Check out the visibility metric to understand better the graphics presented in this page.
This graph shows the visibility of a given network (such is explained at chilean's networks visibility study) calculated each 5 minutes between 25/02/2010 and 02/03/2010
This graph shows the number of paths from a RIPE/RIS collector to a given network between 25/02/2010 and 02/03/2010.
Disclaimer: The visibility indicator graph show us the state of the network block for the given IP address. The visibility indicator shows the changes of visibility on time for the given IP block. It is normal to see numbers of visibility and announced below 100% for large blocks. What does matter about the graphics is to see the earthquake day should have behave the same way the others day (i.e. the indicators have to be stable on time). On average we see that most of the networks have values bellow normal days after the 27-Feb. If you search by a domain name, we lookup by the actual IP address, which could be different than the IP address associated to the domain name in the day of the earthquake.
More info?, please check the chilean's networks visibility study