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West IlocosWest IlocosFault SystemFault System
Dummon RiverDummon RiverFault SystemFault System
Divalacan FaultDivalacan Fault
CaslguranCaslguranFaultFault
PFZ:Bangui FaultPFZ:Bangui Fault
PFZ:AbraPFZ:AbraRiver FaultRiver Fault
PFZ:PFZ:Tubao FaultTubao Fault
PFZ:Infanta FaultPFZ:Infanta Fault
PFZ:SibuyanPFZ:SibuyanSea FaultSea Fault
PFZ:Masbate FaultPFZ:Masbate Fault
PFZ:CentralPFZ:CentralLeyte FaultLeyte Fault
PFZ:LiangaPFZ:LiangaFaultFault
PFZ:Mati FaultPFZ:Mati Fault
Tangbulan FaultTangbulan Fault
Mindanao Fault(MF):Mindanao Fault(MF):Daguma extensionDaguma extension
PFZ:EasternPFZ:EasternMindanao FaultMindanao Fault
West Panay FaultWest Panay Fault
CentralCentralNegros FaultNegros Fault
PFZ:Guinyangan FaultPFZ:Guinyangan Fault
East ZambalesEast ZambalesFaultFault
Iba FaultIba Fault
Valley Fault SystemValley Fault System
Lubang FaultLubang Fault AglubangAglubangRiver FaultRiver Fault
SouthernSouthernMindoro FaultMindoro Fault
Tablas FaultTablas Fault
Project AreaProject Area
CentralCentralMindoro FaultMindoro Fault
CentralCentralMarinduque FaultMarinduque Fault
Lake BatoLake BatoLineamentLineament
Northern SamarNorthern SamarLineamentLineament
Southern SamarSouthern SamarLineamentLineament
Cebu LineamentCebu Lineament
East Bohol FaultEast Bohol Fault
Cabanglasan FaultCabanglasan Fault
Davao River FaultDavao River Fault
CentralCentralMindanaoMindanaoFaultFault
LanaoLanaoFault SystemFault System
MF:WesternMF:WesternMindanao ExtensionMindanao Extension
ZamboangaZamboangaFault SystemFault System
Philippine Fault Zone(PFZ):Philippine Fault Zone(PFZ):Dgdig FaultDgdig Fault
Ma
nil
a T
ren
chM
an
ila T
ren
chP
hilip
pin
e Tren
ch
Ph
ilipp
ine T
rench
Neg
ros
Tre
nch
Neg
ros
Tre
nch
Sulu T
rench
Sulu T
rench
Cotab
ato Tren
ch
Cotab
ato Tren
ch
East
Lu
zon
Tro
ugh
East
Lu
zon
Tro
ugh
West IlocosFault System
Dummon RiverFault System
Divalacan Fault
CaslguranFault
PFZ:Bangui Fault
PFZ:AbraRiver Fault
PFZ:Tubao Fault
PFZ:Infanta Fault
PFZ:SibuyanSea Fault
PFZ:Masbate Fault
PFZ:CentralLeyte Fault
PFZ:LiangaFault
PFZ:Mati Fault
Tangbulan Fault
Mindanao Fault(MF):Daguma extension
PFZ:EasternMindanao Fault
West Panay Fault
CentralNegros Fault
PFZ:Guinyangan Fault
East ZambalesFault
Iba Fault
Valley Fault System
Lubang Fault AglubangRiver Fault
SouthernMindoro Fault
Tablas Fault
Project Area
CentralMindoro Fault
CentralMarinduque Fault
Lake BatoLineament
Northern SamarLineament
Southern SamarLineament
Cebu Lineament
East Bohol Fault
Cabanglasan Fault
Davao River Fault
CentralMindanaoFault
LanaoFault System
MF:WesternMindanao Extension
ZamboangaFault System
Philippine Fault Zone(PFZ):Dgdig Fault
Ma
nil
a T
ren
chP
hilip
pin
e Tren
ch
East
Lu
zon
Tro
ugh
Neg
ros
Tre
nch
Sulu T
rench
Cotab
ato Tren
ch
Figure B2.1
Distribution of Active Faults and Trenches in PhilippinesSource: PHILVOLCS (2000)
N
Legend:
City/Town
Roads/highways
Trench-related fault
Collision Zone
Transform Fault
Trench
Dashed line-approximate offshore project
Dashed line-trace approximate;
Active Fault:Solid line-trace certain;
0 100 200km
▲ ▲
▲ ▲
BF-1
PFZ:Gabaldon
PFZ:Gabaldon
segment
segment
East
East
Zanbales F
ault
Zanbales
Fault
Iba FaultIba Fault
PF
Z:In
fanta seg
men
tP
FZ
:Infan
taseg
men
t
Val
ley F
ault
Syst
em
Val
ley
Fau
ltS
yst
em
Central M
arindug
Central M
arindug
FaultFault
Agubang
Agubang
River F
ault
River
Fault
Central
Central
Mindoro F
ault
Mindoro
Fault
TarlacTarlac
San FernandoSan Fernando
MalolosMalolos
ManilaManila
ImusImus
BalangaBalanga
NasugbuNasugbu
BatangasBatangas
LucenaLucena
BoacBoacCalapanCalapan
Project AreaProject Area
InfantaInfanta
Sta.CruzSta.Cruz
PFZ:Gabaldon
segment
East
Zanbales F
ault
Iba Fault
Philip
pin
e Fau
lt Zone (P
FZ
):Infan
ta segm
ent
Central M
arindug
FaultAgubang
River F
ault
Central
Mindoro F
ault
Project AreaProject Area
Tarlac
San Fernando
Infanta
Sta.Cruz
Malolos
Manila
Imus
Balanga
Nasugbu
Batangas
Lucena
BoacCalapan
Val
ley F
ault
Syst
emAntipolo
Marikina
Figure B2.2 Distribution of Active Faults in Southern LuzonBy PHILVOLCS (2000)
N
Legend:
Roads/highways
City/Town
Dashed line-trace approximate
Approximate offshore projection
Active Fault:Solid line-trace certain
0 15 30km
BF-2
14 30'
14 45'
15 00' 121 15' 121121 30'30'121 30'
121 15' 121 30'
PolilloPolilloStraitStrait
Miray R.
Miray R.
Nangka
R iver
Kanan No.1DamKanan No.1DamKanan No.2DamKanan No.2Dam
AIAI
OCOC
YCYC
YCYC
YCYC
NINI
NINI
OLOL
YLYL OCOC
OCOC
QVPQVP
OCOC
AIAIOLOL
QVPQVP
KananKananNo.B1DamNo.B1Dam
Kaliwa-LowNo.2DamKaliwa-LowNo.2Dam
Kaliwa-LowNo.1DamKaliwa-LowNo.1Dam
Laiban DamLaiban Dam
AntipolaAntipola Tanay AreaTanay AreaS
ierr
a M
adre
Sie
rra
Mad
re
Philip
pin
e Fau
lt Zone
Philip
pin
eF
ault
Zone
InfantaInfanta
PillilaPillila
BarasBaras
RosarioRosario
Riv
erR
iver
MarikinaMarikina
MontalbanMontalban
SanSan MateoMateo
Mar
ikin
a
Mar
ikin
a
MoroneMorone
Taytay TaytayPasigPasig
AnsonoAnsono
River
River
TaguigTaguig
CardonaCardona
AntipoloAntipolo
TeresaTeresa
Riv
erR
iver
AgosAgos AfterbayAfterbay WeirWeir
Agos DamAgos Dam
Prov
ince
of
Lgune
Prov
ince
of
Rizal
Province of Q
uezon
Province
ofQ
uezon
Province of R
izai
Province
ofR
izai
Lim
utan River
Lim
utanR
iver
Bosoboso R
iv
er
Mon
talb
anR
ive
r
Province of RizaiProvince of Bulacan
Miray R.
Miray R.
Nangka
R iver
Ago
s
Ago
s
Riv
er
Riv
er
Kal
iwa
Kal
iwa
Lenatin River
LenatinRiver
Angat River
Angat River
Polillo Strait
Lamon Bay
Laguna de Bay
Kanan No.1DamKanan No.2Dam
Ago
s
Riv
er
AI
OC
YC
YC
YC
NI
NI
OL
YL OC
OC
QVP
OC
AIOL
QVP
KananNo.B1Dam
Kaliwa-LowNo.2Dam
Kaliwa-LowNo.1Dam
Laiban Dam
Antipola Tanay AreaS
ierr
a M
adre
Philip
pin
e Fau
lt Zone
Infanta
Sta.Maria
Pillila
Baras
Rosario
Riv
er
Marikina
Montalban
San Mateo
Mar
ikin
a
Morong
Taytay Pasig
Angono
River
Taguig
Cardona
Binangonan
Antipolo
Teresa
Famy
Riv
er
Kal
iwa
Agos Afterbay Weir
Agos Dam
Prov
ince
of
Laguna
Prov
ince
of
Rizal
Province of Q
uezon
Province of R
izai
Lenatin River
Lim
utan River
Bosoboso R
iv
er
Mon
talb
anR
ive
r
Province of RizaiProvince of Bulacan
Miray R.
Nangka
R iver
Angat River
YL
Based on Nippon-Koei & Lahmeyer International (1992)
N
Figure B2.3 Regional Geological Map
0 5 10km
Legend:
Geologic Boundary
Fault
Dioritic Intrusions
Cretaceous-Miocene-Older Reef Ilmestone
Cretaceous-Miocene-Older Clastic,Volcanic and Volcanoclastic Deposits
Mioccene-Younger Reef
Mioccene-Younger Clastic Series
Pleistocene-Young Volcanic andPyroclastic Deposits
Alluvial DepositsAI
QvpQvp
YCYC
OCOC
OLOL
NINI
TLTL
Qvp
YC
OC
OL
NI
YL
BF-3
10 km Distance
from Agos Dam Site
Agos Dam Site
F7
F5
F1 F3
F2
F6F8
F4
Philippine
Fault Zone
(InfantaFault)
1,000m 0 1,000 2,000 3,000 4,000 5,000
LEGEND
Class I : Active faultIt's certainly active fault.
Class II : Assumed active faultIt's almost certainly active fault.
Class III : Any clear factor is not observedthat indicated by active fault.
Factor of active fault
Certainly of active fault
Fault bulge
Triangular slope
Misalignment of river
Distribution of the Active Fault around the Agos Dam SiteBased on the analysis of aerial photographs
Figure B4.1
BF-4
BF-5