1300-1315 Ramosggg
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Tectonic implications of uplifted Holocene marine terracesTectonic implications of uplifted Holocene marine terracesinin PangasinanPangasinan and Davao Oriental, Philippinesand Davao Oriental, Philippines
NoelynnaNoelynna T.T. RamosRamosaa, Hiroyuki, Hiroyuki TsutsumiTsutsumibb, Jeffrey S., Jeffrey S. PerezPerezb,cb,c, and Percival P., and Percival P. BermasBermas,, Jr.Jr.dd
aaRushurgentRushurgent Working Group, National Institute of Geological Sciences, College of Science,Working Group, National Institute of Geological Sciences, College of Science,
University of the Philippines,University of the Philippines, DilimanDiliman, Quezon City 1101, Philippines, Quezon City 1101, PhilippinesbbDepartmentDepartment of Geophysics, Graduate School of Science, Kyoto University, Kyoto 606of Geophysics, Graduate School of Science, Kyoto University, Kyoto 606--8502, Japan8502, Japan
ccDepartmentDepartment of Science and Technologyof Science and Technology -- Philippine Institute ofPhilippine Institute of VolcanologyVolcanology and Seismology,and Seismology,
C. P. Garcia Avenue,C. P. Garcia Avenue, DilimanDiliman, Quezon City 1104, Philippines, Quezon City 1104, PhilippinesddMinesMines and Geosciences Bureau XIand Geosciences Bureau XI -- Department of Environment and Natural Resources,Department of Environment and Natural Resources,
6969 KonsuelaKonsuela Bldg., cor. Jacinto St., Davao City 8000, PhilippinesBldg., cor. Jacinto St., Davao City 8000, Philippines
GeoConGeoCon 2011: Geology Working For A Resilient Society2011: Geology Working For A Resilient Society
CrowneCrowne Plaza Hotel, Quezon CityPlaza Hotel, Quezon City
08 December 201108 December 2011
NoelynnaNoelynna T.T. RamosRamosaa, Hiroyuki, Hiroyuki TsutsumiTsutsumibb, Jeffrey S., Jeffrey S. PerezPerezb,cb,c, and Percival P., and Percival P. BermasBermas,, Jr.Jr.dd
aaRushurgentRushurgent Working Group, National Institute of Geological Sciences, College of Science,Working Group, National Institute of Geological Sciences, College of Science,
University of the Philippines,University of the Philippines, DilimanDiliman, Quezon City 1101, Philippines, Quezon City 1101, PhilippinesbbDepartmentDepartment of Geophysics, Graduate School of Science, Kyoto University, Kyoto 606of Geophysics, Graduate School of Science, Kyoto University, Kyoto 606--8502, Japan8502, Japan
ccDepartmentDepartment of Science and Technologyof Science and Technology -- Philippine Institute ofPhilippine Institute of VolcanologyVolcanology and Seismology,and Seismology,
C. P. Garcia Avenue,C. P. Garcia Avenue, DilimanDiliman, Quezon City 1104, Philippines, Quezon City 1104, PhilippinesddMinesMines and Geosciences Bureau XIand Geosciences Bureau XI -- Department of Environment and Natural Resources,Department of Environment and Natural Resources,
6969 KonsuelaKonsuela Bldg., cor. Jacinto St., Davao City 8000, PhilippinesBldg., cor. Jacinto St., Davao City 8000, Philippines
GeoConGeoCon 2011: Geology Working For A Resilient Society2011: Geology Working For A Resilient Society
CrowneCrowne Plaza Hotel, Quezon CityPlaza Hotel, Quezon City
08 December 201108 December 2011
Holocene coastal uplift in the western PacificHolocene coastal uplift in the western Pacific
HT: 6 (21 m)
HT: 6 (11 m)
HT: 7 (24 m)
(80 m)
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Bathymetriy: NGDC; Topography: SRTM; PFZ: Tsutsumi and Perez, 2010; Instrumental seismicity (M>6) (1897-2008): PHIVOLCS;
Historical seismicity (M>6) (1619-1894): Bautista and Oike, 2000
1897 - 2008 1619 - 1894
Seismicity in the PhilippinesSeismicity in the Philippines
Holocene coastal uplift in the western PacificHolocene coastal uplift in the western Pacific
HT: 6 (21 m)
HT: 6 (11 m)
HT: 7 (24 m)
(80 m)
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ObjectivesObjectives
To identify and systematically map Holocene marine
terraces in Pangasinan and Davao Oriental
To evaluate the seismotectonic potential of tectonic
structures (e.g. Manila trench, Philippine trench)
Western PangasinanWestern Pangasinan
Bathymetry: NGDC; Topography: NASA; GPS vectors: Rangin et al., 1999; Focal mechanisms (1976-2008): Global CMT;
Seismicity (1897-2008) and PFZ: PHIVOLCS
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Terrace mapsTerrace maps
Modified from Maemoku and Paladio, 1992
Holocene marine terracesHolocene marine terraces
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Holocene marine terracesHolocene marine terraces
Deformation pattern and tectonic implicationsDeformation pattern and tectonic implications
prehistoric earthquakes are
probably offshore
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Elastic dislocation model 1: Megathrust faultElastic dislocation model 1: Megathrust fault
Fault parametersFault model
b-b c-c
Strike () 0 N-S N-S
Dip angle () 30~50 30 40
Top depth (km) 0 0 0
Bottom depth (km) 40~70 50 60
Amount of reverseslip (m) 10~26 16 16
Fault parametersFault model
b-b c-c
Strike () 0 N-S N-S
Dip angle () 30~50 30 40
Top depth (km) 0 0 0
Bottom depth (km) 40~70 50 60
Amount of reverseslip (m) 10~26 16 16
Elastic dislocation model 1: Megathrust faultElastic dislocation model 1: Megathrust fault
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Fault parametersFault model
a-a c-c
Strike () 0 N-S N-S
Dip angle () 30~80 30 60
Top depth (km) 0 0 0
Bottom depth (km) 15~40 15 30
Amount of reverseslip (m) 7~9 9 7
Elastic dislocation model 2: Intraplate faultElastic dislocation model 2: Intraplate fault
Fault parametersFault model
a-a c-c
Strike () 0 N-S N-S
Dip angle () 30~80 30 60
Top depth (km) 0 0 0
Bottom depth (km) 15~40 15 30
Amount of reverseslip (m) 7~9 9 7
Elastic dislocation model 2: Intraplate faultElastic dislocation model 2: Intraplate fault
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Eastern Davao OrientalEastern Davao Oriental
Bathymetry: NGDC; Topography: NASA; GPS vectors: Rangin et al., 1999; Focal mechanisms (1976-2008): Global CMT;
Seismicity (1897-2008): PHIVOLCS; PFZ main trace: Tsutsumi and Perez (2010)
Holocene marine terracesHolocene marine terraces
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Deformation patternDeformation pattern
ConclusionsConclusions
Pangasinan
Davao Oriental
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Summary and conclusionsSummary and conclusions
Pangasinan Davao Oriental
Elevation of
paleoshoreline
angle (m amsl)
TIV -- 8~12TIII / T3 4~11 6~10
TII / T2 2~7 3~6
TI / T1 1~5 1~5
Radiocarbon
ages (cal yr BP)6480 to 1325 8080 to 4140
Maximum uplift
rate (mm/yr)
Pleistocene ~1.3 ~1.3
Holocene ~1.7 ~1.5
Deformation
pattern
paleoshoreline angles are highest along headlands
facing the subduction zone (e.g. Manila trench,
Philippine trench)Uplift
mechanismcoseismic uplift
Earthquake
magnitude7.7~8.5 > 7.5
Source fault offshore reverse fault (offshore reverse fault)
Thank youThank you
Kyoto University (Active Tectonics lab, S. Toda, N.Kyoto University (Active Tectonics lab, S. Toda, N. ShimobayashiShimobayashi))
PaleoLabPaleoLab, Japan, Japan
Y. Ota, A.Y. Ota, A. MeltznerMeltzner, M. Liu,, M. Liu, J.B.H.ShyuJ.B.H.Shyu, N. Litchfield, N. Litchfield
University of the Philippines (University of the Philippines (RushurgentRushurgent Working GroupWorking Group -- NationalNational
Institute of Geological Sciences, Marine Science Institute)Institute of Geological Sciences, Marine Science Institute)
Philippine Institute of Volcanology and SeismologyPhilippine Institute of Volcanology and Seismology
Mines and Geosciences BureauMines and Geosciences Bureau
local government officials oflocal government officials of PangasinanPangasinan and Davao Orientaland Davao Oriental
provincesprovinces