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

If you want to check your settings or turn 'aftershock exclusion' off, (thereby potentially receiving a large number of aftershock notifications) you can log in to your ENS account and do this from the 'Account Preferences' tab on the main ENS webpage

Thank you, Earthquake Notification Service Team

This is an administrative message from the U S Geological Survey Earthquake Notification Service https://sslearthquake usgs gov/ens/

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