MESOZOIC PALEOGEOGRAPHIC EVOLUTION OF NORTHERN SOUTH AMERICA: FOUNDATIONS FOR SEQUENCE STRATIGRAPHIC STUDIES IN PASSIVE MARGIN STRATA DEPOSITED DURING NON-GLACIAL TIMES

1998 ◽  
pp. 283-318 ◽  
Author(s):  
TOMAS VILLAMIL ◽  
JAMES L. PINDELL
Keyword(s):  
South America ◽  
Passive Margin ◽  
Sequence Stratigraphic ◽  
Northern South America

scholarly journals Air quality variations in Northern South America during the COVID-19 lockdown

2020 ◽  
Vol 749 ◽  
pp. 141621 ◽  
Author(s):  
Juan F. Mendez-Espinosa ◽  
Nestor Y. Rojas ◽  
Jorge Vargas ◽  
Jorge E. Pachón ◽  
Luis C. Belalcazar ◽  
...  
Keyword(s):  
Air Quality ◽  
South America ◽  
Northern South America

Ground-motion model for subduction earthquakes in northern South America

2021 ◽  
pp. 875529302110275
Author(s):  
Carlos A Arteta ◽  
Cesar A Pajaro ◽  
Vicente Mercado ◽  
Julián Montejo ◽  
Mónica Arcila ◽  
...  
Keyword(s):  
South America ◽  
Ground Motion ◽  
Ground Motions ◽  
Strong Motion ◽  
Motion Prediction ◽  
Depth Range ◽  
Ground Motion Prediction ◽  
Natural Period ◽  
Nazca Plate ◽  
Northern South America

Subduction ground motions in northern South America are about a factor of 2 smaller than the ground motions for similar events in other regions. Nevertheless, historical and recent large-interface and intermediate-depth slab earthquakes of moment magnitudes Mw = 7.8 (Ecuador, 2016) and 7.2 (Colombia, 2012) evidenced the vast potential damage that vulnerable populations close to earthquake epicenters could experience. This article proposes a new empirical ground-motion prediction model for subduction events in northern South America, a regionalization of the global AG2020 ground-motion prediction equations. An updated ground-motion database curated by the Colombian Geological Survey is employed. It comprises recordings from earthquakes associated with the subduction of the Nazca plate gathered by the National Strong Motion Network in Colombia and by the Institute of Geophysics at Escuela Politécnica Nacional in Ecuador. The regional terms of our model are estimated with 539 records from 60 subduction events in Colombia and Ecuador with epicenters in the range of −0.6° to 7.6°N and 75.5° to 79.6°W, with Mw≥4.5, hypocentral depth range of 4 ≤  Zhypo ≤ 210 km, for distances up to 350 km. The model includes forearc and backarc terms to account for larger attenuation at backarc sites for slab events and site categorization based on natural period. The proposed model corrects the median AG2020 global model to better account for the larger attenuation of local ground motions and includes a partially non-ergodic variance model.

STUDIES ON STRONGYLOIDES AGOUTII SP. NOV. FROM THE AGOUTI (DASYPROCTA AGOUTI)

1940 ◽  
Vol 18d (5) ◽  
pp. 173-190 ◽  
Author(s):  
Henry J. Griffiths
Keyword(s):  
Seasonal Variation ◽  
South America ◽  
Biological Study ◽  
Free Living ◽  
Classical Studies ◽  
Group A ◽  
Northern South America

A morphological and biological study is presented of a hitherto unrecorded member of the genus Strongyloides from the golden-rumped agouti (Dasyprocta agouti), a rodent native to Trinidad, B.W.I., and northern South America. The name Strongyloides agoutii sp. nov. is proposed for this species.Observations on the free-living development over a period of three years showed the indirect type to prevail; no seasonal variation was observed. Continuous propagation of the free-living generation of this species was not observed in faecal cultures or on artificial media.A brief résumé of the classical studies on species of the genus Strongyloides is included, together with a summary of existing hypotheses and theories on the biology of this group. A list of species and hosts for this genus is given.

Observed warming over northern South America has an anthropogenic origin

2017 ◽  
Vol 51 (5-6) ◽  
pp. 1901-1914 ◽  
Author(s):  
Armineh Barkhordarian ◽  
Hans von Storch ◽  
Eduardo Zorita ◽  
Paul C. Loikith ◽  
Carlos R. Mechoso
Keyword(s):  
South America ◽  
Anthropogenic Origin ◽  
Northern South America

Some Conspicuous Ferns of Northern South America

1944 ◽  
Vol 34 (4) ◽  
pp. 101 ◽  
Author(s):  
Oscar Haught
Keyword(s):  
South America ◽  
Northern South America

scholarly journals Ten new species of Cladonia (Cladoniaceae, Lichenized Fungi) from the Guianas and Venezuela, South America

Phytotaxa ◽  
2013 ◽  
Vol 93 (1) ◽  
pp. 25 ◽  
Author(s):  
TEUVO AHTI ◽  
HARRIE J. M. SIPMAN
Keyword(s):  
New Species ◽  
South America ◽  
Lichenized Fungi ◽  
The Family ◽  
Northern South America ◽  
The Guianas

The diversity of the lichen family Cladoniaceae in the Neotropics is apparently underestimated. A revision of the family for the Flora of the Guianas resulted in the description of 10 species new to science from Northern South America: Cladonia cayennensis; Cladonia flavocrispata; Cladonia isidiifera; Cladonia maasii; Cladonia mollis; Cladonia persphacelata; Cladonia recta; Cladonia rupununii; Cladonia subsphacelata; Cladonia termitarum.

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