Comparisons to Chernobyl are premature - we don't have a basis.
Once we know how much fuel is damaged (breached), i.e., the source term, then we can start to determine the amount of radioactivity released. Then we can compare to Chernobyl.
Please be patient. We all want to know.
BTW -this might have been mentioned elsewhere, but -
Mag 6.2 in Eastern Honshu, Japan!
Date-Time Tuesday, March 15, 2011 at 13:31:46 UTC
Tuesday, March 15, 2011 at 10:31:46 PM at epicenter
Location: 35.300°N, 138.700°E
Depth: 10 km (6.2 miles) set by location program
Region
Distances:
36 km (22 miles) S of Kofu, Honshu, Japan
37 km (22 miles) NW of Numazu, Honshu, Japan
42 km (26 miles) NNE of Shizuoka, Honshu, Japan
116 km (72 miles) WSW of TOKYO, Japan
http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc00023fx.php#maps