the valley fault system atlas in greater metro ... - marikina• quezon city, marikina city, makati...
TRANSCRIPT
-
The Valley Fault System
Atlas in Greater Metro Manila Area
-
Valley Fault System • East Valley Fault
• 10 km (M6.2) • Municipalities of Rodriguez
and San Mateo, Rizal • West Valley Fault
• 100 km (M7.2) • Bulacan ((Doña Remedios
Trinidad, Norzagaray and San Jose Del Monte City)
• Rizal (Rodriguez) • Quezon City, Marikina City,
Makati City, Pasig City, Taguig City and Muntinlupa City
• Laguna (San Pedro City, Biñan City, Sta. Rosa City, Cabuyao City and Calamba City)
• Cavite (Carmona, General Mariano Alvarez and Silang)
-
Evolution of the VFS Atlas • Studies conducted by PHIVOLCS in
1990s and published the 1:10,000 VFS map for Metro Manila and 1:50,000 map for nearby provinces in 2000
• In 2012, PHIVOLCS-DOST revisited the VFS as one component of the project “Enhancing Greater Metro Manila Areas (GMMA) Institutional Capacities for Effective Disaster/Climate Risk Management towards Sustainable Development”, or the GMMA-READY Project, supported by the UNDP and AusAid.
1:10,000
1:5,000
-
Why remap?
• Larger scale more detailed base maps are available
– More details of the current ground and built-up areas.
• Newly acquired old aerial photographs
1:10,000 1:5,000
-
Methodology • Interpreted aerial
photograph series – Year 1946, 1966 and
1982
• Translated into 1:5,000 topographic base maps from NAMRIA (2004) 1946 Aerial
Photograph
1:5,000 Topo Maps (MMEIRS, 2003)
-
Methodology
• Field validation
-
• Series of peer reviews (Internal and External)
Methodology
-
The Valley Fault System (VFS) in Greater Metro
Manila Areas Atlas
• 33 map sheets • Metro Manila
• 1:5,000 (22 map sheets) • Laguna and Cavite
• 1:10,000 (10 map sheets) • Bulacan and Rizal
• 1:50,000 (1 map sheet)
-
Reading the VFS Atlas
Legend
-
Map Scale
Index to adjoining sheets
Reading the VFS Atlas
-
Reading the VFS Atlas
-
Ground rupturing during earthquake was
documented. Topographic features associated
with active fault is clearly evident on aerial
photographs. And with clear transected land
features on the ground.
Hachured: Indicate downthrown areas
Same as solid line (certain trace) but
shows area that moves downward
Solid line: Fault trace is certain
Reading the VFS Atlas
-
500 m
N
Armed Forces and Police Mutual Benefit Ass. Inc.
Little waterfall
Brgy. Tumana
-
Dashed line: Fault trace is approximate
Fault whose precise location on the ground cannot be delineated
because erosion, human activity, etc. have erased their traces.
Dotted line: Fault trace is concealed
Fault trace is concealed on the ground by
recent sediment deposits. Usually across
rivers and river deposits, landslide deposits.
Reading the VFS Atlas
-
• shows fissures that are manifestation of ground subsidence • Largely observed from 1990 to 2000 in Taguig City,
Muntinlupa City, San Pedro City, Biñan City and Carmona.
Reading the VFS Atlas
• active fault coincides
with fissure; hachures
indicate the downthrown
area
-
Ladejo Subd.
Sto.Niño Subd
Brgy. Putatan
1
1
2 3
2 3
Muntinlupa Institute of Technology
-
Buffer Zone
The recommended minimum buffer zone, or zone of avoidance, against ground rupture hazard is at least 5 meters as reckoned from both sides of the fault trace or from the edge of the deformation zone.
-
Useful information for
land-use planning,
engineering and
construction, scientific
research, disaster risk
reduction and
mitigation programs
-
Contact Us: http://www.phivolcs.dost.gov.ph
/phivolcs_dost
Philippine Institute of Volcanology and Seismology (PHIVOLCS-DOST)
Earthquake & Tsunami (24/7):
Tel. Numbers
+632 929-9254
+632 426-1468 loc 124 / 125
Fax number
+632 927-1087
Volcano (24/7):
Tel. Numbers
+632 426-1468 loc 127
Telefax number
+632 927-1095
IEC materials:
+632 426-1468 loc 128
+632 927-4524