Click on the composite photo to go to the interactive version on Google's site.
From the "Memories for the Future" site:
To help people in Japan share their photographs and videos that did survive the tsunami, Google created a website, “Mirai e no kioku” (text is in Japanese only), which means “Memories for the Future”. Through this site, people have been able to rediscover lost memories of their homes and towns.
Google is now also providing thousands of miles of Street View imagery in the affected areas that were collected before and after the disaster.
msnbc.com original PhotoBlog series "After the Wave"
PhotoBlog images from the tsunami.