Apparent Attenuation Beneath the United States and its Correlation to Lithospheric Provinces

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Apparent Attenuation Beneath the United States and its Correlation to Lithospheric Provinces

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Kowalke, Sara

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2016-09

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Thesis or Dissertation

Abstract

We map apparent attenuation beneath the continental United States through time-domain waveform analysis of 19 deep-focus teleseismic events recorded by the USArray Transportable Array. Results show good correlation with lithospheric boundaries. Low t* is common across the cratonic continent and high t* regions dominate in the western U.S. and east of the Appalachian front. Some geographic variations are not consistent with expectations, such as relatively low t* in the North Basin and Range. Comparisons with additional techniques, including heat flow, tomography, and seismicity, indicate regional influence of non-thermal attenuation factors. Different lithospheric provinces have distinct attenuation signatures that assist in understanding the behavior of the lithospheric continent.

Keywords

Attenuation

Continental behavior

Lithospheric provinces

Seismology

United States

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University of Minnesota M.S. thesis. September 2016. Major: Earth Sciences. Advisor: Maximiliano Bezada. 1 computer file (PDF); iv, 36 pages.

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Kowalke, Sara. (2016). Apparent Attenuation Beneath the United States and its Correlation to Lithospheric Provinces. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/191263.

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