Japan: 6.7 Quake Hits, 4th This Week; Tsunami Alert Issued

• Japan experienced a 6.7 magnitude earthquake this morning, marking the fourth significant quake this week.
• A tsunami warning for waves up to 1 meter was issued for coastal areas including Hokkaido, Aomori, Iwate, and Miyagi Prefectures.
• The series of quakes this week includes a 7.6 magnitude tremor on Monday, which injured over 50 people and caused damage.
• A "megaquake advisory" was issued after Monday's quake, warning of a potential 8.0+ magnitude earthquake in the coming week.
• No major damage has been reported from today's earthquake, but trains were halted and coastal highways closed.

Why It Matters: Japan's frequent earthquakes and megaquake advisory signal ongoing seismic danger.