Click on any number in the image below to learn more about how to use the map.



1 - Information window

The information window will display when a users clicks inside a quadrangle or red box on the map.  The descriptive information displayed inside the window is related to that particular AP map.


Screenshot of an information window for a Alquist-Priolo Earthquake Fault Zone Map.


Below is a description for each of the values that are displayed inside the information window for each map.

Quadrangle Name:The name of the Alquist-Priolo Earthquake Fault Zone Map (same as the 1:24,000 scale USGS quadrangle name).
Revised:(N=No, Y=Yes) Specifies whether or not there was a revision made
Current Date:The last date at which this quadrangle map was officially released.
Prior Dates:Prior dates this quadrangle map was officially released.
Counties:Counties that are overlapping or inside the quadrangle map.
Cities:Cities that are affected.
A/P Map:PDF document of the AP Quadrangle Map.
GIS Data:ZIP file that contains the GIS data for the AP Quadrangle Map.


2 - Navigation controls


3 - Changing views