The police are now monitoring criminal/gang/drug 'activity' in the area.
There has been an increase in the city's (level of) economic 'activity'.
The instruments are used to detect volcanic 'activity' on the island.
(..) What appeared to be a lightning storm in space. Soon after, Starfleet received a distress signal from the Vulcan high command that their planet was experiencing seismic activity. Our mission is to assess the condition of Vulcan and assist in evacuations if necessary. (..)2009 Star Trek