Geohazard
Assessment of
Leyte Province
DOST - Nationwide Operational Assessment of Hazards
BACKGROUND
• Supertyphoon Yolanda (international name Haiyan)
• Tacloban City, Leyte
Yolanda’s typhoon path moving west north west
Location Map of Leyte Province.
Leyte is highlighted in red. Tacloban is highlighted in blue, while Eastern Visayas (Regio...
Tacloban Demographic Data

2012 Census of Population and Housing (CPH, 2013a)

Image of Tacloban and its surrounding munic...
Materials Used in Building the
Occupied Housing Units in Tacloban

Outer Walls
Materials Used in Building the
Occupied Housing Units in Tacloban

Roofing
Soil Map for Leyte
Province
STORM SURGE
SIMULATION
The JMA Storm Surge Model is a numerical model
developed by the Japan Meteorological Agency (JMA)
t...
Parameters for Storm Surge Modeling
Storm track
Maximum wind speed,
Central atmospheric pressure,
Bathymetry.
JMA Storm Surge Model of Yolanda
http://blog.noah.dost.gov.ph

Highest predicted storm surges for November 8, 2013 1:00 pm.
NOAA Comet Program Difference between a storm surge and storm tide.

NOAA Comet Program difference between a surge on a st...
Storm tide height for San Juanico Strait, Tacloban City
Storm Surge Hazard for North of Leyte (READY PROJECT)
Source: http://www.geoportal.gov.ph/ (5:01 PM – 09-25-13)
Rain-Induced Landslide Hazard Map for North of Leyte (source: MGB)
Source: http://www.geoportal.gov.ph/ (5:25 PM – 09-25-1...
SHALLOW LANDSLIDE
SUSCEPTIBILITY
SIMULATION
Shallow Landslide Susceptibility Map for North of Leyte
STRUCTURALLYCONTROLLED
LANSLIDE SIMULATION
Coltop3D – simulates a 3D model of the DEM showing the dip and dip direction
of...
Potential Rockslide Zones
of Tacloban City, Leyte
ALLUVIAL FAN AND
DEBRIS FLOW
SIMULATION
• Based from the apex of the alluvial

fan in the municipality of Kananga,
Leyte, a total of 13 barangays are at

a risk o...
Landslide Inventory
Map for Leyte
Province
Number of Landslides per Municipality
Tomas Oppus
Tacloban
St. Bernard
Sogod
Silago
Padre Burgos
Ormoc City
Merida
Matalom...
% Area Affected
Tomas Oppus
Tacloban
St. Bernard
Sogod
Silago
Padre Burgos
Ormoc City
Merida
Matalom
Malitbog
Mahaplag
Lil...
Inventory of Landslides in Leyte
Landslide Statistics
Map for Leyte
Province
SHALLOW LANDSLIDE
SUSCEPTIBILITY
SIMULATION
Shallow Landslide Susceptibility Map for North of Leyte
STRUCTURALLYCONTROLLED
LANSLIDE SIMULATION
Coltop3D – simulates a 3D model of the DEM showing the dip and dip direction
of...
Potential Rockslide Zones
of Tacloban City, Leyte
Portion of Leyte and Southern Leyte Potential Rockslide Zones
Saint Bernard, Hinunangan, Libangon and Liloan Potential Rockslide Zones
Guinsaugon Area Potential Rockslide Zones and Rock Mass Propagation Extent
Tacloban geohazard assessment report [11.28.13]
Tacloban geohazard assessment report [11.28.13]
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Tacloban geohazard assessment report [11.28.13]

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  • Supertyphoon Yolanda (international name Haiyan) made aninitial landfall in Guian, Eastern Samar then made its second landfall in Tacloban, Leyte at 0700H on November 7.It left a trail of devastation that resulted in 4,011 persons dead, 18,557 injured and 1,602 missing. It also inflicted a total damage of nearly PhP12.5 billion with PhP1.9 billion for infrastructures and PhP10.5 billion foragriculture NDRRMC.
  • Highlited in red is Leyte province (left) while highlited in yellow is Eastern Visayas Region VIII (right)
  • The poorly drained soils in Leyte are found in the following areas: low lying areas around Palo,Tanauan, and Alangalang (Pawing Series);and around the municipality of Palo, extending to the inner regions at the foot of the central Cordillera near Jaro and DagamiAlangalang and Barugo on the north and in Abuyog on the south (Palo Series). Pawing and Palo series developed from recent alluvial deposits and both have minimal soil prole development.The moderately drained at lowland soils belong to the soil series of San Manuel, Umingan, Dagami, Mandawe, and Bantog series. These soils are found in the following areas: Babatngon, Palompon, Hilongos; alluvial soil formation on Western Leyte from Ormoc to Baybay; in the municipality of Dagami; along the Hilongos and Bangerahan rivers; and in the municipality of Villaba. These soils developed from alluvial deposits, show moderate soil prole development, and have level to nearly level topography. These soils are mostly cultivated for agriculture.
  • The storm track is the path being followed by the center of the tropical cyclone.Wind speed is the rate of change of horizontal air in a given moment or amount of time.Bathymetry is the study of the oor beds of bodies of water or is simply described as the depth of ocean relative to the sea level.
  • Highlited in red is Leyte province (left) while highlited in yellow is Eastern Visayas Region VIII (right)
  • Blue= Rock mass propagation extentRed=Potential Rockslide Zones
  • Tacloban geohazard assessment report [11.28.13]

    1. 1. Geohazard Assessment of Leyte Province DOST - Nationwide Operational Assessment of Hazards
    2. 2. BACKGROUND • Supertyphoon Yolanda (international name Haiyan) • Tacloban City, Leyte
    3. 3. Yolanda’s typhoon path moving west north west
    4. 4. Location Map of Leyte Province. Leyte is highlighted in red. Tacloban is highlighted in blue, while Eastern Visayas (Region VIII) is in yellow.
    5. 5. Tacloban Demographic Data 2012 Census of Population and Housing (CPH, 2013a) Image of Tacloban and its surrounding municipalities
    6. 6. Materials Used in Building the Occupied Housing Units in Tacloban Outer Walls
    7. 7. Materials Used in Building the Occupied Housing Units in Tacloban Roofing
    8. 8. Soil Map for Leyte Province
    9. 9. STORM SURGE SIMULATION The JMA Storm Surge Model is a numerical model developed by the Japan Meteorological Agency (JMA) to simulate and predict storm surges mainly caused by tropical cyclones.
    10. 10. Parameters for Storm Surge Modeling Storm track Maximum wind speed, Central atmospheric pressure, Bathymetry.
    11. 11. JMA Storm Surge Model of Yolanda
    12. 12. http://blog.noah.dost.gov.ph Highest predicted storm surges for November 8, 2013 1:00 pm.
    13. 13. NOAA Comet Program Difference between a storm surge and storm tide. NOAA Comet Program difference between a surge on a steep seafloor and gently-sloping seafloor.
    14. 14. Storm tide height for San Juanico Strait, Tacloban City
    15. 15. Storm Surge Hazard for North of Leyte (READY PROJECT) Source: http://www.geoportal.gov.ph/ (5:01 PM – 09-25-13)
    16. 16. Rain-Induced Landslide Hazard Map for North of Leyte (source: MGB) Source: http://www.geoportal.gov.ph/ (5:25 PM – 09-25-13)
    17. 17. SHALLOW LANDSLIDE SUSCEPTIBILITY SIMULATION
    18. 18. Shallow Landslide Susceptibility Map for North of Leyte
    19. 19. STRUCTURALLYCONTROLLED LANSLIDE SIMULATION Coltop3D – simulates a 3D model of the DEM showing the dip and dip direction of its different discontinuity sets. Matterocking - computes and estimates the locations where rock instabilities can occur based on the identified discontinuity sets that allow sliding
    20. 20. Potential Rockslide Zones of Tacloban City, Leyte
    21. 21. ALLUVIAL FAN AND DEBRIS FLOW SIMULATION
    22. 22. • Based from the apex of the alluvial fan in the municipality of Kananga, Leyte, a total of 13 barangays are at a risk of debris flows.
    23. 23. Landslide Inventory Map for Leyte Province
    24. 24. Number of Landslides per Municipality Tomas Oppus Tacloban St. Bernard Sogod Silago Padre Burgos Ormoc City Merida Matalom Malitbog Mahaplag Liloan Libagon Kananga Hinunangan Hindang Dagami Bontoc Albuera Alangalang Abuyog 0 5 10 15 20 25
    25. 25. % Area Affected Tomas Oppus Tacloban St. Bernard Sogod Silago Padre Burgos Ormoc City Merida Matalom Malitbog Mahaplag Liloan Libagon Kananga Hinunangan Hindang Dagami Bontoc Albuera Alangalang Abuyog 0 5 10 15 20 25 30
    26. 26. Inventory of Landslides in Leyte
    27. 27. Landslide Statistics Map for Leyte Province
    28. 28. SHALLOW LANDSLIDE SUSCEPTIBILITY SIMULATION
    29. 29. Shallow Landslide Susceptibility Map for North of Leyte
    30. 30. STRUCTURALLYCONTROLLED LANSLIDE SIMULATION Coltop3D – simulates a 3D model of the DEM showing the dip and dip direction of its different discontinuity sets. Matterocking - computes and estimates the locations where rock instabilities can occur based on the identified discontinuity sets that allow sliding
    31. 31. Potential Rockslide Zones of Tacloban City, Leyte
    32. 32. Portion of Leyte and Southern Leyte Potential Rockslide Zones
    33. 33. Saint Bernard, Hinunangan, Libangon and Liloan Potential Rockslide Zones
    34. 34. Guinsaugon Area Potential Rockslide Zones and Rock Mass Propagation Extent

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