Category Archives: Geoscience

Characterization of Porosity & Permeability

Porosity and permeability are closely related, so it is unsurprising that measuring the properties share common techniques that involve determining interconnected pore volume. Porosity Porosity (n) is measured as the ratio of the volume of voids within a material to … Continue reading

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Porosity and Permeability

Porosity is the number of pores per unit of volume in soil. Porosity may decrease through packing or compaction, increase through dilation during shear, or change when fines are transported from one area to another. Materials with higher porosity have … Continue reading

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Geotechnical Properties

Some physical properties of geologic materials are important in geotechnical engineering, but are not useful for geophysical interpretation. These properties are the dry strength, dilatancy plasticity, and toughness of the material. All four properties may be easily quantitatively categorized in … Continue reading

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Detecting Physical Properties (Fieldwork)

Geophysical field surveys are used to investigate the subsurface. Geophysics may utilize passive techniques, measuring and mapping changes in the ambient field, or as active techniques that measures how the geological environment responds to an input signal. In either instance, … Continue reading

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Characterizing Physical Properties (Labwork)

Measurements are made to determine the physical characteristics of geological materials. This is done by placing a homogeneous sample in specialized equipment designed to measure that particular property under either controlled or in-situ conditions. Extracting an intact sample is essential … Continue reading

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How Physical Properties relate to Geological Materials

The physical properties of geological materials are what link geophysical data gathered at the surface to interpretation of subsurface geology. These properties are determined by the microscopic and macroscopic characteristics of the materials and their environments. Measurements of physical characteristics … Continue reading

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Physical Properties of Geologic Materials

As Sedimentation Saturday was a lovely way of teaching myself more sedimentation and stratigraphy than I had previously known, for 2014, I’m taking the same route to look at the most fundamental concept in geophysics: the physical properties of geological … Continue reading

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Introductory Geology: setting a syllabus

Usually when I teach, I’m teaching an established class with a set curriculum. I’ve been part of team-taught or multi-term courses where we coordinate across topics, and I’ve taught APEG-mandatory courses designed to fulfill particular academic requirements for professional accreditation. … Continue reading

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K-Pg Extinction Event: Theories

The K-Pg boundary extinction event has several distinct characteristics that can be used to differentiate between possible causes. Supernova Cosmic radiation from a nearby supernova could be responsible for the mass extinctions and the iridium layer. However, the boundary should … Continue reading

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K-Pg Extinction Event: Boundary Characteristics

The end of the Cretaceous period and the start of the Paleogene period 65.5 million years ago is marked by a global extinction event at the K-Pg boundary. The Paleogene was previously part of the Tertiary before the term was … Continue reading

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