Public may ask PHIVOLCS if their area is transected by fault line
admin • June 3, 2015 • 4503
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: email@example.com; firstname.lastname@example.org Telephone: +632 426 1468 to 79 Fax: +632 929 8366, 927 4524 Official Website: http://www.phivolcs.dost.gov.ph
MANILA, Philippines — Mount Kanlaon in Negros Island is one of the most active volcanoes in the country similar to Mt. Pinatubo in Zambales, Mt. Mayon in Albay, Mt. Bulusan in Sorsogon, and Mt. Hibok-Hibok in Camiguin Island.
Based on the observation of the Philippine Institute of Volcanology and Seismology (PHIVOLCS), the volcano has recorded abnormal activities especially last Sunday (June 21) and Monday (June 22).
Earthquakes have been felt as the volcano spewed ashes.
Department of Science and Technology (DOST) Undersecretary and PHIVOLCS OIC Renato Solidum explained these activities may be attributed to an existing fault.
They are now observing if the tremors will move under the summit.
“Itong pagkilos ng fault ay posibleng sanhi dahil sa pag pressurize ng lugar sa Kanlaon volcano ng hydrothermal fluids o pagpapakulo ng tubig o di kaya ay mas malalim pang magmatic activity,” Solidum noted.
Most of the Kanlaon’s explosions were phreatic, the agency observed.
Based on studies of rock samples from the volcano, its last lava episode was in the early 1900’s.
In the 1996 eruption, three persons who went up the volcano died.
Usec. Solidum said Mt. Kanlaon is not comparable with the Taal Volcano when it comes to activities, though a major eruption is possible.
Alert Level 1 has been raised over Mt Kanlaon since March this year.
“Kung ang tanong mo ay mabilis yung escalation, wala tayong nakikitang ganung history sa Kanlaon based on record history (We didn’t have any record of rapid escalation based on Kanlaon’s record in history),” Solidum said.
“Pero yung posibilidad ng magkaroon ng mas malakas na eruption ay nandoon katulad ng Mayon Volcano; not Taal Volcano, hindi naman sila pareho ng setting (But there is the possibility of a major eruption like with Mount Mayon, but unlike Taal Volcano. Their settings are different),” he added.
PHIVOLCS warned that entering the four-kilometer permanent danger zone is strictly prohibited. MNP (with reports from Rey Pelayo)
Inihahanda na ng pamahalaan ng La Carlota City sa Negros Occidental ang disaster management plan na ipatutupad sakaling lumala ang ipinakikitang abnormalidad ng Mount Kanlaon.
Ayon kay La Carlota City Mayor Rex Jalando-on, nakapaloob sa kanilang plano ang pagtukoy sa mga barangay na lubos na maapektuhan at kailangang ilikas sakaling sumabog ang bulkan o kaya ay mas tumindi pa ang nararanasang pagyanig sa paligid ng bulkan.
Nakapaloob rin sa disaster management plan ang gagamiting logistics, transportation at available resources, pati na ang positioning ng food packs at mga lugar na maaaring gamiting temporary shelter ng mga ililikas na residente.
Tiniyak rin ni Jalando-on na mayroong P10 milyong quick response fund na maaaring gamitin ang lokal na pamahalaan.
Nagsasagawa na rin sila ng kampanya upang paalalahanan ang mga residente na maghanda at maging alerto sa gitna ng nararanasang pagyanig sa kanilang lungsod.
May gagawin ring drill upang malaman ng mga residente ang mga dapat gawin kapag nakaranas ng malakas na lindol o kaya ay sumabog ang bulkan.
Bahagya ring humina ang inilalabas na puting usok ng bulkan na umabot sa taas na 300 metro.
Iniulat rin ng PHIVOLCS ang patuloy na deflation sa ibabang bahagi ng bulkan at inflation o paglobo naman sa gitnang dalisdis na nangangahulugan umano ng hydrothermal o magmatic activity sa ilalim ng lupa.
Muli ring nagpa-alala ang ahensiya na nasa alert level 1 ang Mount Kanlaon na ang ibig sabihin ay nagpapakita ito ng abnormal na aktibidad at nasa “period of unrest.”
Naka-deklarang permanent danger zone ang four-kilometer radius ng bulkan at ipinagbabawal ang pagpasok rito ng mga tao.
Sakop naman ng eight-kilometer radius ng bulkan ang mga Barangay ng Ara-ala at Yubo kaya’t mahigpit itong binabantayan ng lokal na pamahalaan. – RRD (mula sa ulat ni Correspondent Lalaine Moreno)
MANILA, Philippines – The Philippine Institute of Volcanology and Seismology (Phivolcs) on Thursday said it has downgraded the alert on Taal Volcano to level 1 following the decrease in volcanic quakes and surface activity at the main crater.
In its bulletin, Phivolcs said the Taal Volcano’s condition in the succeeding four weeks after its alert was lowered to level 2, has been characterized by low-level volcanic earthquake activity, stabilizing ground deformation of the Taal Caldera and the Taal Volcano Island edifices, and weak surface activity at the Main Crater and the Daang Kastila fissure.
“DOST-PHIVOLCS is lowering the alert status of Taal Volcano from Alert Level 2 to Alert Level 1 to reflect the overall decreasing trend in the level of monitoring parameters,” its bulletin reads.
State volcanologists said that alert level 1 means that the volcano is still in “abnormal condition,” and that this “should not be interpreted that unrest has ceased or that the threat of an eruption has disappeared.”
Under alert level 1, sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within the Taal Volcano Island.
The alert level may be raised back to alert level 2 “should pronounced change in monitored parameters forewarn of renewed unrest,” Phivolcs said.
The agency reminded residents that entry to Taal’s permanent danger zone, especially the vicinities of the Main Crater and the Daang Kastila fissure, remains strictly prohibited.
The Taal Volcano was placed under alert level 4 when it spewed ash on January 12 which sent thousands of residents to temporary shelters and disrupted businesses in surrounding areas.
It was later lowered to alert level 2 several weeks later due to decreased unrest. — ROBIE DE GUZMAN
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