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PIA Press Release
2010/01/26

Gov't bares most common geohazards in Region 8

Tacloban City (January 26) -- In order to make the various local disaster coordinating councils and the public in general, aware of the most common geohazards which Region 8 is prone to, the Regional Disaster Coordinating Council in Eastern Visayas disclosed the areas as to where the geohazards may sow havoc.

The most common geohazards which may fall in Region 8 are landslides, flooding or flash floods, coastal erosion and earthequakes. The other hazards are volcanic eruption, liquefaction and tsunami.

Director Angel Gaviola of the Office of Civil Defense who presided over the emergency meeting of the Regional Development Council of Eastern Visayas recently, told the body that it is a must that all local disaster coordinating councils are aware of the hazards their areas are prone to, so that they will be able to prepare for any eventuality.

The most prone to landslide areas are the hilly areas of Maasin City, Southern Leyte; the upland and mountainous portions of Ormoc City and Isabel, Leyte; the mountainous portions of Sogod, Southern Leyte; the coastal section of Abuyog, Leyte; and the rock formations of Catbalogan, Samar.

Landslide

In the province of Leyte, about thirty three 33 out of the 41 municipalities are susceptible to landslide. These are the municipalities of Abuyog, Albuera, Bato, Baybay, Burauen, Calubian, Capoocan, Carigara, Dagami, Hilongos, Hindang, Inopacan, Jaro, Javier, Kananga, La Paz, Leyte, Mac Arthur, Mahaplag, Matag-ob, Matalom, Merida, Ormoc City, Palompon, San Isidro, Sta. Fe, Villaba, Palo, Babatngon, San Miguel, Tabangon, and Tacloban City,

Of the 1,366 barangays in the province of Leyte, about 602 are susceptible to landslide; with 117 barangays found to be highly susceptible, 240 barangays have moderate susceptibility; and 245 barangays have low susceptibility to landslide.

In the province of Southern Leyte, all the 18 municipalities and one city therein are susceptible to landslide, namely, Maasin City, Silago, Hinunangan, Hinundayan, Anahawan, San Juan, St. Bernard, Liloan-Panaon Island, San Francisco-Panaon Island, San Ricardo-Panaon Island, Pintuyan-Panaon Island, Libagon, Sogo, Bontoc, Tomas Oppus, Malitbog, Padre Burgos, Macrocohon, and Limasawa.

Of the 497 barangays in the province of Southern Leyte, 469 are susceptible to landslide. Highly susceptible are 104 barangays, moderately susceptible are 142 barangays and with low susceptibility are 208 barangays. Only 28 barangays are not susceptible to landslide.

All the 8 municipalities in the province of Biliran, namely, Naval, Kawayan, Almeria, Culaba, Caibiran, Cabucgayan, Biliran, Maripipi Island, are susceptible to landslide. About 109 of the 132 total barangays in the province are susceptible. About 18 barangays have high susceptibility; 45 barangays with moderate susceptibility, and 34 barangays have low susceptibility.

In the municipality of Borongan, Eastern Samar, out of the 61 barangays, there are 39 which are prone to landslide with 8 highly susceptible, 17 moderately susceptible and 14 barangays have low susceptibility.

Of the 353 barangays in Eastern Samar, 170 are prone to landslide. About 39 are highly susceptible, 58 are moderately susceptible while 70 have low susceptibility.

Meanwhile, of the 281 barangays in Northern Samar, about 277 have been assessed to be prone to landslide. About 39 are highly susceptible, 77 are moderately susceptible and 61 have low susceptibility.

Flooding/Flash floods

For the areas susceptible to flooding, 33 municipalities and cities in the province of Leyte are susceptible, namely, Jaro, Pastrana, Dagami, Tanauan, Palo, Carigara, Barugo, San Miguel, Jaro, Tunga, Alangalang, Sta. Fe, Burauen, Julita, Dulag, Mayorga and part of La Paz, MacArthur, Javier, Abuyog, Merida, Isabel, Palompon, Villaba, Tabango, Leyte, Matalom, Hilongos, Inopacan, Baybay, Albuera, Ormoc and Tacloban City.

In the province of Southern Leyte, 9 municipalities and city are susceptible to flooding or flash floods. They are Silago, Hinunangan, Cabalian, St. Bernard, San Francisco, Sogod, Bontoc, Malitbog, Macrohon, and Maasin City; while in the province of Biliran, the municipalities of Biliran and Cabugcayan, Caibiran, Kawayan and Naval are prone to flooding.

For Samar, the 3 municipalities which are prone to flooding are Gandara, Calbiga and Basey. In Eastern Samar, the 4 municipalities which are prone to flooding are Oras, Dolores, Can-avid, Taft, and Llorente.

In Northern Samar, the 5 municipalities which are prone to flooding are Catarman, Pambujan, San Roque, Laoang, and Mondragon.

Coastal Erosion

Coastal erosion is a kind of geohazard that extensively affect the eastern side of Leyte Island.

Recent studies conducted by the geologists of MGB-RO8 disclosed that the intense removal of beach sediment material could affect the coastal area from Tacloban City, Leyte in the north to as far as Silago, Southern Leyte in the south.

On Coastal Erosion, the most seriously affected coastal area is at Barangay San Roque, Tanauan, Leyte. Here, a significant portion of beach area is already considerably eroded or washed out due to the wave induced movement of beach material moving northward. An old shoreline sand spit in the area has already been washed-out.

Earthquake

Thirteen municipalities and cities of Leyte are prone to earthquake as they are within the 25 km wide danger zone along the Philippine Fault zone. These are Leyte, Carigara, Kananga, Capoocan, Jaro, Tunga, Ormoc City, Albuera, Burauen, Baybay, Burauen, Abuyog, and Mahaplag.

In Southern Leyte, 17 out of 18 municipalities are prone to earthquake. These are Silago, Sogod, Libagon, Hinunangan, Bontoc, Tomas Oppus, Malitbog, Padre Burgos, Limasawa, St. Bernard, San Juan, Hinundayan, Anahawan, Liloan, San Francisco, Pintuyan, and San Ricardo.

In the province of Biliran, the 6 municipalities which are prone to the earthquake hazard are Naval, Biliran, Cabucgayan, Kawayan, Almeria, and Maripipi.

Those under the North North East Splay Fault from the Philippine Fault Zone are Malitbog, Maasin City, Bontoc and Tomas Oppus in Southern Leyte.

The areas which will be affected because they are parallel North West Faults to the Philippine Fault Zone are Tacloban City, Babatngon, San Miguel, Sta. Fe, Palo, Tanauan, and Tolosa in Leyte; Calbayog City, Catbalogan, San Sebastian in Samar and Giporlos, and Can-avid in Eastern Samar.

Volcanic Eruption

Maripipi, Kawayan in Biliran province and San Juan in Southern Leyte are prone to volcanic eruptions.

Tsunami

On the other hand, the west dipping subduction zone is more commonly known as the Philippine trench, a portion of the well-known Philippine deep. It is estimated to be located about 60 kilometers from the eastern coast of Eastern Samar and generally trends approximately north-northeast.

The areas to be affected in case of tsunami occurrence are Calbayog City, Catbalogan, San Sebastian in Samar; Catarman and low-lying municipalities in Northern Samar; the whole of Eastern Samar since it is fronting the Philippine Trench; and the coastal villages of Panaon Island in Southern Leyte.

Liquefaction

The areas which will be affected in case of liquefaction are Alangalang, Pastrana, Dagami, Sta. Fe, Tabontabon, Dulag, Tolosa, Tanauan, San Miguel, and Tacloban City, in the province of Leyte. (PIA 8) [top]

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