Geohazards
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Department of Environment and Natural Resources Mines and Geosciences Bureau
Geohazard Mapping and Assessment Programme
NDCC December 2, 2009
Outline Overview of Natural Hazards in the
Philippines Mines and Geosciences Bureau – DENR Geohazard Mapping Programme
and
Major Issues and Concerns
Assessment
Overview of Natural Hazards in the Philippines The geographic and geologic setting of the Philippines (part of Pacific Ring of Fire and Earthquake Belt) \make it prone to various hazards, including: •typhoon/rain-related •volcano-related •earthquake-related •tsunami
Why are we hazard-prone? Numerous active Faults and Trenches
Pinatu Pinatubo bo
Ea Lu st Tro z on ug h
Manila Trench
Didica Didicass
Ph i lipp ine Taal Taal Fau lt os gr ch Ne ren T
ch ren T u Sul
Mayon Mayon Bulusa Bulusann
Kanla Kanlaon on
C o Tr tab en at ch o
Ph ilip pin eT ren ch
Parke Parkerr
Numerous volcanic belts and active volcanoes Generally mountainous terrane and steep slopes Numerous typhoons and extended rainy seasons/periods Strong and shifting wave currents
Exacerbated by…. Silted rivers and, in urban areas, clogged waterways Deforested and denuded forests POOR SITE SELECTION OF SETTLEMENT SITES!
Philippines: Along the Typhoon Belt
• ~ 20 tropical cyclones per year enter Philippine Area of Responsibility • ~ 9 cross the country per year • heavy rains related to many weather systems – ex. typhoon, moonsoon, coldfront
Why are we hazardGen. Nakar & Real, Quezon prone? Baguio City, 1990
St. Bernard, So. Leyte
Mt. Pinatubo, 1991
Geohazard Mapping and Assessment Programme The Geohazard Mapping and Assessment Program is an on-going priority undertaking of the Department of Environment & Natural Resources (DENR) being implemented by the Mines & Geosciences Bureau (MGB). Its main objective is to identify areas in the country that are susceptible or vulnerable to various geologic hazards (GEOHAZARDS), and increase public awareness in order to lessen or mitigate the negative impacts of these events.
Components of the program
1) Remote Sensing analysis
3) Data integration and processing (GIS)
5) Information Dissemination
2) Field mapping and assessment
4) Geohazard Map Production
Data processing and integration (GIS platform): An example
GEOHAZARDS MAP
= Topographic Map
+
Vegetation map
+
Drainage map
+
Geomorphic map
+
Slope map
+
Geologic map
HIGH SUSCEPTIBILITY - Presence of active/recent landslides - Large tension cracks that would affect the community - Areas w/ drainages that are prone to landslide damming - Steep slopes (21-55% gradient) POSSIBLE ACCUMULATION ZONE MODERATE SUSCEPTIBILITY
areas likely to be affected by transported landslide materials
•Areas with inactive & old landslides •Small tension cracks are located away from the community •moderately steep slopes (15-30%) •Small, shallow landslides (< 1.0 m vertical displacement)
LOW SUSCEPTIBILITY • gently sloping to sloping (5-15%) terrain • absence of tension cracks.
WHERE ARE WE NOW? •
•
Geohazards mapping and assessment of some 1,348 municipalities out of 1,618 total or 82% of the country Coastal hazards mapping has covered roughly 2,385 line kilometers of coastal areas –
The priority provinces of the eastern seaboard and other critical areas completed include Surigao del Norte Surigao del Sur, Aurora, So. Leyte, Rizal, Cavite, Quezon, Ilocos Norte, Leyte, Isabela, Cagayan, Davao Del Sur, Compostela Valley, Ilocos Sur, and the Bicol Provinces
DENR-MGB GEOHAZARD MAPPING STATUS OF ACCOMPLISHMENTS 2009
Year
Target
Accomplishment
Total
Percentage of Total Country
2010
Pre2006
2006
2007
2008
-
450
250
250
275
486
291
249
112
(138)
(132)
275
696
987
1,236
1,348
1,486
1,618
16.8%
42.5%
60.4%
75.6%
82.4%
90.9%
100%
As of June
End of Dec
250
End of June
132
STATUS OF GEOHAZARD MAPS PRODUCTION
Total Quadrangles 970
86% geohazard maps produced in digital and hardcopy printouts
WHAT WE ARE DOING NOW
ONGOING ACTIVITIES
•
On-going geohazards mapping and assessment in various areas of the country –Presently carrying out the geohazards assessment of Bukidnon, Misamiz Oriental and Lanao del Norte –Assessment work of areas identified as possible relocation sites for people affected by recent natural hazards and other critical areas that may be affected in the future.
MAKING PEOPLE EQUIPPED THRU IEC
•
WHAT WE ARE DOING NOW Active information and education campaigns (IEC) – Provision of advisories to concerned LGUs previously identified as under threat (1,100 municipalities, 12,212 barangays) – Distribution of IEC materials (12,450 posters, 6,200 VCDs, 8,230 pamphlets and 7,235 maps) –Scheduled to carry out the Seminar –Workshop on Geohazards in Ilocos Sur province for all municipalities by August
BEYOND MAPPING: GETTING PEOPLE INVOLVED Direct advisories and critical data on the physical condition of the barangays covered by the mapping and assessment are provided to the local residents and officials to raise their awareness of the situation in their locality.
MAJOR ISSUES AND CONCERNS A) Continuing Loss of competent technical personnel (about 98 geologists)
Delay in the completion of critical components of the program particularly the field mapping and assessment and final map preparation and IEC Diminishing capacity to sustain assistance to LGUs affected by disasters and those requiring technical assistance
B) Lack of access to some areas due to:
Critical peace and order conditions (Samar, Abra, ARMM Provinces) Inaccesibility and difficult terrain (Kalinga-Apayao)
PROPOSED COURSE OF ACTION TO ADDRESS MAJOR ISSUES •
Request DBM and the Office of the President to allow the filling up of vacant positions at the MGB. Only 35 out of 110 technical positions were approved for filling up during the last request for authority. • Hiring and training of contractual personnel to speed up map digitization and data processing. • Increase coordination between implementers, LGUs, and the military in accessing critical areas.
MABUHAY! www.mgb.gov.ph MGB Compound, North Ave., Diliman, Quezon City, Philippines Tel +63 -2 9288642 Fax +63-2 9209120
Geohazard Mapping and Assessment Programme
NDCC December 2, 2009
Outline Overview of Natural Hazards in the
Philippines Mines and Geosciences Bureau – DENR Geohazard Mapping Programme
and
Major Issues and Concerns
Assessment
Overview of Natural Hazards in the Philippines The geographic and geologic setting of the Philippines (part of Pacific Ring of Fire and Earthquake Belt) \make it prone to various hazards, including: •typhoon/rain-related •volcano-related •earthquake-related •tsunami
Why are we hazard-prone? Numerous active Faults and Trenches
Pinatu Pinatubo bo
Ea Lu st Tro z on ug h
Manila Trench
Didica Didicass
Ph i lipp ine Taal Taal Fau lt os gr ch Ne ren T
ch ren T u Sul
Mayon Mayon Bulusa Bulusann
Kanla Kanlaon on
C o Tr tab en at ch o
Ph ilip pin eT ren ch
Parke Parkerr
Numerous volcanic belts and active volcanoes Generally mountainous terrane and steep slopes Numerous typhoons and extended rainy seasons/periods Strong and shifting wave currents
Exacerbated by…. Silted rivers and, in urban areas, clogged waterways Deforested and denuded forests POOR SITE SELECTION OF SETTLEMENT SITES!
Philippines: Along the Typhoon Belt
• ~ 20 tropical cyclones per year enter Philippine Area of Responsibility • ~ 9 cross the country per year • heavy rains related to many weather systems – ex. typhoon, moonsoon, coldfront
Why are we hazardGen. Nakar & Real, Quezon prone? Baguio City, 1990
St. Bernard, So. Leyte
Mt. Pinatubo, 1991
Geohazard Mapping and Assessment Programme The Geohazard Mapping and Assessment Program is an on-going priority undertaking of the Department of Environment & Natural Resources (DENR) being implemented by the Mines & Geosciences Bureau (MGB). Its main objective is to identify areas in the country that are susceptible or vulnerable to various geologic hazards (GEOHAZARDS), and increase public awareness in order to lessen or mitigate the negative impacts of these events.
Components of the program
1) Remote Sensing analysis
3) Data integration and processing (GIS)
5) Information Dissemination
2) Field mapping and assessment
4) Geohazard Map Production
Data processing and integration (GIS platform): An example
GEOHAZARDS MAP
= Topographic Map
+
Vegetation map
+
Drainage map
+
Geomorphic map
+
Slope map
+
Geologic map
HIGH SUSCEPTIBILITY - Presence of active/recent landslides - Large tension cracks that would affect the community - Areas w/ drainages that are prone to landslide damming - Steep slopes (21-55% gradient) POSSIBLE ACCUMULATION ZONE MODERATE SUSCEPTIBILITY
areas likely to be affected by transported landslide materials
•Areas with inactive & old landslides •Small tension cracks are located away from the community •moderately steep slopes (15-30%) •Small, shallow landslides (< 1.0 m vertical displacement)
LOW SUSCEPTIBILITY • gently sloping to sloping (5-15%) terrain • absence of tension cracks.
WHERE ARE WE NOW? •
•
Geohazards mapping and assessment of some 1,348 municipalities out of 1,618 total or 82% of the country Coastal hazards mapping has covered roughly 2,385 line kilometers of coastal areas –
The priority provinces of the eastern seaboard and other critical areas completed include Surigao del Norte Surigao del Sur, Aurora, So. Leyte, Rizal, Cavite, Quezon, Ilocos Norte, Leyte, Isabela, Cagayan, Davao Del Sur, Compostela Valley, Ilocos Sur, and the Bicol Provinces
DENR-MGB GEOHAZARD MAPPING STATUS OF ACCOMPLISHMENTS 2009
Year
Target
Accomplishment
Total
Percentage of Total Country
2010
Pre2006
2006
2007
2008
-
450
250
250
275
486
291
249
112
(138)
(132)
275
696
987
1,236
1,348
1,486
1,618
16.8%
42.5%
60.4%
75.6%
82.4%
90.9%
100%
As of June
End of Dec
250
End of June
132
STATUS OF GEOHAZARD MAPS PRODUCTION
Total Quadrangles 970
86% geohazard maps produced in digital and hardcopy printouts
WHAT WE ARE DOING NOW
ONGOING ACTIVITIES
•
On-going geohazards mapping and assessment in various areas of the country –Presently carrying out the geohazards assessment of Bukidnon, Misamiz Oriental and Lanao del Norte –Assessment work of areas identified as possible relocation sites for people affected by recent natural hazards and other critical areas that may be affected in the future.
MAKING PEOPLE EQUIPPED THRU IEC
•
WHAT WE ARE DOING NOW Active information and education campaigns (IEC) – Provision of advisories to concerned LGUs previously identified as under threat (1,100 municipalities, 12,212 barangays) – Distribution of IEC materials (12,450 posters, 6,200 VCDs, 8,230 pamphlets and 7,235 maps) –Scheduled to carry out the Seminar –Workshop on Geohazards in Ilocos Sur province for all municipalities by August
BEYOND MAPPING: GETTING PEOPLE INVOLVED Direct advisories and critical data on the physical condition of the barangays covered by the mapping and assessment are provided to the local residents and officials to raise their awareness of the situation in their locality.
MAJOR ISSUES AND CONCERNS A) Continuing Loss of competent technical personnel (about 98 geologists)
Delay in the completion of critical components of the program particularly the field mapping and assessment and final map preparation and IEC Diminishing capacity to sustain assistance to LGUs affected by disasters and those requiring technical assistance
B) Lack of access to some areas due to:
Critical peace and order conditions (Samar, Abra, ARMM Provinces) Inaccesibility and difficult terrain (Kalinga-Apayao)
PROPOSED COURSE OF ACTION TO ADDRESS MAJOR ISSUES •
Request DBM and the Office of the President to allow the filling up of vacant positions at the MGB. Only 35 out of 110 technical positions were approved for filling up during the last request for authority. • Hiring and training of contractual personnel to speed up map digitization and data processing. • Increase coordination between implementers, LGUs, and the military in accessing critical areas.
MABUHAY! www.mgb.gov.ph MGB Compound, North Ave., Diliman, Quezon City, Philippines Tel +63 -2 9288642 Fax +63-2 9209120
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