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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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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


b-b c-c

Strike () 0 N-S N-S

Dip angle () 30~50 30 40




Elastic dislocation model 1: Megathrust faultElastic dislocation model 1: Megathrust fault

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a-a c-c

Strike () 0 N-S N-S

Dip angle () 30~80 30 60




Elastic dislocation model 2: Intraplate faultElastic dislocation model 2: Intraplate fault


a-a c-c

Strike () 0 N-S N-S

Dip angle () 30~80 30 60




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)


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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

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