Browse search results by year feature
This is based on the significant earthquake archives, where users can view a year of significant eqs at a time. https://earthquake.usgs.gov/earthquakes/browse/significant.php
This could make it easier to browse a potentially larger search, and move through one year or month at a time. Maybe these would be presets to start, for significant earthquakes or product types? Or as an alternative when searches exceed the 20k limit?