The GS seminar is this Thursday, October 20 at 3:15 in Hubbs 4500. We
are fortunate to hear from Dr. Seulgi Moon from the Department of
Earth, Planetary, and Space Sciences at UCLA. Dr. Moon's primary
research areas are in Geochemistry and Cosmochemistry, Geology and
Tectonics. Her presentation for us is titled: Uplift, stress, and
erosion: Tectonic controls on landscape evolution.
Here’s a brief abstract:
The interactions between tectonics, climate, chemical and physical
processes on Earth drive landscape evolution. Characterizing these
interactions is central to understanding past and future landscape
change. In this talk, I present two stories that show how tectonic
processes control landscape evolution. First, I investigate how
spatial and temporal variation in tectonic uplift rates influences
erosion rates from surface processes. My study in the Mendocino Triple
Junction region shows that the erosion rates increase with tectonic
uplift rates, but can be imbalanced due to a lagged response in
hillslopes and tributaries. Second, I show how tectonics and
topography may influence the distribution of subsurface bedrock
fractures. Applying a model of three-dimensional topographic stresses
to three sites with different tectonic regimes, I find a strong
correspondence between modeled stress and observed seismic velocities.
This suggests that topographic stresses influence near-surface bedrock
fractures, which in turn should alter patterns of weathering,
erodibility, and groundwater flow.
Her research on this topic was published recently in /Science/.
is a link to the paper: http://science.sciencemag.org/content/350/6260/534
We will have coffee, tea and some light snacks available at 3:00 for
Hope you can make it!