SEISMIC HAZARD

This grid theme shows the relative shaking 
intensities of the Circum-Pacific region, 
as indicated by the value of peak ground 
acceleration, in centimeters per second 
squared.  Areas have a 10 percent chance 
of exceedence within 50 years, and an 
almost 100 percent chance over 475 years.  
Brown and red areas are likely to 
experience extreme shaking intensities, 
and green areas are likely to experience 
low shaking intensities.  The data are 
from the Global Seismic Hazard Assessment 
Program (1999).