cainta and Antipolo City, Rizal; Pasig City
  • Intensity III – Caloocan City; Tanay, Rizal; San Jose Del Monte City, and Plaridel, Bulacan; Gapan City, Nueva Ecija; Cabangan and Iba, Zambales; Samal,
  • Bataan; Valenzuela City; Malabon City
  • Intensity II – San Isidro, Nueva Ecija; Alaminos City, Pangasinan
  • Instrumental Intensities were also recorded:
  • Intensity IV – Bacoor City; Tagaytay City; Carmona, Cavite; Plaridel, Calumpit, San Ildefonso, San Rafael, and Malolos, Bulacan; Guagua, Pampanga; Puerto Galera, Oriental Mindoro; Las Pinas City
  • Intensity III – Talisay, Batangas; San Jose, Occidental Mindoro; Dagupan City; Quezon City; Pasig City; Muntinlupa City; Marikina City; Cabanatuan City
  • Intensity II – Roxas, Oriental Mindoro; Lucban, Quezon; Baler, Aurora; Palayan City
  • Intensity I – San Jose, Nueva Ecija; Gumaca, Lopez and Lucena City, Quezon

Phivolcs said there is no reported significant damage from the quake but it is expecting aftershocks.

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