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Late Pleistocene to Holocene environmental changes from ¿13C determinations in soils at Teotihuacan, Mexico

Abstract: Stable carbon isotopic signature (δ13C) of soil organic matter (SOM) is used as a high-spatial resolution tool to infer environmental changes during late Pleistocene to Present in the Teotihuacan valley, Mexico. Interpretation was based on climatic pre

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Lacunarity of geophysical well logs in the Cantarell oil field, Gulf of Mexico

Abstract: Lacunarity and fractal variations in geophysical well logs are associated with stratigraphic and petrophysical properties of the naturally fractured Cantarell field in the Gulf of Mexico. Neutron porosity (NPHI), density (RHOB, DRHO, PEF), resistivity (LLD,

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Crustal thickness beneath Rio de Janeiro, Brazil, from spectra of SH waves at station RDJ
Felipe Dias Cario Jorge Luis de Souza

Abstract: Amplitude and phase spectra of long period analog S wave records were used to estimate crustal thickness under Rio de Janeiro seismic station. Earthquakes with shallow focal depths (10-33 km) and epicentral distances varying from 83 to 88 degrees provided t

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Seismic velocity structure of the Guerrero gap, Mexico

Abstract: A two-dimensional velocity structure of the Guerrero gap was obtained by applying a damped least square method to hypocenters of local seismicity recorded by a telemetric network situated on the Guerrero coast, above Cocos plate subduction zone. The region

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Cooling rate effects on the magnetization of volcanic rocks: Some implications for paleointensity determination

Abstract: Effects of variation of cooling rate in the acquisition of thermoremanent magnetization (TRM) are analyzed on a suite of volcanic rocks. We use a three-step cooling rate experimental procedure applied at three distinct temperatures of TRM acquisition. Sixte

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