Banning or blocking trolls

An anonymous user has been posting fake earthquake alerts several times a day for the past 2 weeks, as well as other fake "disasters". They get reported and taken down quickly, but its annoying to chose between no notifications and 5 fake notifications every day. Is there a way to specifically report repeated trolling on the neighborhood app, or to block anonymous users?Why is someone who has had made probably 30+ fake posts still allowed to post? Is there no system to assess problem users based on reports?