Columbia subject headings:
Emergency communication systems--Japan--Tōhoku Region--History--21st century.
Local mass media--Japan--Tōhoku Region--History--21st century.
Social media--Japan.
Tohoku Earthquake and Tsunami, Japan, 2011.
Harvard subject headings:
Emergency communication systems--Japan--Tōhoku Region--History--21st century.
Emergency communication systems--Japan--Tōhoku Region.
Local mass media--Japan--Tōhoku Region--History--21st century.
Local mass media--Japan--Tōhoku Region.
Social media--Japan.
Tohoku Earthquake and Tsunami, Japan, 2011
Princeton subject headings:
Emergency communication systems--Japan--Tōhoku Region.
Local mass media--Japan--Tōhoku Region.
Social media--Japan.
Tohoku Earthquake and Tsunami, Japan, 2011.