ESS Distinguished speaker Dr. Suzan van der Lee looks at Lithosheric Structure This Week
EES Distinguished Speaker series welcomes Dr. Suzan van der Lee, Northwestern University. Her topic this week: "Lithospheric Structure of the North-American Mid-continent Rift"
For two and a half years the Superior Province Rifting Earthscope Experiment (SPREE) collected passive seismic data alongside USArray’s Transportable Array along, across, and around the North-American Mid-continent Rift from Lake Superior to Iowa. This seismic data was analyzed in different ways to image the structure of the lithosphere in this study region. The manlte lithosphere looks relatively heterogeneous. The crust on the other hand, shows structures that are remarkably correlated with the Mid-continent Rift. The analysis further shows that the compressional forces that caused the post-rifting uplift that is responsible for the high gravity highs along the rift occurred in a largely NW-SE direction, causing more uplift along favorably oriented segments of the rift and less uplift, accomapnied by lateral motion, along less favorably oriented rift segments. This implies that the Belle-Plaine fault zone incurred its offsets most likely during post-rift compression rather than during rifting.
Come join us for this deep dive into the North American Mid-Continent Rift on Friday, Janaury 26, 2018 at 12:30 PM in Room 204, Natural Science Buidling on the East Lansing campus.