What are they?
Earthquake Impact Pages summarize the significance of an earthquake in terms 'Alert' response levels;  no (green), local/regional (yellow), national (orange), or international (red) level response needed.  These levels are based on total shaking-related economic losses expected for impacted structures and their contents and non-structural damage and service disruptions, but do not include losses due to secondary earthquake affects like fire, tsunamis, etc.   Losses are estimated using the ShakeMap shaking intensities, historical and modern data about losses in past earthquakes associated with each intensity level, economic assets, and the number of people exposed to each intensity.  To derive these estimates quickly and uniformly, instead of using databases of building and facilities inventories and vulnerabilities (which don't exist in many places) to measure economic assets, more readily available data on country or region-specific market values of goods and services (the Gross Domestic Product) are used instead as proxies.

> 1 billion$ 100 million to 1 billion $ 1 to 100 million $ < 1 million $

Earthquake Impact Pages show the total population in the mapped area exposed to each shaking intensity level, using the ShakeMap intensity scale (same scale as in section above).

Earthquake Impact Pages also show the distribution of economic loss among the most affected counties and cities, in map and table formats. 

The estimated aggregate losses in each county are plotted on top of the ShakeMap, with the 10 most-impacted cities with >10,000 people noted.	A table lists each city on the map with its population and the shaking intensity it experiences noted by its numeric value and corresponding color.

 
2012 Evergreen Earthquake Exercise Example Earthquake Impact Page
An example Earthquake Impact Page for the M7.1 Tacoma Fault earthquake scenario may be viewed (right mouse button) or downloaded (left mouse button) by clicking on this link.