An important aspect of the Next Generation Attenuation for Central and Eastern North America (NGA-East) project led by the Pacific Earthquake Engineering Research Center (PEER) entails assigning seismic wave attenuation values to major crustal regions. In this study, Central and Eastern North America (CENA) is subdivided into four regions based on the geologic and tectonic setting. The regions are the Central North America (CNA), the Appalachian Province (APP), the Atlantic Coastal Plain (ACP), and the Mississippi Embayment/Gulf Coast region (MEM). Each region is described by a statistically representative crustal seismic velocity-depth structure and Q-factor model. The crustal structure models are for very hard rock conditions and do not include any sediments. The four regions are shown in the figure below. The largest region is Central North America (CNA) and the others are, following a clockwise order, the Appalachian Province (APP), the Atlantic Coastal Plain (ACP), and the Mississippi Embayment/Gulf Coast region (MEM).
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