Data from the Earthquake Hazard Program of the USGS can be found here.
Hundreds of these aftershocks are occuring now, many are out at sea, but the 5+ MAG quakes are causing some significant trembling. While the aftershocks may not cause significant structural damage, those structures already weakened by the 8.9 quake and tsunami damage may pose hazards to rescue workers.
There are several organizations that are taking up donations to assit the victims of the quake and tsunami.
American Red Cross, Text REDCROSS to 90999 for a ten dollar donation, visit their site at redcross.org or call 800-733-2767.
Save the Children, Text JAPAN to 20222 for a ten dollar donation, visit their site at savethechildren.org/japanquake or call 800-728-3843.
Salvation Army can be reached at 800-725-2769 or visit their website at disaster.salvationarmyusa.org