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JULY 2019 | VOLUME 29, NUMBER 7
SCIENCE

4 Synoptic View of Lithospheric S-Wave Velocity
Structure in the Southern United States:
A Comparison of 3D Seismic Tomographic Models
GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news
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April is a combined issue). GSA TODAY is published by The Cover: Map view of four recent seismic shear wave models of the southern U.S. at 5 km above the
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Geological Society of America Inc. (GSA) with offices at Moho, plotted as perturbations with respect to the same average 1D model. Solid black lines represent
3300 Penrose Place, Boulder, Colorado, USA, and a mail-
ing address of P.O. Box 9140, Boulder, CO 80301-9140, USA. a proposed rift and transform fault system. The southern U.S. has relatively low seismicity compared
GSA provides this and other forums for the presentation to western and northeastern North America, so few local earthquakes are available for imaging, and
of diverse opinions and positions by scientists worldwide, there have historically been few seismic stations to record distant earthquakes as well. These results
regardless of race, citizenship, gender, sexual orientation, were made possible by EarthScope’s Transportable Array. See related article, p. 4–10.
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