Phil Hazard Presentation

Geohazards in the Philippines

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South Chjna Sea

Philippine Sea

Philippine Archipelago

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South Chjna Sea

Philippine Sea

Philippine Archipelago

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The Philippines generally has a rugged terrain with over 60% of its land consisting of slopes.

Central Cebu

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The country lies along the path of air streams (e.g NE and SW monsoons) and several tropical stroms.

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Philippines: A Geohazard-Prone Country

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Hazards

Geologic Hazard Fault-related / seismic hazards Mass movement Volcanic hazards

Hydrologic Hazard Fluvial / riverine Coastal

ground rupture ground acceleration liquefaction differential settlement landslides fault creep lateral spread tsunami seiches

Geologic HazardsFault related /

Seismic hazards

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Dalton Pass,Digdig, N. Vizcaya

Imugan Rivernear Digdig, N. Vizcaya

Awaji Island, Japan(Kobe 1995 earthquake)

Pasig, Philippines

ground rupture ground acceleration liquefaction differential settlement landslides fault creep lateral spread tsunami seiches

Geologic HazardsFault related / Seismic hazards

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ground rupture ground acceleration liquefaction differential settlement landslides fault creep lateral spread tsunami seiches

Geologic HazardsFault related / Seismic hazards

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Baguio Park Hotel

Central Luzon State University Library

San Jose, N. EcijaResidential Bldg.

Umingan, Pangasinan

ground rupture ground acceleration liquefaction differential settlement landslides fault creep lateral spread tsunami seiches

Geologic HazardsFault related / Seismic hazards

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Dagupan, Pangasinan

Geologic HazardsMass Movement

Landslides

Fall Topple Slump Slide Spread Flow Complex March 2001

Artist’s perspective of a bridgeto cross slide area

Mahaplag, S. Leyte, August 1999

sliding mass

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Geologic HazardsUUUUUU GGGGGG SSSSSS

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Creep in Mankayan

Mass MovementLandslides

Fall Topple Slump Slide Spread Flow Complex

Geologic HazardsMass Movement

Landslides

Fall Topple Slump Slide Spread Flow Complex

Cherry Hills Landslide Incident

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August 1999August 1999

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Collapsed section of the Cebu TransCetral Highway

Geologic Hazards

Mass MovementLandslides

Fall Topple Slump Slide Spread Flow Complex

June 13 , 1991

Geologic HazardsVolcanic Hazards

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July 1994

September 1995

June 1991

Geologic HazardsVolcanic Hazards

ash fall pyroclastic surge lava flow debris flow debris avalanche pyroclastic flow bombs and ballistics lahar lateral blast tsunami volcanic earthquake flooding UUUUUU GGGGGG SSSSSS

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Geologic HazardsVolcanic Hazards

ash fall pyroclastic surge lava flow debris flow debris avalanche pyroclastic flow bombs and ballistics lahar lateral blast tsunami volcanic earthquake flooding

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Lahar flows in Abacan River, Pampanga

Tilted HouseSan Pedro, Laguna

Geologic Hazards Creep Subsidence Settlement

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Hydrologic HazardsFluvial

scouring bank erosion sedimentation channel erosion

Flooding (overflow) flooding (sheet flow) rill erosion gully erosion

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Sta Barbara, Iloilo

Hydrologic HazardsCoastal

Coastal erosion flooding storm surge coastal subsidence sea level rise tsunami submarine landslide

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An eroding coast noted in Cavite

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Seawall built along the Cavite coast

Hydrologic HazardsCoastal

Coastal erosion flooding storm surge coastal subsidence sea level rise tsunami submarine landslide

MGB’s ACTION TO MITIGATE GEOHAZARDS

DAO 2000-28DAO 2000-28Signed 14 March 2000Signed 14 March 2000

Published 08 April 2000Published 08 April 2000

To adequately and comprehensively address and mitigate the possible effects/ impacts of geologic hazards, it is hereby required that, in addition to the requirement for the issuance of an Environmental Compliance Certificate (ECC) as provided for under Presidential Decree No. 1586, Presidential Proclamation No. 2146 and its implementing rules and regulations, all proponents of subdivision development projects, housing projects and other land development and infrastructure projects, private or public, shall undertake an Engineering Geological and Geohazard Assessment.

1. Implementation of DAO 2000-28

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Activities Undertaken in Compliance With DAO 2000-28

Geological Site Scoping

Cavite Coast

C5 near Kalayaan Avenue UUUUUU GGGGGG SSSSSSLLLLLL

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Geological Verification

Activities Undertaken in Compliance with DAO 2000-28

Taytay, Rizal UUUUUU GGGGGG SSSSSSLLLLLL

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Activities Undertaken in Compliance with DAO 2000-28

Geological Review of EGGAR

Submitted to MGB

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MGB’s ACTION TO MITIGATE GEOHAZARDS

2. Conduct of Geohazard Assessment Especially in Areas Already Developed

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MGB’s ACTION TO MITIGATE GEOHAZARDS

Geohazard Assessment

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MGB’s ACTION TO MITIGATE GEOHAZARDS

3.Production of Thematic / Geohazard Maps

3.

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DDDDDDURBAN GEOLOGY SECTION

LANDS GEOLOGICAL SURVEY DIVISIONMINES & GEOSCIENCES BUREAU - CO