Science & Technology

WhAEM2000 BBM Files - Bighorn Crags, Idaho

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Bighorn Crags Quadrangle, Idaho. Files serve as geographic basis for groundwater modeling.

Learn about Verified Technologies for Clean Diesel

Learn about diesel retrofit technologies that EPA has approved or conditionally approved for use in engine retrofit programs.

WhAEM2000 BBM Files - Baker, Idaho

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Baker Quadrangle, Idaho. Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Ashton, Idaho

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Ashton Quadrangle, Idaho. Files serve as geographic basis for groundwater modeling.

WhAEM2000 BBM Files - Arco, Idaho

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Arco Quadrangle, Idaho. Files serve as geographic basis for groundwater modeling.

WhAEM BBM Files - Idaho

WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for quadrangles in Idaho. Files serve as geographic basis for groundwater modeling.

EPA QA/R-5, EPA Requirements for Quality Assurance Project Plans

Outlines requirements for QA plans for organizations that conduct environmental data operations for EPA through contracts, financial assistance agreements, and interagency agreements.

Single-Point Resistance Borehole Logging

single point resistance borehole logging

Electromagnetic Signal Attenuation (Skin Depth)

electromagnetic signal attenuation and skin depth

Electromagnetic Properties of Matter

the three electromagnetic properties of matter

Dielectric Permittivity

dielectric constant geophysical property

Borehole Optical Televiewer (OTV)

Borehole Optical Televiewer

Borehole Acoustic Televiewer (ATV)

Borehole Acoustic Televiewer

Seismic Velocities

If the ground is stressed by an explosion or a hammer blow, it generates three fundamental types of elastic waves: P (primary, push-pull) waves; S (secondary, shear) waves, and surface waves.

Porosity

Porosity, saturation, and density are related as a function of porosity Φ.

Seismic Reflectivity

Reflections in seismic data result from contrasts in the seismic impedance (ρV) across a boundary

Magnetic Susceptibility

Magnetic susceptibility is a measure of the ability of a material to be magnetized.

Density

Density, s, is the intrinsic unit mass of a material, defined as the mass of one cubic meter with units of kilograms per cubic meter.

Geophysical Properties

To develop a thorough understanding of the theory and science of geophysical methods requires an understanding of the geophysical properties involved in the methodology.

Electrical Methods

Electrical geophysical prospecting methods detect the surface effects produced by electric current flow in the ground.