matric potential

matric potential . The absolute value of the gage pressure head of water in an unsaturated material. It is inversely proportional to water saturation. By convention, the gage is set to read zero at atmospheric pressure.

#42: Exploring publishing trends in GEOPHYSICS

In this episode, host Andrew Geary speaks with Ioan Vlad on his article in The Leading Edge analyzing over 80 years of affiliation information for articles published in GEOPHYSICS. Mr. Vlad examines long-term publishing trends in GEOPHYSICS, including affiliation information and geographic trends. Using Python, statistics, and visual analysis, he explores how understanding these trends could be valuable both for institutional decision making and for individual career planning. Show notes and links at Biography

Don’t just stand there… do something!

This blog is part of a series addressing issues further explored in GSA’s Pardee Session Women Rising: Removing Barriers and Achieving Parity in the Geosciences.  Attend the Women Rising session, 1:30 – 5:30 p.m., Monday, November 5, Sagamore Ballroom 5, Indianapolis Convention Center, Indianapolis, followed by a networking social, 5:30 – 7:00 p.m.​

By Blair Schneider, PhD, University of Kansas Center for Teaching Excellence, Lawrence KS

Science as a family affair

All five children in the Weiss family of Huntington Beach, Calif., have presented their research at American Geophysical Union (AGU) meetings. AGU’s Bright Students Training as Research Scientists (Bright STaRS) program — as well as the mentorship of their science teacher and the support of their parents — made it possible.

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AEG: Bentley on geo-visualization

Association of Environmental & Engineering Geologists

D.C. – Maryland – Virginia Chapter (

Thursday, September 20, 2018, from 5:30 PM to 8:00 PM at Amphora Restaurant in Vienna, VA.

AEG Members $40, Non-members $45 (includes dinner; student and retiree discounts available). Please register by Monday, September 17, via online payment (

How good is what?

Geology is a descriptive science, which is to say, geologists are label-makers. We record observations by assigning labels to data. Labels can either be numbers or they can be words. As such, of the numerous tasks that machine learning is fit for attacking, supervised classification problems are perhaps the most accessible – the most intuitive – for geoscientists. Take data that already has labels. Build a model that learns the relationships between the data and labels. Use that model to make labels for new data. The concept is the same whether a geologist or an algorithm is doing it, and in both cases we want to test how well our classifier is at doing its label-making.

Albers projection

Albers projection (Al'-bers). An equal-area projection of the conical type, on which the meridians are straight lines that meet in a common point beyond the limits of the map and the parallels are concentric circles whose center is at the point of intersection of the meridians. Meridians and parallels intersect at right angles and the arcs of longitude along any given parallel are of equal length. The parallels are spaced to retain the condition of equal area. Along two selected parallels, called standard parallels, the scale is held exact; along the other parallels the scale varies with latitude, but is constant along any given parallel. Between the standard parallels the meridional scale is too large; beyond them, too small. When used for the map of the U.S., the projection normally has a maximum scale error of 1.25 percent along the northern and southern borders (Snyder, 1987, p.27). Named after Heinrich C. Albers (1773-1833), German cartographer, who devised the projection in 1805. Syn: Albers equal-area conic projection.


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