Citations with the tag: SEISMIC refraction method
Results 1 - 50
- Seismic imaging of hotspot-related crustal underplating beneath the Marquesas Islands.
Caress, David W.; McNutt, Marcia K. // Nature; 2/16/1995, Vol. 373 Issue 6515, p600
Reports the results of seismic refraction experiments across the Marquesas Islands hotspot trace. Crust underlying island chain; Seismic velocities indicative of crustal underplating in large lower-crustal region; Occurrences of wide-angle reflections.
- University uses a seismic upgrade to enhance the learning environment.
Knecht, Barbara // Architectural Record; May2002, Vol. 190 Issue 5, p284
Focuses on the seismic retrofit of the Wurster Hall building in Berkeley, California. Vulnerability of the building to earthquakes; History of the building; Illustration of the building structure.
- Facets, contracts, history of non-exclusive, high-efficiency surveying.
Elrod, Doug; Walker, Robin // Offshore; Mar2000, Vol. 60 Issue 3, p30
Part I. Focuses on the business of non-exclusive seismic data as used by the geophysical industry. Rules and restrictions on the use of non-exclusive data; History of seismic exploration methodology; Concerns over the global shift to the non-exclusive model in three-dimensional seismic...
- Seismic Refraction Tomography of Mae-Hia Landfill Sites, Mueang District, Chiang Mai.
Wongpornchai, Pisanu; Phatchaiyo, Ronnachai; Srikoch, Napakom // World Academy of Science, Engineering & Technology; Aug2009, Issue 32, p678
The groundwater contamination from the unmanaged abandoned landfill site creates many problems to the community surrounding the landfill site. An abandoned landfill site in Mae-Hia Sub-district, Mueang District, Chiang Mai Province is an example of the unmanaged landfill site. Remedial work of...
- Identification of sinkhole development mechanism based on a combined geophysical study in Nahal Hever South area (Dead Sea coast of Israel).
Ezersky, Michael; Legchenko, Anatoly; Camerlynck, Christian; Al-Zoubi, Abdallah // Environmental Geology; Sep2009, Vol. 58 Issue 5, p1123
Seismic refraction, magnetic resonance sounding (MRS), and the transient electromagnetic (TEM) method were applied to investigate the geological and hydrogeological conditions in the Nahal Hever South sinkhole development area at the Dead Sea (DS) coast of Israel. Microgravity and MRS results...
- Formation of oceanic crust at slow spreading rates: New constraints from an extinct spreading...
Louden, K.E.; Osler, J.C. // Geology; Sep96, Vol. 24 Issue 9, p771
Presents a joint analysis of seismic reflection and refraction profiles across an extinct spreading center in the Labrador Sea. Reductions in crustal thickness; Velocity across the rift; Rotated fault blocks.
- History of sedimentation in Isfjord (Western Spitsbergen).
Levitan, M. A.; Levchenko, O. V.; Murdmaa, I. O.; Peresypkin, V. I.; Roshchina, I. A.; Tolmacheva, A. V. // Lithology & Mineral Resources; Nov2008, Vol. 43 Issue 6, p520
Lithology, heavy mineral associations, and chemical composition of sediments studied in two gravity cores from Isfjord, Western Spitsbergen, accompanied by high-frequency seismic records, provide a new insight on the provenance and glaciomarine sedimentation in the fjord from the last...
- Geological, Soil and Rock Mass Evaluation for Proposed Hydroelectric Power Plant at Sennar Dam, Sudan.
Ez Eldin, M. A. M.; Huiming, Tang; Bahwi, N. H.; Faraw, A. G. // Journal of Applied Sciences; 2007, Vol. 7 Issue 22, p3477
A feasibility study by using geological, geotechnical and geophysical investigations (VES and seismic refraction) have been carried out for construction a new hydroelectric power plant at Sennar Dam situated at Selma State, 350 km south of Khartoum (the capital of Sudan). As a consequence of the...
- Crustal Structure Along the Lawrencepur-Astor Profile in the Northwest Himalayas.
Bhukta, Subrata K.; Sain, K.; Tewari, H. C. // Pure & Applied Geophysics; Jul2006, Vol. 163 Issue 7, p1257
During the Pamir Himalayan project in the year 1975 seismic refraction and wide-angle reflection data were recorded along a 270 km long Lawrencepur-Astor (Sango Sar) profile in the northwest Himalayas. The profile starts in the Indus plains and crosses the Main Central Thrust (MCT), the Hazara...
- Grain-size distribution and subsurface mapping at the Setiu wetlands, Setiu, Terengganu.
Yaacob, Rosnan; Mustapa, Mohd Zaini // Environmental Earth Sciences; May2010, Vol. 60 Issue 5, p975
A study was carried out around the lagoon and coastal area of Setiu wetlands to determine the general characteristics and grain-size distribution of their sediments. Sediment samples were collected from 39 stations of the lagoon area and 8 stations of the coastal area, and were analyzed for...
- Identification of cross-valley faults in the Maynardville Limestone, Oak Ridge Reservation, Tennessee, using seismic refraction tomography.
Atre, Shashank; Carpenter, Philip // Environmental Earth Sciences; May2010, Vol. 60 Issue 6, p1245
First arrival times from P-wave refraction and reflection seismic surveys along Bear Creek Valley on the Oak Ridge Reservation, Tennessee, were inverted to produce refraction tomographic velocity images showing seismic velocity variations within thinly mantled karstic bedrock to a depth of...
- Determination of Seismic Wave of Consolidated Granite Rock in Penang Island: Ultrasonic Testing Method Vs Seismic Refraction Method.
Musa, Mohd Hafiz; Adli, Zulfadhli Hasan; Arifin, M. N. Khairul // World Academy of Science, Engineering & Technology; Nov2010, Issue 47, p994
No abstract available.
- Lithospheric structure of the Trans-Hudson Orogen from seismic refraction - wide-angle reflection studies.
Németh, Balázs; Clowes, Ron M.; Hajnal, Zoltan // Canadian Journal of Earth Sciences; Apr2005, Vol. 42 Issue 4, p435
The Trans-Hudson Orogen (THO) is the world's largest Paleoproterozoic orogenic belt. Data from three refraction profiles are used to investigate its lithospheric structure in Saskatchewan and Manitoba. R1 crosses the orogen from the Hearne craton on the west to the Superior craton on the east;...
- Constraints on the composition of the crust and uppermost mantle in northwestern Canada: Vp/Vs variations along Lithoprobe's SNorCLE transect.
Fernández-Viejo, Gabriela; Clowes, Ron M.; Welford, J. Kim // Canadian Journal of Earth Sciences; Jun2005, Vol. 42 Issue 6, p1205
Shear-wave seismic data recorded along four profiles during the SNoRE 97 (1997 Slave â€“ Northern Cordillera Refraction Experiment) refraction â€“ wide-angle reflection experiment in northwestern Canada are analyzed to provide S-wave velocity (Vs) models. These are combined with...
- Crustal structure and lithology of the northern Canadian Cordillera: alternative interpretations of SNORCLE seismic reflection lines 2a and 2b.
Evenchick, Carol A.; Gabrielse, Hubert; Snyder, David // Canadian Journal of Earth Sciences; Jun2005, Vol. 42 Issue 6, p1149
Seismic reflectors at shallow crustal levels recorded in SNORCLE (Slave â€“ Northern Cordillera Lithospheric Evolution) lines 2a and 2b in the northern Canadian Cordillera can be reconciled with many stratigraphic and structural elements known from geological mapping. Clearly evident...
- Seismic reflection-based evidence of a transfer zone between the Wagner and Consag basins: implications for defining the structural geometry of the northern Gulf of California.
González-Escobar, Mario; Suárez-Vidal, Francisco; Hernández-Pérez, José; Martín-Barajas, Arturo // Geo-Marine Letters; Dec2010, Vol. 30 Issue 6, p575
This study examines the structural characteristics of the northern Gulf of California by processing and interpreting ca. 415 km of two-dimensional multi-channel seismic reflection lines (data property of PetrÃ³leos Mexicanos PEMEX) collected in the vicinity of the border between the Wagner and...
- Hydro-geophysical Investigation Using Seismic Refraction Tomography to Study the Groundwater Potential of Ahmadu Bello University Main Campus, within the Basement Complex of Northern Nigeria.
OSUMEJE, Joseph Orojah; KUDAMNYA, Ebenezer Agayina // Journal of Environment & Earth Science; 2014, Vol. 4 Issue 2, p15
The investigation was carried out at the built up area of Ahmadu Bello University, main campus samara, Zaria. In order to map the ground water potential structure of the area a seismic refraction tomography method was used. The compressional seismic wave (P-wave) velocity variations provided...
- Seismic Refraction Prospecting for Groundwater: A Case Study of Golden Heritage Estate, Ogun State.
Adeoti, L.; Alile, O. M.; Uchegbulam, O.; Adegbola, R. B. // Research Journal of Physics; 2012, Vol. 6 Issue 1, p1
The seismic refraction investigation was carried out using the seismograph and it involved twenty-two profiles spread over three traverses with 24 spreads per profile along the major path that passes through the Golden Heritage Estate. A distance of 72 m per profile was utilized for seismic...
- Applying Seismic Refraction Method in Depicting Geological Contact at Bukit Bunuh, Lenggong, Perak, Malaysia.
Ali, Nisa'; Saad, Rosli; Saidin, M. Mokhtar; Nordiana, M. M. // International Proceedings of Chemical, Biological & Environmenta; 2012, Vol. 36, p59
The study objective is to delineate geological contact for subsurface geological structure. The study area situated at Bukit Bunuh, Lenggong, Perak, Malaysia, covered 8km long with West-East direction. A combination of 62 seismic spread with 115m each spread, data acquisition conducted using...
- The Application of Geophysical Methods in Foundation Failure Investigation a Case Study of Metro Hostel, Camp Area, Abeokuta, South Western Nigeria.
Coker, J. O.; Makinde, V.; Mustapha, A. O.; Adesodun, J. K. // Nature & Science; 2013, Vol. 11 Issue 11, p103
This study was carried out to assess the causes(s) of the foundation failure of the Metro Hostel Building opposite Mechanic Village, Camp Area, Abeokuta, Nigeria, using combined geophysical techniques which comprises of Vertical electrical sounding (VES) and Seismic Refraction methods. The major...
- APPLICATION OF FINITE-DIFFERENCE REFRACTION MIGRATION TO STUDY OF THE EARTH CRUST STRUCTURE.
Verpakhovska, Oleksandra; Pilipenko, Vitalii; Pylypenko, Elena // Proceedings of the International Multidisciplinary Scientific Ge; 2012, Vol. 2, p545
Migration is one of the important procedures of a seismic data processing because gives an image of the deep geological structure from original observed wave fields. Reflected waves usually are basic for the migration procedures, but wide-angle data are observed at large offsets where it is...
- New geophysical and geological evidence for the present day southernmost active deformational front of the Rif thrust-and-fold belt and the oceanic accretionary prism of Cadiz: the Dhar Doum-Lalla Zahra fault, Northwestern Atlantic Coastal Morocco.
Toto, E.; El Miloudi, A.; El Basri, M.; Hafid, M.; Zouhri, L.; El Mouraouah, S.; Benammi, M.; El Mouraouah, A.; Iben Brahim, A.; Birouk, A.; Kasmi, M. // Environmental Earth Sciences; Dec2012, Vol. 67 Issue 8, p2411
Combining the results from field observations, high resolution 2D-electric resistivity and high resolution seismic refraction tomography, we have found new evidence for active faulting in the Dhar Doum area, northwestern Atlantic coast of Morocco. Qualitative interpretation of the inverted...
- Crustal velocity structure of the southern Nechako basin, British Columbia, from wide-angle seismic traveltime inversion.
Stephenson, A.L.; Spence, G.D.; Wang, K.; Hole, J.A.; Miller, K.C.; Clowes, R.M.; Harder, S.H.; Kaip, G.M.; Mareschal, Jean-Claude // Canadian Journal of Earth Sciences; Jun2011, Vol. 48 Issue 6, p1050
In the BATHOLITHS onland seismic project, a refraction - wide-angle reflection survey was shot in 2009 across the Coast Mountains and Interior Plateau of central British Columbia. Part of the seismic profile crossed the Nechako Basin, a Jurassic-Cretaceous basin with potential for hydrocarbons...
- Applicability of time-lapse refraction seismic tomography for the detection of ground ice degradation.
Hilbich, C. // Cryosphere Discussions; 2010, Vol. 4 Issue 1, p77
The article presents a study which examines the applicability of time-lapse refraction seismic tomography (RSTM) as valuable method for detecting ground ice degradation in the Swiss Alps, Switzerland. It mentions that ground ice degradation is observed through electrical resistively tomography...
- Segmentation and melt supply at the southwest Indian Ridge.
Muller, Mark S.; Minshull, Timothy A. // Geology; Oct99, Vol. 27 Issue 10, p867
Studies the seismic refraction of Southwest Indian Ridge. Modeling of the seismic velocity along three segments; Melt generation and delivery focused along the segment midpoints; Anomalous thin crust caused by restricted melt generation.
- Tracing of the Avenue of the Ram-Headed Sphinxes Remains Using Geophysical Investigations, Luxor, Egypt.
Basheer, Alhussein A.; Abdel-motaal, Abdelnasser M.; El-Kotb, Ahmed; Taha, Ayman I.; Abdalla, Mohammed A. // International Journal of Geosciences; Jul2014, Vol. 5 Issue 8, p785
Throughout 3000 years ago, over the New Kingdom in the Pharaonic period, the Ram-headed Sphinxes Avenue connected Karnak and the Temples of Luxor, a processional avenue was lined on both sides by 1200 statues of sphinxes. The lining of the avenue was erased. Centuries over centuries this avenue...
- The 13 November 2007 rock-fall at Viale Tiziano in Rome (Italy).
Amanti, M.; Chiessi, V.; Guarino, P. M. // Natural Hazards & Earth System Sciences; 2012, Vol. 12 Issue 5, p1621
The aim of the study was to perform a study on the western slope of the Monti Parioli hill (Rome, Italy) affected by frequent rock-fall phenomena, such as the one that occurred on 13 November 2007. This goal was achieved by defining a detailed reconstruction of the stratigraphical, geological...
- Contribution to the Integrated Interpretation of Gravity, Aeromagnetic and Seismic Data of the Northern and Central Parts of Sinai, Egypt.
El-Khadragy, Ali; Ahmad, A. Azab; Ahmed, A. EI-Khafeef // World Applied Sciences Journal; 2014, Vol. 31 Issue 9, p1540
Bouguer gravity and aeromagnetic maps and Landsat structural lineaments were used to delineate the structural pattern and tectonics of the northern and central parts of Sinai Peninsula. Processing of the available potential field data includes, regional-residual separation, second vertical...
- Deep crustal structure of the Northeast German basin: New DEKORP-BASIN '96 deep-profiling results.
El-Khadragy, Ali; Ahmad, A. Azab; Ahmed, A. EI-Khafeef // Geology; Jan99, Vol. 27 Issue 1, p55
Reports on the integrated reflection and refraction seismic survey across the Permian-Cenozoic Northeast German basin which yielded insights on the evolution of intracontinental basins. Background geology; Results of vertical-incidence profiles; Sedimentary cover; Basement; Moho.
- The crustal structure of the southern Nain and Makkovik provinces of Labrador derived from refraction seismic data.
Hansen, Annette K.; Reid, Ian D.; Louden, Keith E.; Funck, Thomas // Canadian Journal of Earth Sciences; Apr2008, Vol. 45 Issue 4, p465
Data from a refraction seismic profile parallel to the coast of Labrador (Canada) were used to determine the crustal structure across the boundary of the Nain and Makkovik provinces, and to look for evidence for an offshore continuation of the Mesoproterozoic Nain Plutonic Suite (NPS). Seven...
- Seismic refraction profiles in the Gulf of Saint Lawrence and implications for extent of continuous Grenville lower crust.
Jackson, H R // Canadian Journal of Earth Sciences; Jan2002, Vol. 39 Issue 1, p1
Near the exposed Grenville craton, a two-layer crust with velocities of 6.2 km s[sup â€“1] and 6.65 km s[sup â€“1] and low gradient is measured. The 6.65 km s[sup â€“1] velocity is observed at the shallow depth of 15 km and the Moho at greater than 40 km depth. Towards the...
- Delineation of the Seawater-Freshwater Interface from the Coastal Alluvium of KalekÃ¶y-GÃ¶kÃ§eada, NW Turkey.
Ekinci, Yunus Levent; Demirci, Alper; Ertekin, Can // Journal of Applied Sciences; 2008, Vol. 8 Issue 10, p1977
In this study, combined geophysical methods were perfomled to determine layered seawater-freshwater interface which is under natural conditions through a semipervious layer in a coastal alluvium of GÃ¶kÃ§eada-Turkey. The surveyed area named KalekÃ¶y is located in the northeastern part of...
- Joint inversion of high resolution seismic reflection data and seismic refraction tomography model to illuminate the very near surface structures.
Chiemeke, Collins C.; Modebe, Chioma N. // Advances in Applied Science Research; Apr2012, Vol. 3 Issue 2, p1158
Information within less than 50 ms of seismic reflection data are often masked by surface wave. These amplitude and velocity information within this region are needed to delineate the very near surface structure and for proper static correction of reflection seismic data. This research was...
- Application of Geophysical Method in Engineering and Environmental Problems.
Jusoh, Zuriati; Nawawi, M. N. M.; Saad, Rosli // AIP Conference Proceedings; 7/7/2010, Vol. 1250 Issue 1, p181
Geophysical surveys (2-D resistivity imaging and seismic refraction) were conducted in Tanjung Tokong, Penang and Gunung Keriang, Kedah. Tanjung Tokong is a reclaimed area which is under construction for building 24 floors moderate apartment. Subsurface boulders and unknown materials in...
- A Combination of Electrical Resistivity and Seismic Refraction Surveys for Ground Water Exploration in Basement Region of Ifon, Ondo State, Nigeria.
Egbai, J. C. // Australian Journal of Basic & Applied Sciences; 2011, Vol. 5 Issue 5, p1007
A geophysical survey employing seismic refraction and vertical electrical soundings were carried out in parts of Ifon town and environs using a 24 channel seismograph and Abem Terrameter model SAS 1000B with inbuilt booster. The VES has a maximum current electrode separation of 700m. The result...
- Delineation of aquiferous layers within the basement complex using joint inversion of seismic refraction tomography and high resolution 3D seismic reflection survey.
Chiemeke, Collins C.; Aboh, H. O. // Archives of Applied Science Research; 2012, Vol. 4 Issue 1, p400
Zaria, where this Survey was carried out is located in the basement complex of North Central Nigeria. It consists of Precambrian rocks types made up of granite, gneisses and low grade metasediment. The gneiss and the low grade metasediment forms the country rock into which the granitic batholith...
- SEISMIC REFRACTION PROFILING AND VERTICAL ELECTRICAL SOUNDING FOR GROUND WATER STUDY IN OBIARUKU, DELTA STATE NIGERIA.
Egbai, J. C.; Aigbogun, C. O. // International Journal of Research & Reviews in Applied Sciences; 2012, Vol. 10 Issue 2, p339
Seismic refraction profiling and Vertical Electrical Sounding (VES) were adopted in Obiaruku, the Head-quarter of Ukwuani local Government Area of Delta State, Nigeria for the purpose of delineating the groundwater potentials in the sedimentary region of the area. The instrument used are the 24...
- Seismic Blasting Project Approved for Death Valley.
Egbai, J. C.; Aigbogun, C. O. // National Parks; Mar/Apr88, Vol. 62 Issue 3/4, p10
Reports that the U.S. National Park Service has given permission to the U.S. Department of Energy to conduct a seismic refraction survey of Death Valley National Monument. Determination of the structure of the substrata rock and ensure that radioactive wastes dumped at Yucca Mountain, Nevada,...
- Seismic Refraction Survey to Investigate Shallow Sediments of Wadi Thuwal, North of Jeddah, KSA.
Al-Garni, Mansour A.; El-Behiry, Mohamed G. // Journal of King Abdulaziz University: Earth Sciences; Jan2011, Vol. 22 Issue 1, p57
A seismic refraction survey was conducted along 32 seismic profiles, to study the near-surface sediments and to delineate the level of the water table in Wadi Thuwal area, which is located 110 km to the north of Jeddah, KSA. Processing and interpretation of seismic data established a...
- S-Wave Velocity Distribution of the Northern Isparta Urban Area With the Method of Seismic Refraction Microtremor (ReMi).
Kanbur, Zakir; Kanbur, S�veyla // Journal of Natural & Applied Sciences; 2009, Vol. 13 Issue 2, p156
The refraction-microtremor (ReMi) method has been recently developed to obtain average shear wave velocity (Vs30) at the depth of 30 m. In both UBC (Uniform Building Code) and EC8 (Eurocode 8), soil classification is carried out by analyzing the Vs30 values. The Isparta urban area, under high...
- Use of geophysical methods for soil profile evaluation.
Groves, Paul; Cascante, Giovanni; Dundas, Dave; Chatterji, P.K. // Canadian Geotechnical Journal; Sep2011, Vol. 48 Issue 9, p1364
A geophysical investigation was performed to evaluate the effectiveness of three geophysical methods (electrical resistivity imaging (ERI), seismic refraction (SR), and multiple-channel analysis of surface waves (MASW)) for geotechnical site characterization in swamps and environmentally...
- SÄ±ÄŸ Sismik YansÄ±ma, MASW ve ReMi YÃ¶ntemleri ile SÄ±ÄŸ YapÄ±larÄ±n Ä°ncelenmesi: Isparta YerleÅŸim Merkezi Kuzeyi Pliyo-Kuvaterner Ã‡Ã¶kel YapÄ± Ã¶Ã–rneÄŸi.
Kanbur, Mehmet Zakir; Silahtar, Ali; Özsoy, Can // Journal of Natural & Applied Sciences; 2011, Vol. 15 Issue 3, p224
Shear (S) wave velocities and seismic sections derived from MASW, ReMi and shallow seismic reflection techniques are compared with an existing 8 m depth cliff. The techniques were performed along with Plio-Quaternary aged unconsolidated and partly consolidated sediments of the the study area in...
- Depth-Recursive Tomography of the Bohemian Massif at the CEL09 Transect-Part B: Interpretation.
Novotný, Miroslav // Surveys in Geophysics; Mar2012, Vol. 33 Issue 2, p243
In the accompanying paper (Part A), depth-recursive tomography was applied to the CEL09 refraction data. A deblurred P-wave velocity image was obtained down to a depth of 20 km. This paper (Part B) is devoted to the interpretation of the upper- and middle-crustal structures of the Bohemian...
- Ground stability assessment using geophysics and field observation techniques.
Al-Saigh, N.; Al-Dabbagh, Th. // Environmental Earth Sciences; Jul2012, Vol. 66 Issue 6, p1597
Inspection of ground stability is necessary to ensure the suitability of an area for engineering and environmental applications. In a certain area, a combination of measurement of cracks and seismic refraction method can provide a better knowledge of the future behavior of the area in terms of...
- Seismic landslide analysis: Gurpinar (Istanbul) as a case history.
Ozcep, Ferhat; Erol, Engin; Saraçoğlu, Fatih; Haliloğlu, Mustafa // Environmental Earth Sciences; Jul2012, Vol. 66 Issue 6, p1617
Slope failures triggered by earthquakes are among the most important soil mechanics problems. In this study, static and pseudostatic analyses of slope stability for earthquake conditions were carried out in the Gurpinar area. In situ testing (SPT) was carried out and laboratory samples were...
- Variable unroofing in the western Superior Province - metamorphic evidence and possible origin.
Hynes, Andrew; Zixin Song // Canadian Journal of Earth Sciences; Jul2006, Vol. 43 Issue 7, p805
Western Superior Lithoprobe seismic-reflection line 1 exhibits a broad region of northward-dipping reflectors in the Uchi subprovince, which gives way to southward-dipping reflectors farther north in the Berens River sub province. Mafic metavolcanic rocks across the region of northward-dipping...
- Insight into the Crustal Structure of the Eastern Marmara Region, NW Turkey.
Bekler, Tolga; Gurbuz, Cemil // Pure & Applied Geophysics; Feb2008, Vol. 165 Issue 2, p295
In order to investigate crustal structure beneath the eastern Marmara region, a seismic refraction survey was conducted across the North Anatolian Fault (NAF) zone in north west Turkey. Two reversed profiles across two strands of the NAF zone were recorded in the Armutlu Highland where a...
- Paleoproterozoic subduction in northwestern Canada from near-vertical and wide-angle seismic reflection data.
Oueity, Jounada; Clowes, Ron M. // Canadian Journal of Earth Sciences; Jan2010, Vol. 47 Issue 1, p35
Near-vertical incidence and refraction â€“ wide-angle reflection seismic data, recorded as part of Lithoprobe studies in the Paleoproterozoicâ€“Archean domains of Canadaâ€™s Northwest Territories, show remarkable reflections from within the upper mantle. A parallel pair of...
- A Constrained 3D Density Model of the Upper Crust from Gravity Data Interpretation for Central Costa Rica.
Lücke, Oscar H.; Götze, Hans-Jürgen; Alvarado, Guillermo E. // International Journal of Geophysics; 2010, p1
The map of complete Bouguer anomaly of Costa Rica shows an elongated NW-SE trending gravity low in the central region. This gravity low coincides with the geographical region known as the Cordillera VolcÃ¡nica Central. It is built by geologic and morphotectonic units which consist of...
- Contrasting seismic characteristics of three major faults in northwestern Canada.
Snyder, David B.; Roberts, Brian J.; Gordey, Steven P. // Canadian Journal of Earth Sciences; Jun2005, Vol. 42 Issue 6, p1223
The Lithoprobe Slave â€“ Northern Cordillera Lithospheric Evolution (SNORCLE) profiles crossed three major tectonic zones of the northwestern Canadian Shield and northern Canadian Cordillera that are diverse in age and in depth of penetration. The oldest (2630â€“2590 Ma), the...