Tag Archives: fieldwork

Tips for Students: fieldwork

The summer field season is rappidly approaching. If you missed it last year, check out the EGU’s Geology for Global Development mapping projects guidelines.

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Detecting Radioactive Anomalies

The low penetrating power of alpha and beta particles make them unlikely to be detected during field surveys. Instead, most radiometric surveys concentrate on detecting gamma rays. The low attenuation rate of gamma rays passing through air make both ground … Continue reading

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Detecting Density Anomalies

Gravity field surveying is a passive technique to detect gravity anomalies. Gravity is a global field that always points vertically down, with anomalies caused by very small variations in density of the underlying materials. A gravity base station measures the … Continue reading

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Detecting Porosity & Permeability

Effective porosity can be measured with electromagnetic induction probes. Hydraulic conductivity can be measured in-situ by observing water-level fluctuations in drill-holes. For a system at equilibrium, the system needs to be disturbed to produce fluid flow by either pumping water … 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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Geo-Job: On how to be a Geophysicist

I’ve written before about how I love field geophysics, and find the job to be a mix of James Bond villain meets MacGyver. The post has spawned some questions, with emails to me from proto-geophysicists asking how to get from … Continue reading

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#61 October 2013: What do you do?

I’ve been getting emails from students and proto-geos trying to understand what the practical differences of the various geoscience jobs are: how is geophysics different than geochemistry? What coursework is helpful if you’re too far along to switch majors, but … Continue reading

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Geo’s Sign

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Today, I offer a geosign for the July Accretionary Wedge created by geoscientists and geographers: Geophysical surveys involve a lot of trying to figure out where you took measurements in relation to where you want data. In mountainous, forested, cloudy … Continue reading

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GeoSigns: Tanzania

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Continuing my temporary obsession with using the July Accretionary Wedge to dig through my photo collection, the signs in Tanzania regularly made me burst out laughing. A few favourites: 1. Signs in the Wilderness Driving 6 hours from town to … Continue reading

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