Powerful 7.6 quake rocks Japan, prompts tsunami warning

• A powerful 7.6 magnitude earthquake struck Japan.
• A tsunami warning of up to three meters (10 feet) was issued for Japan's northeastern coast.
• The tsunami warning covered Hokkaido, Aomori, and Iwate prefectures.
• The earthquake's epicenter was 80 km off Aomori prefecture, at a depth of 50 km.

Why It Matters: Japan faces immediate danger from a powerful earthquake and tsunami warning.