Earthquake Notification Service
After the magnitude 9.0 Tohoku earthquake on March 11, 2011, a change was made in ENS to enable the 'aftershock exclusion' feature by default. This filters out notifications for all but the largest aftershocks, eliminating the large deluge of aftershock notifications after a large mainshock.
In addition, aftershock exclusion has been turned ON for all accounts. If you would like to turn 'aftershock exclusion' back OFF, (thereby potentially receiving a large number of aftershock notifications), please login to your ENS account and do this from the 'Account Preferences' tab on the main ENS webpage.