No. Registros Solicitud 1 5614 colombia

CP - COUNTRY OF PUBLICATION: France

PY - PUBLICATION YEAR: 1990

CN - CONFERENCE INFORMATION: 13e reunion des sciences de la terre. Grenoble, France. April 2-4, 1990.

LA - LANGUAGE: French

DE - DESCRIPTORS: Colombia-; fractional-crystallization; igneous-rocks; magmas-; Nevado-del-Ruiz; regression-analysis; South-America; statistical-analysis; volcanic-rocks; volcanoes-

CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France

IS - ISSN: 0249-7557

CO - CODEN: RASTCW

AN - ACCESSION NUMBER: 1997-045548

UD - UPDATE CODE: 199716

Registro 3896 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Structural effect of Magdalena Fan deposition on the northern Colombia convergent margin.

AU - AUTHORS: Breen-Nancy-A

AF - AUTHOR AFFILIATION: Lamont-Doherty Geol. Obs., Palisades, NY, United States

SO - SOURCE: Geology (Boulder). 17; 1, Pages 34-37. 1989.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 1989.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: English

DE - DESCRIPTORS: accretion-; Atlantic-Ocean; block-structures; Caribbean-Plate; Caribbean-region; Caribbean-Sea; Colombia-; continental-margin; deep-sea-sedimentation; geophysical-methods; geophysical-surveys; Magdalena-Delta; Magdalena-Fan; North-Atlantic; oceanography-; plate-convergence; plate-geometry; plate-tectonics; sedimentation-; sedimentation-rates; seismic-methods; South-America; structural-controls; submarine-fans; surveys-; tectonophysics-; uplifts-

CC - CATEGORY CODES: 07-Oceanography; 18-Solid-earth-geophysics

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N093000; N120000; LONG: W0740000; W0770000.

NN - ANNOTATION: Lamont-Doherty Geol. Obs., Contrib. No. 8628.

IL - ILLUSTRATION: Refs: 25; illus. incl. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0091-7613

CO - CODEN: GLGYBA

AN - ACCESSION NUMBER: 1989-024523

UD - UPDATE CODE: 1989

Registro 3897 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Inclusion of the month; "spiro" in emerald.

AU - AUTHORS: Themelis-Ted

AF - AUTHOR AFFILIATION: Gemlab, Clearwater, FL, United States

SO - SOURCE: Lapidary Journal. 42; 12, Pages 19. 1989.

PB - PUBLISHER: Lapidary Journal, Inc.. San Diego, CA, United States. 1989.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: English

DE - DESCRIPTORS: Colombia-; emerald-; fluid-inclusions; genesis-; inclusions-; mineralogy-; minerals-; Muzo-Mine; patterns-; popular-geology; ring-silicates; silicates-; South-America; torsion-

CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0023-8457

CO - CODEN: LAJOA6

AN - ACCESSION NUMBER: 1989-035534

UD - UPDATE CODE: 1989

Registro 3898 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Rb-Sr and K-Ar evidence for the presence of a 1.6 Ga basement underlying the 1.2 Ga Garzon-Santa Marta granulite belt in the Colombian Andes.

AU - AUTHORS: Priem-H-N-A; Kroonenberg-Salomon-B; Boelrijk-N-A-I-M; Hebeda-E-H

AF - AUTHOR AFFILIATION: ZWO Lab. Isotopen-Geol., Amsterdam, Netherlands

BK - BOOK TITLE: In: Recent advances on the Precambrian geology of South and Central America and the Caribbean.

BA - BOOK AUTHORS: Onstott-T-C (editor)

SO - SOURCE: Precambrian Research. 42; 3-4, Pages 315-324. 1989.

PB - PUBLISHER: Elsevier. Amsterdam, International. 1989.

CP - COUNTRY OF PUBLICATION: International

PY - PUBLICATION YEAR: 1989

CN - CONFERENCE INFORMATION: Recent advances on the Precambrian geology of South and Central America and the Caribbean. San Antonio, TX, United States. 1986.

LA - LANGUAGE: English

DE - DESCRIPTORS: absolute-age; age-; Andes-; Archean-; basement-; Colombia-; Colombian-Andes; correlation-; dates-; Garzon-Massif; Garzon-Santa-Marta-Belt; geochronology-; granulites-; Grenvillian-Orogeny; Guyana-Shield; K-Ar; metamorphic-rocks; petrology-; Precambrian-; Rb-Sr; South-America

CC - CATEGORY CODES: 05A-Igneous-and-metamorphic-petrology; 03-Geochronology

DT - DOCUMENT TYPE: Serial; Conference-Document

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 36; illus. incl. 4 tables, geol. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0301-9268

CO - CODEN: PCBRBY

AN - ACCESSION NUMBER: 1989-041180

UD - UPDATE CODE: 1989

Registro 3899 de 5614 - GeoRef Disc 3: 1985-1992

BK - BOOK TITLE: Sedimentary structures and textures of Rio Orinoco channel sands, Venezuela and Colombia.

BA - BOOK AUTHORS: McKee-Edwin-D

BF - BOOK AUTHOR AFFILIATION: U. S. Geol. Surv., USA, United States

SO - SOURCE: U. S. Geological Survey Water-Supply Paper. Pages B1-B23. 1989.

NT - NOTES: Prepared in cooperation with Venezuelan Ministerio del Ambiente y de los Recursos Naturales Renovables

PB - PUBLISHER: U. S. Geological Survey. Reston, VA, United States. 1989.

RP - RESEARCH PROGRAM: USGS (Publications of the U. S. Geological Survey)

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: English

AB - ABSTRACT: The majority of the sedimentary structures in the channel sands of the Orinoco River are planar cross-strata that are products of sand-wave deposition. Sands in these deposits are mostly medium-grained. Eolian dunes form on top of the sand waves when they are exposed to the trade winds at low river stages. The windblown sands are typically fine-grained.

DE - DESCRIPTORS: bars-; channel-geometry; channels-; clastic-sediments; clay-; Colombia-; cross-stratification; fluvial-features; fluvial-sedimentation; geomorphology-; grain-size; hydrology-; Orinoco-River; planar-bedding-structures; point-bars; processes-; rivers-and-streams; sand-; sand-bodies; sedimentary-petrology; sedimentary-structures; sedimentation-; sediments-; silt-; size-distribution; South-America; stream-transport; surveys-; textures-; USGS-; Venezuela-

CC - CATEGORY CODES: 06A-Sedimentary-petrology; 23-Geomorphology; 21-Hydrogeology

DT - DOCUMENT TYPE: Serial; Report

BL - BIB LEVEL: Monograph

NN - ANNOTATION: The waters and sediments of the Rio Orinoco and its major tributaries, Venezuela and Colombia.

IL - ILLUSTRATION: Refs: 26; illus. incl. 5 tables, sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0886-9308

CO - CODEN: XIWSAX

RN - REPORT NUMBER: W 2326-B

AN - ACCESSION NUMBER: 1989-048378

UD - UPDATE CODE: 1989

Registro 3900 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Estudios tectonicos de la parte sur de Mexico

Translated Title: Tectonic studies of southern Mexico.

AU - AUTHORS: Scheidegger-A-E

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 17; 64, Pages 125-132. 1989.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1989.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: active-faults; Coscos-Plate; faults-; Mexico-; neotectonics-; southern-Mexico; structural-geology; tectonics-; Yucatan-Peninsula

CC - CATEGORY CODES: 16-Structural-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 12; illus. incl. 3 tables, sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1989-055094

UD - UPDATE CODE: 1989

Registro 3901 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: La obra de Pierre Bouguer en la Nueva Granada y el descubrimiento de la gravimetria

Translated Title: The works of Pierre Bouguer in Nueva Granada and the gravimeter.

AU - AUTHORS: Espinosa-B-Armando

AF - AUTHOR AFFILIATION: INGEOMINAS, Popayan, Mexico

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 17; 64, Pages 137-141. 1989.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1989.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: Spanish

DE - DESCRIPTORS: biography-; Bouguer,-Pierre; experimental-studies; geophysical-methods; gravimeters-; gravity-methods; instruments-

CC - CATEGORY CODES: 20-Applied-geophysics

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1989-055095

UD - UPDATE CODE: 1989

Registro 3902 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: A review of soil and soil-related constraints to development in Amazonia.

AU - AUTHORS: Nortcliff-Stephen

AF - AUTHOR AFFILIATION: Univ. Reading, Dep. Soil Sci., Reading, United Kingdom

SO - SOURCE: Applied Geography (Sevenoaks). 9; 3, Pages 147-160. 1989.

PB - PUBLISHER: Butterworth-Heinemann. Sevenoaks, United Kingdom. 1989.

CP - COUNTRY OF PUBLICATION: United-Kingdom

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: English

DE - DESCRIPTORS: agriculture-; Amazon-Basin; Brazil-; climate-; Colombia-; Ecuador-; environmental-geology; French-Guiana; Guyana-; land-use; Peru-; soil-surveys; soils-; South-America; Surinam-; surveys-; Venezuela-

CC - CATEGORY CODES: 22-Environmental-geology; 25-Soils

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 29; illus. incl. 8 tables, geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0143-6228

AN - ACCESSION NUMBER: 1989-056035

UD - UPDATE CODE: 1989

Registro 3903 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: African, Latin areas highlight AAPG meet.

AU - AUTHORS: McCaslin-John-C

AF - AUTHOR AFFILIATION: Oil and Gas J., Tulsa, OK, United States

SO - SOURCE: Oil and Gas Journal. 87; 29, Pages 72. 1989.

PB - PUBLISHER: PennWell. Tulsa, OK, United States. 1989.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: English

DE - DESCRIPTORS: Africa-; Angola-; Brazil-; Central-Africa; Colombia-; economic-geology; petroleum-; petroleum-exploration; South-America; Venezuela-

CC - CATEGORY CODES: 29A-Economic-geology,-geology-of-energy-sources

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0030-1388

CO - CODEN: OIGJAV

AN - ACCESSION NUMBER: 1989-058661

UD - UPDATE CODE: 1989

Registro 3904 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: The North Panama earthquake of 7 September 1882; evidence for active underthrusting.

AU - AUTHORS: Mendoza-Carlos; Nishenko-S-P

AF - AUTHOR AFFILIATION: U. S. Geol. Surv., Natl. Earthquake Inf. Cent., Denver, CO, United States

SO - SOURCE: Bulletin of the Seismological Society of America. 79; 4, Pages 1264-1269. 1989.

PB - PUBLISHER: Seismological Society of America. Berkeley, CA, United States. 1989.

RP - RESEARCH PROGRAM: USGSOP (Non-USGS publications with USGS authors)

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: English

DE - DESCRIPTORS: aftershocks-; Caribbean-Plate; Central-America; Colombia-; compression-; deformation-; earthquakes-; epicenters-; faults-; magnitude-; modified-Mercalli-scale; Nazca-Plate; North-Panama-earthquake-1882; Panama-; Panama-earthquake-1621; plate-boundaries; seismic-zoning; seismology-; seismotectonics-; South-America; tectonics-; tectonophysics-; transition-zones; tsunamis-; underthrust-faults

CC - CATEGORY CODES: 19-Seismology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

MC - MAP COORDINATES: LAT: N100000; N100000; LONG: W0780000; W0780000.

LAT: N090000; N090000; LONG: W0770000; W0770000.

IL - ILLUSTRATION: Refs: 22; illus. incl. 1 table, geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0037-1106

CO - CODEN: BSSAAP

AN - ACCESSION NUMBER: 1989-058858

UD - UPDATE CODE: 1989

Registro 3905 de 5614 - GeoRef Disc 3: 1985-1992

BK - BOOK TITLE: Sand waves, bars, and wind-blown sands of the Rio Orinoco, Venezuela and Colombia.

BA - BOOK AUTHORS: Nordin-Carl-F Jr.; Perez-Hernandez-David

BF - BOOK AUTHOR AFFILIATION: U. S. Geol. Surv., USA, United States; Minist. Ambiente y Recur. Nat. Renov., Venezuela

SO - SOURCE: U. S. Geological Survey Water-Supply Paper. Pages A1-A74. 1989.

NT - NOTES: Prepared in cooperation with Venezuelan Ministerio del Ambiente y de los Recursos Naturales Renovables

PB - PUBLISHER: U. S. Geological Survey. Reston, VA, United States. 1989.

RP - RESEARCH PROGRAM: USGS (Publications of the U. S. Geological Survey)

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: English

AB - ABSTRACT: During the low-flow season, approximately 35 percent of the bed of the Rio Orinoco is exposed. The bed is composed of medium to very coarse sand and fine gravel, and the main bed configuration is large bars composed of many sand waves. Trade winds blowing upriver may erode and transport as much as 60 M m (super 3) of sediment per yr from the exposed bed.

DE - DESCRIPTORS: aerial-photography; bars-; bedding-plane-irregularities; bedforms-; bedload-; channels-; Colombia-; fluvial-features; geomorphology-; hydrology-; low-water; Orinoco-River; rivers-and-streams; sand-waves; sedimentary-structures; sedimentation-; South-America; stream-transport; surveys-; transport-; USGS-; Venezuela-; wind-transport

CC - CATEGORY CODES: 23-Geomorphology; 21-Hydrogeology

DT - DOCUMENT TYPE: Serial; Report

BL - BIB LEVEL: Monograph

NN - ANNOTATION: The waters and sediments of the Rio Orinoco and its major tributaries, Venezuela and Colombia.

IL - ILLUSTRATION: Refs: 50; illus. incl. 1 table, sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0886-9308

CO - CODEN: XIWSAX

RN - REPORT NUMBER: W 2326-A

AN - ACCESSION NUMBER: 1989-062181

UD - UPDATE CODE: 1989

Registro 3906 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Presencia del genero Afropollis en Colombia

Translated Title: Presence of the genus Afropollis in Colombia.

AU - AUTHORS: Jimenez-Hernando-Duenas

AF - AUTHOR AFFILIATION: BIOSS, Bogota, Colombia

BK - BOOK TITLE: In: Paleobotanica e palinologia na America do Sul; 1987

Translated Title: Paleobotany and palynology of South America; 1987.

BA - BOOK AUTHORS: Oliveira-Babinski-Mary-E-C-B (editor)

SO - SOURCE: Boletim IG-USP, Publicacao Especial. 7; Pages 155-161. 1989.

PB - PUBLISHER: Universidade de Sao Paulo, Instituto de Geociencias. Sao Paulo, Brazil. 1989.

RP - RESEARCH PROGRAM: IGCP (International Geological Correlation Programme)

CP - COUNTRY OF PUBLICATION: Brazil

PY - PUBLICATION YEAR: 1989

CN - CONFERENCE INFORMATION: VI reuniao de paleobotanicos e palinologos. Sao Paulo, Brazil. Dec. 8-12, 1987.

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: Afropollis-; Albian-; Aptian-; Caballos-Formation; Cenomanian-; Colombia-; Colombria-; Cretaceous-; Gondwana-; IGCP-; Lower-Cretaceous; Magdalena-Formation; Mesozoic-; microfossils-; occurrence-; paleobotany-; palynomorphs-; South-America; Une-Formation; Upper-Cretaceous

CC - CATEGORY CODES: 09-Paleobotany

DT - DOCUMENT TYPE: Serial; Conference-Document

BL - BIB LEVEL: Analytic

NN - ANNOTATION: IGCP Project No. 237 | 242.

IL - ILLUSTRATION: Refs: 2; illus. incl. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0102-6275

AN - ACCESSION NUMBER: 1989-063313

UD - UPDATE CODE: 1989

Registro 3907 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Asociaciones palinologicas de las formaciones Colon y Molino nor-oriente colombiano

Translated Title: Palynological associations of the Colon and Molino formations, northeastern Colombia.

AU - AUTHORS: Jimenez-Hernando-Duenas

AF - AUTHOR AFFILIATION: BIOSS Ltd., Bogota, Colombia

BK - BOOK TITLE: In: Paleobotanica e palinologia na America do Sul; 1987

Translated Title: Paleobotany and palynology of South America; 1987.

BA - BOOK AUTHORS: Oliveira-Babinski-Mary-E-C-B (editor)

SO - SOURCE: Boletim IG-USP, Publicacao Especial. 7; Pages 173-181. 1989.

PB - PUBLISHER: Universidade de Sao Paulo, Instituto de Geociencias. Sao Paulo, Brazil. 1989.

RP - RESEARCH PROGRAM: IGCP (International Geological Correlation Programme)

CP - COUNTRY OF PUBLICATION: Brazil

PY - PUBLICATION YEAR: 1989

CN - CONFERENCE INFORMATION: VI reuniao de paleobotanicos e palinologos. Sao Paulo, Brazil. Dec. 8-12, 1987.

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: Catatumbo-Basin; Colombia-; Colon-Formation; Cretaceous-; floral-studies; IGCP-; Magdalena-Valley; Mesozoic-; microfossils-; Molino-Formation; northeastern-Colombia; occurrence-; paleobotany-; palynomorphs-; Proteacidites-; South-America; Spinizonocolpites-

CC - CATEGORY CODES: 09-Paleobotany

DT - DOCUMENT TYPE: Serial; Conference-Document

BL - BIB LEVEL: Analytic

NN - ANNOTATION: IGCP Project No. 237.

IL - ILLUSTRATION: Refs: 9; illus. incl. strat. col., geol. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0102-6275

AN - ACCESSION NUMBER: 1989-063315

UD - UPDATE CODE: 1989

Registro 3908 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Shear-wave anisotropy of active tectonic regions via automated S-wave polarization analysis.

AU - AUTHORS: Savage-M-K; Shih-Xiao-R; Meyer-Robert-P; Aster-R-C

AF - AUTHOR AFFILIATION: Univ. Wis., Dep. Geol. and Geophys., Madison, WI, United States

BK - BOOK TITLE: In: Fine structure and anisotropy of the lithosphere.

BA - BOOK AUTHORS: Buchbinder-G-G-R (convener); Ansorge-J (convener); Crampin-Stuart (convener)

SO - SOURCE: Tectonophysics. 165; 1-4, Pages 279-292. 1989.

PB - PUBLISHER: Elsevier. Amsterdam, Netherlands. 1989.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1989

CN - CONFERENCE INFORMATION: IUGG 19th general assembly , symposium on Fine structure and anisotropy of the lithosphere. Vancouver, BC, Canada. Aug. 12, 1987.

LA - LANGUAGE: English

AB - ABSTRACT: Using an automated "aspect ratio method" to evaluate shear-wave anisotropy from earthquakes recorded on arrays of three-component digital seismographs over the Bucaramanga nest of Colombia, the East Rift Zone of Hawaii, and the Phlegraean Fields uplift area of Italy, a shear-wave velocity anisotropy of 4-7% is observed. The anisotropy is attributed to tectonic processes acting either to align anisotropic minerals or to align stress-related cracks. At most fixed seismographs, the polarization of the leading S-phase is consistent from event to event, independent of earthquake location. On a regional basis, the polarization may vary from station to station, but a regional trend is apparent. For events from the Bucaramanga nest, Colombia, a small seismogenic volume at 160 km depth in a subducted plate, shear-wave splitting averages 0.5 +0.1 s for more than 100 events. The polarization direction of the fast shear wave is 355 degrees N+15 degrees , parallel to the strike of the Benioff zone. At the Phlegraean Fields, in Italy, which represent an active Quaternary caldera, the average shear-wave splitting observed from 51 events is 0.2 s, corresponding to a minimum velocity anisotropy of 7.

DE - DESCRIPTORS: anisotropy-; body-waves; Campania-Italy; Colombia-; crust-; East-Pacific-Ocean-Islands; elastic-waves; Europe-; Hawaii-; Italy-; lithosphere-; mantle-; neotectonics-; Oceania-; Phlegraean-Fields; plate-tectonics; polarization-; Polynesia-; properties-; S-waves; seismic-waves; seismographs-; seismology-; South-America; Southern-Europe; tectonics-; three-component-seismographs; United-States; upper-mantle; wave-dispersion

CC - CATEGORY CODES: 18-Solid-earth-geophysics; 19-Seismology

DT - DOCUMENT TYPE: Serial; Conference-Document

BL - BIB LEVEL: Analytic

NN - ANNOTATION: Univ. Wis., Geophys. and Polar Res. Cent., Contrib. No. 495.

IL - ILLUSTRATION: Refs: 33; illus. incl. 2 tables, sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from U. S. Geological Survey, Hawaiian Volcano Observatory, United States

IS - ISSN: 0040-1951

CO - CODEN: TCTOAM

AN - ACCESSION NUMBER: 1989-064355

UD - UPDATE CODE: 1989

Registro 3909 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: South American geological problems respond to European solutions.

AU - AUTHORS: Ospina-C-S

AF - AUTHOR AFFILIATION: Ingetec, Bogota, Colombia

SO - SOURCE: Tunnels and Tunnelling. 21; 5, Pages 55-58. 1989.

PB - PUBLISHER: Morgan-Grampian. London, United Kingdom. 1989.

CP - COUNTRY OF PUBLICATION: United-Kingdom

PY - PUBLICATION YEAR: 1989

LA - LANGUAGE: English

DE - DESCRIPTORS: Chingaza-Project; classification-; Colegio-Project; Colombia-; engineering-geology; Guavio-Project; properties-; rock-mechanics; Salvajina-Project; South-America; stability-; tunnels-

CC - CATEGORY CODES: 30-Engineering-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

IS - ISSN: 0041-414X

CO - CODEN: TUTUBV

AN - ACCESSION NUMBER: 1989-069163

UD - UPDATE CODE: 1989

Registro 3910 de 5614 - GeoRef Disc 3: 1985-1992

TI - TITLE: Quaternary and upper Pliocene glaciations and forest development in the tropical Andes; evidence from a long high-resolution pollen record from the sedimentary basin of Bogota, Colombia.

AU - AUTHORS: Hooghiemstra-Henry