8/26/2011

1

Geological Hazard MapsGeological Hazard MapsCarmona, CaviteCarmona, Cavite

What is a Fault?What is a Fault?

Fractures in theearth’s surfacewhere rockmovementhas taken placeand earthquakeshave beenproduced.

8/26/2011

2

Active Fault – trace certain

Active Fault – trace approximate

• Showing position of West Valley FaultLine (Marikina Fault Line) Runningthrough the Municipality.

Carmona Ground RuptureCarmona Ground Rupture

g p y• West Valley Fault runs thru the northern

edge of Southwoods along SouthwoodsDrive all the way down to CitylandSubdivision, running along sugar roadcutting thru Kinnari Subd till it reachesBiñan river

West Valley Fault at CarmonaWest Valley Fault at Carmona West Valley Fault at CarmonaWest Valley Fault at Carmona

Ground Shaking Simulation using Ground Shaking Simulation using REDAS Software of PhiVolcsREDAS Software of PhiVolcs

• Probability-High, Intensity 5-8

• West Valley Fault (Marikina Fault) C fLine) cuts right thru Carmona from

north to south

8/26/2011

3

Intensity Scale DescriptionIntensity Scale Description

VIIIVery Destructive - People panicky. People find it difficult tostand even outdoors. Many well-built buildings are considerablydamaged. Concrete dikes and foundation of bridges aredestroyed by ground settling or toppling. Railway tracks aredestroyed by ground settling or toppling. Railway tracks arebent or broken. Tombstones may be displaced, twisted oroverturned. Utility posts, towers and monuments mat tilt ortopple. Water and sewer pipes may be bent, twisted or broken.Liquefaction and lateral spreading cause man- made structureto sink, tilt or topple. Numerous landslides and rockfalls occurin mountainous and hilly areas. Boulders are thrown out fromtheir positions particularly near the epicenter. Fissures andfaults rapture may be observed. Trees are violently shaken.Water splash or stop over dikes or banks of rivers.

Liquefaction Hazard MapLiquefaction Hazard Map

• General profile of soil in Carmona is volcanic ash and pyroclastic sand in high percentage mixed with clay loam

Liquefaction ImpactsLiquefaction Impacts

Subsidence Lateral spreading/fissuring

Sand Boil

Sand Buoyant Rise ofBuried Structures

Localities prone to liquefaction are:

a)water-saturated (shallow water table), lowlying

Characteristics of Characteristics of liquefaction prone areasliquefaction prone areas

o y g

b) Have loose (unconsolidated), sandy or siltydeposits

• river banks, abandoned rivers, flood plains• coastlines• swamps

8/26/2011

4

Earthquake Induced Landslides/Earthquake Induced Landslides/Rain Induced Landslides Rain Induced Landslides

• Carmona map showing EIL(Earthquake Induced Landslidesand its deposition areas).p )

• Steep slopes of Lantic & Bancal, aswell as major river banks

Flood Hazard MapFlood Hazard Map

• Carmona map showing possible flooding areas

• Areas @ Cabilang-Baybay & Southwoods, part of PTC and Goldenmile mostly nearpart of PTC and Goldenmile, mostly near the river banks and areas with clogged drainage

8/26/2011

5

In front of DILG

Major Outfall

Daromar Bridge

Simundac’s Property

Phase 4MJC Road

Sugar Road

Casal’s Property

Milagrosa homes From Brgy. 5

to Milagrosa Bridge

Building

CNHS Premise

Mabuhay -Milagrosa Boundary NEXT

Pasong Pari River – Major Outfall Quarried Area

Phase 4

Directional water flow from the top ofPhase 4

Pasong Pari River

Quarried Area at Phase 4

Phase 4Encroached makeshift houses –creek towards Pasong Pari River

Pond at Phase 4

Phase 4

Phase 4

Encroached houses and bulk of garbage along waterways of Phase 4

Sunpack Container Mfg.

2 holes at the concrete fence of Sunpack Mfg. Corp.

Non-functional Manhole

8/26/2011

6

Water coming from LOGCOM

MJC Road, Lantic

Corner of Manila Jockey Club access roadTemporary Earth Canal beside Manila

Jockey Club access road

C l l f P ti di AKuok’s Property

Sugar Road

Canal along corner of Patindig Arawp y

Barreto’s Property Sugar Road

Daromar Bridge, Mabuhay

Daromar,, Mabuhay

Daromar , Mabuhay Daromar , Mabuhay

8/26/2011

7

Daromar , Mabuhay

CNHS Premise

Milagrosa Homes

Encroachment along creek of Milagrosa Homes

- existing waterway is smaller due to

encroached concrete fence-broken fence due to typhoon which caused

flash flood inside Milagrosa Homes

Milagrosa Homes

Milagrosa Homes wooden bridge Excavated earth canal at Hebron’s property beside Milagrosa Homes

Simundac Property

Simundac Property

8/26/2011

8

Casal Property

Brgy. 5 to Milagrosa Bridge

Mabuhay – Milagrosa Boundary

Mabuhay – Milagrosa Boundary

Mabuhay – Milagrosa Boundary

Front of DILG-Estrellita’s Property

8/26/2011

9

Front of DILG-Estrellita’s Property

Front of DILG-Estrellita’s Property

Public Market Bridge

THEMATIC MAPS OVERLAID

BRIEF DESCRIPTION OF CONFLICT AREA

EXPLANATIONS FOR CONFLICT

IMPLICATIONS WHEN UNRESOLVED

POLICY OPTIONS

Hazard Map:

1. Ground Shaking(Earthquake) Hazard -,

West Valley Fault(Marikina Fault Line)cuts right thru Carmonafrom north to south

Epicenter of a largeearthquake is veryprobable in any point ofthe Fault insideCarmona

Earthquake withepicenter within 14 kmradius would causegreat damage to life andproperty if not preparedupon

Strengthenadministration ofexisting building codethru strictimplementation andfurther research andstudy of the soundnessof said rules andregulations

2. Ground Rupture ,Probability High

Again, West Valley Faultruns thru the northern

All sites along the lineare high density built up

People & property alongthe fault is highly

All properties along faultline should be relocatedProbability-High runs thru the northern

edge of Southwoodsalong Southwoods Driveall the way down toCityland Subdivision,running along sugarroad cutting thru KinnariSubd till it reachesBiñan river

are high density built-upareas with most of thehigh end developmentalmost settled.Especially @ the southpart where CanyonRanch & KinnariEstates are located.The east side of thefault is pushing downagainst the westernplate which is thehighland part ofCarmona

the fault is highlysusceptible to damageand/or total destruction.

line should be relocated,buffer zones establishedand area should berezoned as a park oropen space

THEMATIC MAPS OVERLAID

BRIEF DESCRIPTION OF CONFLICT AREA

EXPLANATIONS FOR CONFLICT

IMPLICATIONS WHEN UNRESOLVED

POLICY OPTIONS

Hazard Map:

3. Earthquake InducedLandslides/RainInduced Landslides

Steep slopes of Lantic &Bancal, as well as majorriver banks

Canyon Ranch islocated at a steep slopethat has been cut &filled weakening theedges along the riverboundaries likewisePhase 4 is right besidea very high edge ofwhat was once a hillweakened by rain &quarrying

Residential areas are indanger of being caughtin a landslide if nocounter-measures areundertaken

Move settlement awayfrom danger zones andestablished buffer zonesby identifying depositionsites of landslide proneareas

q y g

4. Flooding Areas @ Cabilang-Baybay & Southwoods,part of PTC andGoldenmile, mostly nearthe river banks andareas with cloggeddrainage

All four major riversystems of Carmonadrains thru only oneriver system in Biñan,Laguna causingbackflows during heavyrains due to typhoons

Disruption of industrialoperation anddestruction ofresidential houses andother infrastructures aswell as damage toagriculture

Formulate a masterplan for an adequatedrainage system andcoordinate action withthe LGU of Biñan,Laguna since it is thecatch basin of the area

5. Liquefaction-moderate

General profile of soil inCarmona is volcanicash and pyroclasticsand in high percentagemixed with clay loam

A large earthquakecould cause settling ofsoil and buildingfoundations couldweaken. Also, largevolume of rainwatermay also cause thesame

Damage to majorinfrastructure andbuildings may cost hugeeconomic problems

Structural foundationsshould always bechecked upon speciallyduring construction andregular inspection mustbe conducted

1.Mainstreaming DRR/CCA in the CLUP2.IEC3.Strict enforcement of Building Code4 S lid W t M t

LGU Actions…LGU Actions…

4.Solid Waste Management5.Structural and Non-Structural

Measures6.Commitment and good governance

8/26/2011

10