EMB ERJ 140 ER/LR
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Declared Emergency
Aircraft
Departing runway 18L; above 80kts received a Caution EICAS message and captain stated 'continue'. In the climb; we began to receive intermittent 'IAS' comparator alerts on PFD 1 & 2 airspeed indicators. Continued the departure climb to 10;000 feet at which time the difference in airspeeds continually got more substantial. During this time we also received intermittent 'SPS Advanced' Cautions. We ran the 'Unreliable Airpseed' checklist; decided to return to [departure airport]; declared an emergency. The captain briefed the flight attendant and we landed flaps 45 degrees; below max landing weight.  Cause: Apparent issue with pitot-static system.
EMB-140 First Officer reported loss of multiple pitot/static related components.