Shear Partitioning in the Philippines: Constraints from Philippine Fault and Global Positioning System Data
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Neogene Sutures in Eastern Indonesia
Journal of Asian Earth Sciences 18 (2000) 781–808 www.elsevier.nl/locate/jseaes Neogene sutures in eastern Indonesia R. Hall*, M.E.J. Wilson1 SE Asia Research Group, Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Received 4 February 2000; accepted 21 July 2000 Abstract Five suture zones are described from the zone of collision between the Eurasian, Indian–Australian and Pacific–Philippine Sea plates within the eastern Indonesia region. These are the Molucca, Sorong, Sulawesi, Banda and Borneo sutures. Each of these sutures has a relatively short history compared to most pre-Neogene orogenic belts, but each preserves a record of major changes in tectonics including subduction polarity reversals, elimination of volcanic arcs, changing plate boundaries, and important extension within an overall contrac- tional setting. Rapid tectonic changes have occurred within periods of less than 5 Ma. Many of these events, although important, would be overlooked in older orogenic belts because the age resolution required to identify them, even when the evidence is preserved, is simply not possible. ᭧ 2000 Elsevier Science Ltd. All rights reserved. Keywords: Suture zones; Eastern Indonesia; Tectonic changes 1. Introduction that could be regarded as ranging from trivial to cata- strophic. However, it does create problems when attempting Eastern Indonesia is situated at the junction of three major to define sutures and to understand their development, parti- plate regions: the Eurasian, Indian–Australian and Pacific– cularly when comparison is to be made with orogenic events Philippine Sea plates (Fig. 1). The boundary between each much earlier in the history of the Earth when the time reso- pair of plates is a relatively narrow zone of deformation, lution may be much less, and when orogenic deformation typically of the order of 100–200 km; although a detailed has clearly finished. -
(2019): Upper-Mantle Density Structure in the Philippine Sea and Adjacent Region and Its Relation to Tectonics
Originally published as: Liang, Q., Chen, C., Kaban, M. K., Thomas, M. (2019): Upper-mantle density structure in the Philippine Sea and adjacent region and its relation to tectonics. - Geophysical Journal International, 219, 2, pp. 945—957 DOI: http://doi.org/10.1093/gji/ggz335 This article has been accepted for publication in Geophysical Journal International ©The Author(s) 2019. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Geophys. J. Int. (2019) 219, 945–957 doi: 10.1093/gji/ggz335 Advance Access publication 2019 July 30 GJI Gravity, Geodesy and Tides Upper-mantle density structure in the Philippine Sea and adjacent region and its relation to tectonics Downloaded from https://academic.oup.com/gji/article-abstract/219/2/945/5541063 by Geoforschungszentrum Potsdam user on 06 September 2019 Qing Liang,1,2 Chao Chen,1,2 Mikhail K. Kaban2,4 and Maik Thomas2,3 1Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, P.R. China. E-mail: [email protected]; [email protected] 2Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam 14473,Germany 3Institute of Meteorology, Freie Universitat¨ Berlin, Berlin 12165,Germany 4Schmidt Institute of Physics of the Earth RAS, Moscow 123242, Russia Accepted 2019 July 20. Received 2019 June 14; in original form 2019 February 27 SUMMARY The evolution of the Philippine Sea Plate (PSP) since Jurassic is one of the key issues in the dynamics of lithosphere and mantle. The related studies benefited mostly from seismic tomography which provides velocity structures in the upper mantle. -
Assessment of Tsunami Hazard in Sabah – Level of Threat, Constraints and Future Work Felix Tongkul*, Rodeano Roslee, Ahmad Khairut Termizi Mohd Daud
Bulletin of the Geological Society of Malaysia, Volume 70, November 2020, pp. 1 - 15 DOI: https://doi.org/10.7186/bgsm70202001 Assessment of tsunami hazard in Sabah – Level of threat, constraints and future work Felix Tongkul*, Rodeano Roslee, Ahmad Khairut Termizi Mohd Daud Natural Disaster Research Centre (NDRC) Universiti Malaysia Sabah, 88400, Kota Kinabalu, Sabah, Malaysia * Corresponding author email address: [email protected] Abstract: The coastal areas of Sabah are exposed to far-field earthquake-induced tsunamis that could be generated along the trenches of Manila, Negros, Sulu, Cotabato, Sangihe and North Sulawesi. Tsunami simulation models from these trenches indicated that tsunami waves can reach the coast of Sabah between 40 and 120 minutes with tsunami wave heights reaching up to 3 m near the coast. The level of tsunami threat is high in southeast Sabah due to its narrow continental shelf and proximity to tsunami source in the North Sulawesi Trench. The level of tsunami threat is moderate in north and east Sabah due to their proximity to tsunami source in the Sulu Trench. The level of tsunami threat is low in west Sabah due to its distant location to tsunami source from the Manila Trench. While tsunamis cannot be prevented, its impact on human life and property can be reduced through proper assessment of its threat using tsunami simulation models. Unfortunately, constraints remain in producing a reliable tsunami inundation models due to the lack of high-resolution topography and bathymetry data in Sabah and surrounding seas. It would be helpful if such data can be acquired by the relevant government agencies, at least first, in high threat-level areas, such as Tawau and Semporna districts. -
Geologic History of Siletzia, a Large Igneous Province in the Oregon And
Geologic history of Siletzia, a large igneous province in the Oregon and Washington Coast Range: Correlation to the geomagnetic polarity time scale and implications for a long-lived Yellowstone hotspot Wells, R., Bukry, D., Friedman, R., Pyle, D., Duncan, R., Haeussler, P., & Wooden, J. (2014). Geologic history of Siletzia, a large igneous province in the Oregon and Washington Coast Range: Correlation to the geomagnetic polarity time scale and implications for a long-lived Yellowstone hotspot. Geosphere, 10 (4), 692-719. doi:10.1130/GES01018.1 10.1130/GES01018.1 Geological Society of America Version of Record http://cdss.library.oregonstate.edu/sa-termsofuse Downloaded from geosphere.gsapubs.org on September 10, 2014 Geologic history of Siletzia, a large igneous province in the Oregon and Washington Coast Range: Correlation to the geomagnetic polarity time scale and implications for a long-lived Yellowstone hotspot Ray Wells1, David Bukry1, Richard Friedman2, Doug Pyle3, Robert Duncan4, Peter Haeussler5, and Joe Wooden6 1U.S. Geological Survey, 345 Middlefi eld Road, Menlo Park, California 94025-3561, USA 2Pacifi c Centre for Isotopic and Geochemical Research, Department of Earth, Ocean and Atmospheric Sciences, 6339 Stores Road, University of British Columbia, Vancouver, BC V6T 1Z4, Canada 3Department of Geology and Geophysics, University of Hawaii at Manoa, 1680 East West Road, Honolulu, Hawaii 96822, USA 4College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Administration Building, Corvallis, Oregon 97331-5503, USA 5U.S. Geological Survey, 4210 University Drive, Anchorage, Alaska 99508-4626, USA 6School of Earth Sciences, Stanford University, 397 Panama Mall Mitchell Building 101, Stanford, California 94305-2210, USA ABSTRACT frames, the Yellowstone hotspot (YHS) is on southern Vancouver Island (Canada) to Rose- or near an inferred northeast-striking Kula- burg, Oregon (Fig. -
Large Intermediate-Depth Earthquakes and the Subduction Process
80 Physics ofthe Earth and Planetary Interiors, 53 (1988) 80—166 Elsevier Science Publishers By., Amsterdam — Printed in The Netherlands Large intermediate-depth earthquakes and the subduction process Luciana Astiz ~, Thorne Lay 2 and Hiroo Kanamori ~ ‘Seismological Laboratory, California Institute of Technology, Pasadena, CA (U.S.A.) 2 Department of Geological Sciences, University ofMichigan, Ann Arbor, MI (USA.) (Received September 22, 1987; accepted October 21, 1987) Astiz, L., Lay, T. and Kanamori, H., 1988. Large intermediate-depth earthquakes and the subduction process. Phys. Earth Planet. Inter., 53: 80—166. This study provides an overview of intermediate-depth earthquake phenomena, placing emphasis on the larger, tectonically significant events, and exploring the relation of intermediate-depth earthquakes to shallower seismicity. Especially, we examine whether intermediate-depth events reflect the state of interplate coupling at subduction zones. and whether this activity exhibits temporal changes associated with the occurrence of large underthrusting earthquakes. Historic record of large intraplate earthquakes (m B 7.0) in this century shows that the New Hebrides and Tonga subduction zones have the largest number of large intraplate events. Regions associated with bends in the subducted lithosphere also have many large events (e.g. Altiplano and New Ireland). We compiled a catalog of focal mechanisms for events that occurred between 1960 and 1984 with M> 6 and depth between 40 and 200 km. The final catalog includes 335 events with 47 new focal mechanisms, and is probably complete for earthquakes with mB 6.5. For events with M 6.5, nearly 48% of the events had no aftershocks and only 15% of the events had more than five aftershocks within one week of the mainshock. -
The Sub-Crustal Stress Field in the Taiwan Region
Terr. Atmos. Ocean. Sci., Vol. 26, No. 3, 261-268, June 2015 doi: 10.3319/TAO.2014.12.04.01(T) The Sub-Crustal Stress Field in the Taiwan Region Robert Tenzer1, * and Mehdi Eshagh 2 1 The Key Laboratory of Geospace Environment and Geodesy, School of Geodesy and Geomatics, Wuhan University, Wuhan, China 2 Department of Engineering Science, University West, Trollhättan, Sweden Received 22 May 2014, revised 3 December 2014, accepted 4 December 2014 ABSTRACT We investigate the sub-crustal stress in the Taiwan region. A tectonic configuration in this region is dominated by a col- lision between the Philippine oceanic plate and the Eurasian continental margin. The horizontal components of the sub-crustal stress are computed based on the modified Runcorn’s formulae in terms of the stress function with a subsequent numerical differentiation. This modification increases the (degree-dependent) convergence domain of the asymptotically-convergent series and consequently allows evaluating the stress components to a spectral resolution, which is compatible with currently available global crustal models. Moreover, the solution to the Vening Meinesz-Moritz’s (VMM) inverse isostasy problem is explicitly incorporated in the stress function definition. The sub-crustal stress is then computed for a variable Moho geometry, instead of assuming only a constant Moho depth. The regional results reveal that the Philippine plate subduction underneath the Eurasian continental margin generates the shear sub-crustal stress along the Ryukyu Trench. Some stress anomalies asso- ciated with this subduction are also detected along both sides of the Okinawa Trough. A tensional stress along this divergent tectonic plate boundary is attributed to a back-arc rifting. -
MANILA BAY AREA SITUATION ATLAS December 2018
Republic of the Philippines National Economic and Development Authority Manila Bay Sustainable Development Master Plan MANILA BAY AREA SITUATION ATLAS December 2018 MANILA BAY AREA SITUATION ATLAS December 2018 i Table of Contents Preface, v Administrative and Institutional Systems, 78 Introduction, 1 Administrative Boundaries, 79 Natural Resources Systems, 6 Stakeholders Profile, 85 Climate, 7 Institutional Setup, 87 Topography, 11 Public-Private Partnership, 89 Geology, 13 Budget and Financing, 91 Pedology, 15 Policy and Legal Frameworks, 94 Hydrology, 17 National Legal Framework, 95 Oceanography, 19 Mandamus Agencies, 105 Land Cover, 21 Infrastructure, 110 Hazard Prone Areas, 23 Transport, 111 Ecosystems, 29 Energy, 115 Socio-Economic Systems, 36 Water Supply, 119 Population and Demography, 37 Sanitation and Sewerage, 121 Settlements, 45 Land Reclamation, 123 Waste, 47 Shoreline Protection, 125 Economics, 51 State of Manila Bay, 128 Livelihood and Income, 55 Water Quality Degradation, 129 Education and Health, 57 Air Quality, 133 Culture and Heritage, 61 Habitat Degradation, 135 Resource Use and Conservation, 64 Biodiversity Loss, 137 Agriculture and Livestock, 65 Vulnerability and Risk, 139 Aquaculture and Fisheries, 67 References, 146 Tourism, 73 Ports and Shipping, 75 ii Acronyms ADB Asian Development Bank ISF Informal Settlers NSSMP National Sewerage and Septage Management Program AHLP Affordable Housing Loan Program IUCN International Union for Conservation of Nature NSWMC National Solid Waste Management Commission AQI Air Quality Index JICA Japan International Cooperation Agency OCL Omnibus Commitment Line ASEAN Association of Southeast Nations KWFR Kaliwa Watershed Forest Reserve OECD Organization for Economic Cooperation and Development BSWM Bureau of Soils and Water Management LGU Local Government Unit OIDCI Orient Integrated Development Consultants, Inc. -
Visualization of the Geophysical Settings in the Philippine Sea Margins by Means of GMT and ISC Data
Central European Journal of Geography and Sustainable Development 2020, Volume 2, Issue 1, Pages: 5-15 ISSN 2668-4322, ISSN-L 2668-4322 https://doi.org/10.47246/CEJGSD.2020.2.1.1 Visualization of the geophysical settings in the Philippine Sea margins by means of GMT and ISC data Polina Lemenkova* Ocean University of China, College of Marine Geo-sciences, 238 Songling Rd, Laoshan, 266100, Qingdao, Shandong, China; [email protected] Received: 22 February 2020; Revised: 12 March 2020; Accepted: 20 March 2020; Published online: 25 March 2020 _________________________________________________________________________________________________________________________ Abstract: The presented research aimed to perform geophysical modelling (gravity and geoid) and to evaluate the spatio-temporal variation of the marine geological data (distribution and depth of earthquakes) using combination of the Generic Mapping Tools (GMT) and available sources from the International Seismological Centre (ISC-EHB) that produce data on earthquakes as part of seismic survey and regional research projects. The target study area is a Philippine Sea basin (PSB) with two focused marginal areas: Philippine Trench and Mariana Trench, two hadal trenches located in the places of the tectonic plates subduction. Marine free-air gravity anomaly in the PSP shows higher values (>80 mGal) of the gravity fields structure at the volcanic areas and Philippine archipelago. Current study presented comparative geophysical analysis, and mapping free-air gravity and geoid in the Philippine Sea basin area. As a result of this study, the average level of earthquakes located in the Philippine Trench and Mariana Trench areas were compared, and those located in the Philippine archipelago are determined to be in the souther-western part (area of west Mindanao, south-west Visayas islands), while Luzon Islands shown shallower located earthquakes. -
Philippine Sea Plate Inception, Evolution, and Consumption with Special Emphasis on the Early Stages of Izu-Bonin-Mariana Subduction Lallemand
Progress in Earth and Planetary Science Philippine Sea Plate inception, evolution, and consumption with special emphasis on the early stages of Izu-Bonin-Mariana subduction Lallemand Lallemand Progress in Earth and Planetary Science (2016) 3:15 DOI 10.1186/s40645-016-0085-6 Lallemand Progress in Earth and Planetary Science (2016) 3:15 Progress in Earth and DOI 10.1186/s40645-016-0085-6 Planetary Science REVIEW Open Access Philippine Sea Plate inception, evolution, and consumption with special emphasis on the early stages of Izu-Bonin-Mariana subduction Serge Lallemand1,2 Abstract We compiled the most relevant data acquired throughout the Philippine Sea Plate (PSP) from the early expeditions to the most recent. We also analyzed the various explanatory models in light of this updated dataset. The following main conclusions are discussed in this study. (1) The Izanagi slab detachment beneath the East Asia margin around 60–55 Ma likely triggered the Oki-Daito plume occurrence, Mesozoic proto-PSP splitting, shortening and then failure across the paleo-transform boundary between the proto-PSP and the Pacific Plate, Izu-Bonin-Mariana subduction initiation and ultimately PSP inception. (2) The initial splitting phase of the composite proto-PSP under the plume influence at ∼54–48 Ma led to the formation of the long-lived West Philippine Basin and short-lived oceanic basins, part of whose crust has been ambiguously called “fore-arc basalts” (FABs). (3) Shortening across the paleo-transform boundary evolved into thrusting within the Pacific Plate at ∼52–50 Ma, allowing it to subduct beneath the newly formed PSP, which was composed of an alternance of thick Mesozoic terranes and thin oceanic lithosphere. -
Contrasting Morphological Trends of Islands in Central Philippines: Speculation on Their Origin
The Island Arc (2000) 9, 627–637 Thematic Article Contrasting morphological trends of islands in Central Philippines: Speculation on their origin GRACIANO P. YUMUL JR,1* CARLA B. DIMALANTA,1,2 RODOLFO A. TAMAYO JR 1,3 AND JENNY ANNE L. BARRETTO1 1Rushurgent Working Group, National Institute of Geological Sciences, College of Science, University of the Philippines, Diliman, 1101, Quezon City The Philippines, (email: [email protected]), 2Ocean Research Institute, University of Tokyo, Tokyo, Japan, 3UMR 6538 Domaines Océaniques, Université de Bretagne Occidentale, Brest, France Abstract The Palawan microcontinental block collided with the Philippine Mobile Belt in the Central Philippine region resulting in the counterclockwise rotation of Mindoro– Marinduque and clockwise rotation of Panay. The collision also brought about the clock- wise rotation of north-east Negros, Cebu, north-west Masbate and Bohol (collectively called the Western Visayan block), resulting into their present-day northeast–southwest trend. This suggests a far more dramatic role of the collision than was previously recog- nized. Furthermore, the south-east Sulu Sea sub-basin is inferred to have also undergone collision-related clockwise rotation which can account for the observed east-west trending magnetic lineations in the basin. Aside from explaining the contrasting morphological trends of the different islands in Central Philippines, the rotation can also explain, albeit in a different way, how the belts of sedimentary basins, ophiolites and arcs in Panay and Negros can extend to Northern Luzon. Published paleomagnetic data suggest that the collision-related rotation commenced during the early to middle Miocene and had ceased by the late Miocene. -
Geochemistry and Tectonic Setting of the Luzon Arc, Philippines
Geochemistry and tectonic setting of the Luzon arc, Philippines MARC J. DEFANT Department of Geology, University of South Florida, Tampa, Florida 33620 RENE^C^^AUR^Y } laboratoire de Petrologie et G. S. Oceanologie et Geodynamique, Universite de Bretagne Occidentale, 29287 Brest, France JELLE DE BOER Department of Earth and Environmental Sciences, Wesleyan University, Middletown, Connecticut 06457 JEAN-LOUIS JORON Groupe des Sciences de la Terre, Laboratoire Pierre Siie, Centre d'Etudes Nucléaires de Saclay, B.P. 2, 91191 Gif sur Yvette, France ABSTRACT ment) with the Manila Trench. In contrast, unreported analytical data, along the entire ex- Babuyan segment samples (north) have un- tent of the Luzon arc and to discuss possible Miocene (10 Ma) to Recent volcanism is usual island-arc Nd and Sr isotopic ratios that origins of these compositional variations. associated with eastward subduction along fall below the mantle array; they appear to be the Manila Trench for some 1,200 km from the result of sediment source contaminants or GEOLOGIC SETTING the Coastal Range in Taiwan south to Min- a unique mantle composition. Incorporation doro. We suggest calling this the "Luzon of sediments analyzed from eastern China Tectonic Framework arc." There are five distinct segments along and Taiwan into a MORB-type mantle can this arc: Mindoro, Bataan, Northern Luzon, explain the Nd and Sr isotopic ratios of the The Manila Trench is a broadly arcuate Babuyan, and Taiwan. The Bataan and Min- Babuyan segment. (concave eastward) structure, which extends doro segments in the south are separated by a from about 13° to 21° N (Figs. -
The Plate Tectonics of Cenozoic SE Asia and the Distribution of Land and Sea
Cenozoic plate tectonics of SE Asia 99 The plate tectonics of Cenozoic SE Asia and the distribution of land and sea Robert Hall SE Asia Research Group, Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Email: robert*hall@gl*rhbnc*ac*uk Key words: SE Asia, SW Pacific, plate tectonics, Cenozoic Abstract Introduction A plate tectonic model for the development of SE Asia and For the geologist, SE Asia is one of the most the SW Pacific during the Cenozoic is based on palaeomag- intriguing areas of the Earth$ The mountains of netic data, spreading histories of marginal basins deduced the Alpine-Himalayan belt turn southwards into from ocean floor magnetic anomalies, and interpretation of geological data from the region There are three important Indochina and terminate in a region of continen- periods in regional development: at about 45 Ma, 25 Ma and tal archipelagos, island arcs and small ocean ba- 5 Ma At these times plate boundaries and motions changed, sins$ To the south, west and east the region is probably as a result of major collision events surrounded by island arcs where lithosphere of In the Eocene the collision of India with Asia caused an the Indian and Pacific oceans is being influx of Gondwana plants and animals into Asia Mountain building resulting from the collision led to major changes in subducted at high rates, accompanied by in- habitats, climate, and drainage systems, and promoted dis- tense seismicity and spectacular volcanic activ- persal from Gondwana via India into SE Asia as well