Active disaster relief organization?

I've been looking to find an active disaster relief organization that I could apply for for any future disasters such as earthquake, flood, etc. I've been looking around online but the only organizations I see are for Touhoku earthquake relief and any updates were a bit outdated. I'm watching the news right now and see flooding that hit hard.
I want to sign up for any volunteering I can do actively as much as I can in Japan as I can speak Japanese and have many loved ones in Japan.
I'm really passionate about volunteering and I have some experiences volunteering at other countries.
Please, if you know any very active volunteer organizations for any future disaster relief, let me know.
I am an American citizen. I can speak Japanese well (My kanji is little lacking but speaking wise, I have no problem). I'm a university graduate.

Peace Boat Disaster Relief Volunteer Center is constantly recruiting volunteers, not just for the Tohoku earthquake but for other disasters including flooding. Their English website does not list every location/activity they are carrying out, so if your Japanese is at an advanced level, check out the Japanese language page.

http://pbv.or.jp/

It's Not Just Mud :

http://itsnotjustmud.com/

Kansaigaijin,

If you mean you want to go to new disaster points, it's usually more practical to focus on the specific location rather than a organization.

For example, which flood are you talking about? Usally the municipal's website has the most updated information on volunteering.

Thank you so much. I will definitely look into those organizations!