Japan Issues First 'Megaquake' Advisory After 7.1 Magnitude Tremor

Authorities urge public to avoid panic buying as Prime Minister cancels diplomatic trip to oversee preparations.

Japan's weather agency warns of increased earthquake risk following recent tremors.
Public urged to refrain from hoarding essential supplies amid rising demand for disaster kits.
Prime Minister Kishida remains in Japan to ensure government readiness and communication.
Some retailers rationing bottled water and other necessities due to procurement issues.
Experts stress the elevated risk is still low, advising caution without panic.