She began her career at the
University of Nevada as a geological consultant to Professor David B. Slemmons, who conducted research in earthquake geology and engineering. Slemmons and Korringa discovered two large ash-flow sheets in the
Eureka Valley Tuff near
Bridgeport, California, along with a smaller overlying unit of ash-flow
tuff. This finding confirmed the suggested correlation of the volcanic rock
quartz latite in this area. At the University of Nevada, she also worked with Donald C. Noble regarding volcanic petrology in North America and Peru. This is where her interest in active faults and
landslides started. In
Mono County, California, they evaluated strontium and lead isotopic data, finding that the obsidian from Glass Mountain was the result of fractional crystallization. Noble and Korringa continued their research by studying calcium variations in whole-rock and glass samples from Quaternary lavas in
Crater Lake, Oregon. Korringa joined
Woodward-Clyde Consultants, a civil, geotechnical and environmental engineering and construction firm, where she researched active faulting. In the Alyeska fault study for the
Trans-Alaska Pipeline System, she was the central, leading participant. She co-authored numerous reports for the company, her most noteworthy being the Alyeska fault study's "Basis for Pipeline Design for Active-Fault Crossings for the Trans-Alaska Pipeline." In the two years that Marjorie worked with Woodward-Clyde Consultants, she became chairman of the Geology-Seismology-Geophysics Planning Committee. She was headed for significant managerial responsibility, as she "influenced almost every phase of their geologic practice." By the time of her death in 1974, she had a principal role in designing the extent of evaluation, along with the photo geological interpretation of imagery, for three projects at Woodward-Clyde: the study of a nuclear-reactor project in California, a nuclear-reactor siting in Italy, and the
Managua earthquake and its faults for the Nicaraguan government. == Personal life ==