A powerful 6.1-magnitude earthquake struck off the coast of Crete, Greece, on May 22, 2025, and sent out tsunami warnings, highlighting the importance of natural warning signs for tsunamis. Although no immediate tsunami was forthcoming, the event served as a humbling reminder of vigilance and preparedness along the coast.
Natural Warning Signs of a Tsunami
Recognizing and understanding the natural indicators of an impending tsunami is life-saving. The most important signs are:
- Ground Shaking: A major earthquake, particularly one lasting long, can signal a tsunami. If you experience such shaking close to the coastline, you should go upland right away.
- Bizarre Sea Behavior: A hasty and abrupt recession of the sea, exposing the ocean floor, reefs, and fish, typically occurs prior to the arrival of a tsunami wave. An unexpected rise in sea level also acts as a warning.
- Thundering Ocean: The tsunami may produce an extremely loud thundering noise, similar to a jet engine or train. This unusual noise is a key sound warning.
- Animal Behavior: Animals and pets are likely to act strangely prior to a tsunami, e.g., running towards higher ground or appearing fidgety. Observing such behavior may serve as a second warning.
Actions to Take Immediately
If you observe any of these warning signs:
- Do Not Wait for Official Warnings: Natural warnings may be accompanied by official ones. Action must be taken right away.
- Go to Higher Ground: Move inland and to higher ground from the shore.
- Avoid River Valleys: Tsunami waves can flow up rivers from the ocean.
- Inquire: After reaching safety, stay tuned for advice from local authorities and the emergency services.
Seismicity and Preparedness of Crete
Crete is situated in a seismically active region due to the interaction of the African and Eurasian tectonic plates. The recent earthquake that was felt throughout neighboring countries helps to emphasize the island’s vulnerability to seismic activity and potential tsunamis.
Even though there are modern warning systems, there is still a need for public awareness on natural warning signs. Individuals and visitors must be notified and trained to be prepared to act quickly in the event of impending tsunami hazards.