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Philippine Institute of Volcanology and Seismology, Powered by Joomla!
Tuesday, 30 May 2017 12:54

Mati City, Davao Oriental, Philippines, 30 May 2017

The Philippine Institute of Volcanology and Seismology – Department of Science and Technology (PHIVOLCS-DOST) is conducting a series of 1-day seminar-workshops on Earthquake Awareness and Preparedness for Local Government Units (LGUs) and Barangay Officials of Davao Oriental. The seminar-workshop will be held on May 30, 31, and June 1, 2017 at Honey’s Hotel and Restaurant, Mati City.

The province of Davao Oriental was identified as an earthquake and tsunami prone area. It is transected and bounded by active earthquake generators such as the Philippine Fault and the Philippine Trench. The tsunami threat posed to the eastern Philippine archipelago includes both local and distant tsunamis. Large-magnitude earthquakes that also generated a tsunami have occurred in the region.

The one-day seminar-workshop aims to strengthen the province’s awareness about earthquake and tsunami, as well as to help them prepare in case such natural hazards occur in the region. LGUs and Barangay Officials’ role in correct information dissemination will be discussed in the seminar-workshop.

PHIVOLCS, thru the Provincial Government of Davao Oriental, invited participants from the municipalities of Boston, Cateel, Baganga, and Caraga to attend on May 30. Officials from the municipalities of Manay, Tarragona, BanayBanay, and Lupon and municipalities of San Isidro, Governor Generoso, and Mati City are expected to attend the seminar on May 31 and June 1, 2017, respectively.

In addition, PHIVOLCS will conduct a press conference, PHIVOLCS Infosentro, to give update regarding the recent earthquakes at Honey’s Restaurant on May 31, 2017, and on June 1, Usec. Renato Solidum will be the guest speaker in “Kapihan sa Apo View” at Apo View Hotel, Davao City.

Last year, PHIVOLCS conducted a “Teachers’ Training on Communicating Earthquake and Tsunami Hazards” for elementary teachers from the Division of Mati and District of Manay, Division of Davao Oriental last October 12 and 13, 2016 at Honey’s Hotel and Restaurant, Mati City, Davao Oriental.


[Download Press Release Here]



For information about the event, please contact:

Dr. Renato U. Solidum, Jr.

Undersecretary for Disaster Risk Reduction and Climate Change, DOST

and Officer-in-Charge, PHIVOLCS

Wednesday, 12 April 2017 17:53

12 April 2017

What is happening in Lanao del Sur?

At 5:21 AM on 12 April 2017, Wednesday, a moderate earthquake of magnitude 6.0 shook the island of Mindanao. The epicenter is located 13 km northwest of Wao, Lanao del Sur at a depth of 1 km.  The earthquake was generated by the movement of a northwest trending active fault in the area. Small-magnitude earthquakes followed afterwards, and as of 3:00 PM of 12 April 2017, 73 aftershocks have been recorded by PHIVOLCS seismic monitoring network.

Based on preliminary intensity reports, the strongest ground shaking was felt at PHIVOLCS Earthquake Intensity Scale (PEIS) VII (Destructive) in Wao, Lanao del Sur and Kalilangan, Bukidnon. Furthermore, it was felt at PEIS VI (Very Strong) in Amai Manabilang, Lanao del Sur;  PEIS V (Strong) in Pangantukan, Bukidnon, and Banisilan, Cotabato.  It was also felt at PEIS IV in Cagayan de Oro City, Iligan City, Cotabato City, Gingoog City in Misamis Oriental, Matalam in North Cotabato, Valencia and Maramag in Bukidnon, and Davao City. This was felt at PEIS III to I in Kabacan and Arakan in North Cotabato, Quezon and Don Carlos in Bukidnon, Pikit in Cotabato, Lebak in Sultan Kudarat, Kidapawan City, Koronadal City, and Mambajao in Camiguin. Damages to some buildings and roads due to strong ground shaking were reported near the epicentral area. Landslides were also reported in Amai Manabilang (Bumbaran). At the time of writing, there are no reports of casualties.

Large magnitude earthquake has affected Lanao del Sur in the past!

On April 1, 1955, a magnitude 7.5 earthquake was experienced in Lanao area. This earthquake, which is considered to be one of the most damaging historical earthquakes in Lanao del Sur, resulted to about 400 deaths. Strong ground shaking was also felt during this event, resulting to significant damage to infrastructures including a mosque in Tugaya municipality near Lake Lanao. Several houses also collapsed and wharfs were damaged in Zamboanga City and Pagadian City. Liquefaction and landslides were also documented.

Aside from this, several small to moderate earthquakes have also been recorded within the province, with intensities ranging from PEIS IV to VII.

Continue reading..
Tuesday, 11 April 2017 14:14

11 April 2017

What is happening at Batangas Province?

A phenomenon called earthquake swarm is currently happening at Batangas.  An earthquake swarm is a burst of earthquake activity clustered in a specific area in a short period of time due to movement of a fault. The Batangas swarm started on 4 April at 8:58 PM, and is still ongoing to date.

Large-magnitude earthquakes have also affected Batangas in the past!

At least six large earthquakes had affected Batangas province – the Mindoro earthquakes of November 15, 1994, April 9, 1942, and May 26, 1889, and the earthquakes of April 26, 1972, October 1, 1869, and September 16, 1852 whose epicenters were located in West Philippine Sea. The 1994 Magnitude 7.1 Mindoro Earthquake was felt at intensity VII in the epicentral areas and may have shaken Batangas at intensities of V to VI or even VII while the 1889 Magnitude 6.4 Earthquake was felt at Intensity VI-VII in Mindoro and Batangas. The 1852 Magnitude 7.6 and 1869 Magnitude 6.6 offshore events were reportedly felt at Intensity VII in and around Batangas. Although there were no accounts of direct damage in Batangas due to the 1994, 1972, and 1942 events, the 1852, 1869 and 1889 events damaged several buildings and infrastructures in the area.

Why do earthquakes occur at Batangas?

Batangas is one of the seismically active areas in the Philippines.  Instrumental monitoring of earthquakes for the past century has detected many small to large-magnitude earthquakes near Batangas generated by the Manila Trench and Lubang Fault.  The Manila Trench is an earthquake generator located offshore west of Luzon Island, roughly parallel to the Philippine archipelago in the north but veers very close to land at the southern tip of Occidental Mindoro.  Another offshore earthquake generator is Lubang Fault, located between Mindoro Island and Batangas, which is also the locus of small to large-magnitude earthquakes.  Other active faults on land are present in Southern Luzon, such as the Valley Fault System and the Philippine Fault. The current series of earthquakes in Batangas can be attributed to the movement of an unnamed local fault in the vicinity of the Tingloy-Mabini area.

Can these present earthquakes indicate volcanic activity?

No. Although Taal Volcano is located approximately 30 kilometers from Mabini, Batangas, the present network of instruments located in and around Taal Volcano shows no indication of any significant change of monitoring parameters suggesting renewed magmatic activity. However, as part of PHIVOLCS’ monitoring procedures for moderately large earthquakes occurring near active volcanoes, the institute will closely monitor this earthquake events in relation to any activity that may be monitored in Taal Volcano.

Can these recent earthquake events trigger a destructive tsunami?

No. The magnitude is not big enough to generate a destructive tsunami.

Can human activity such as geothermal drilling, blasting, etc.  trigger large earthquakes along active faults?

No. Hypocenters of moderate- to large-magnitude earthquakes along active faults are too deep to be influenced by any human activity.

What can we expect from the current earthquake activity?

Small to moderate magnitude earthquake events can still occur in the following days to weeks.

What should we do?

The best course of action is preparedness – the damaging effects of earthquakes can be minimized if we prepare ourselves for the event.  Because a large-magnitude earthquake, either from active faults in Luzon or the Manila Trench may affect Batangas as a whole, it is always prudent to prepare for such an eventuality.

What can we expect in the event of a large-magnitude/high-intensity earthquake?

Strong ground shaking may cause extensive damage to, or even the collapse of houses, buildings, bridges, and other infrastructures.  Collapsed structures usually account for most of the casualties during a strong earthquake.  Falling objects may also cause injuries.

Aside from strong ground shaking, what other seismic hazards are life threatening?

Landslides, rock falls, and other types of mass movements may occur in mountainous or hilly areas.  Liquefaction manifested by sandboils or lateral spreading may affect low-lying, waterlogged, sandy areas near the coast or at the banks of rivers.

What is the role of PHIVOLCS?

PHIVOLCS operates and maintains a network of 93 seismic stations spread across the Philippines. Twelve of these seismic stations are located in or around Batangas. Four of which are staffed-controlled located in Puerto Galera, Tagaytay, and Lucban and Guinayangan in Quezon and seven are remote seismic stations located in Lubang and San Jose in Mindoro, Busuanga and Cuyo in Palawan, Romblon, Marinduque and San Andres in Quezon.  Data from the seismic stations are used to determine the locations of earthquakes, as well as the characteristics of the earthquakes generated. We also have a volcano monitoring network in and around Taal that could record seismic activity.

Aside from monitoring the occurrences of earthquakes, PHIVOLCS also conducts hazards analyses and assessment, and makes this information available to the public.  PHIVOLCS works hand-in-hand with other government agencies in mitigating the damaging effects of earthquakes.

Please visit our website at http://www.phivolcs.dost.gov.ph for earthquake bulletins, volcano updates, and other information on earthquakes and volcanoes.

Saturday, 08 April 2017 10:00

Ang PHIVOLCS-DOST ay hindi nagbibigay ng prediksyon patungkol sa lindol.

Para sa karagdagang impormasyon, bisitahin ang OPISYAL NA PHIVOLCS-DOST WEBSITE:

(www.phivolcs.dost.gov.ph), Facebook (www.facebook.com/PHIVOLCS) at Twitter (@phivolcs_dost).

PAKIUSAP, HUWAG magpadala o mag-forward ng anumang impormasyon na maaaring lalong makadagdag sa pagkalito at pagkatakot ng mga makakabasa nito.

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