By Georgina Elustondo
A strong earthquake of magnitude 7.5 recorded off the northeast coast of Japan triggered tsunami warnings in that country and generated immediate concern among residents of the west coast of the United States. However, US authorities were clear: there is no tsunami threat for California after the event.
The earthquake occurred in front of the Sanriku region this Monday, April 20, an area with a long seismic history in Japan. After the earthquake, Japanese agencies activated preventive warnings for several coastal prefectures due to the possibility of dangerous waves.
But on the other side of the Pacific, the message was different.
You can see: Earthquake projections in 2026: what geographers and seismologists anticipate
What they said in the United States
The Nationwide Tsunami Warning Center (NTWC) reported that, after analyzing the earthquake, there is no tsunami alert, warning, watch or threat in effect for California or the West Coast of the United States.
This means that coastal flooding, abnormal currents or relevant impacts on beaches, ports or cities on the Californian coast are not expected.
Why an earthquake in Japan raises doubts in California
The worry is not irrational. Large earthquakes in Japan can generate tsunamis that cross the Pacific, as occurred in previous historical events.
The most remembered case is 2011 Japan earthquake and tsunamiwhich produced devastating local damage and also abnormal waves in California, especially in ports such as Crescent Metropolis and Santa Cruz.
Therefore, every time there is a strong earthquake in Japan, many California residents check to see if there is a risk.
The key difference this time
Not all earthquakes generate powerful tsunamis. For a transoceanic threat to exist, the following usually influence:
- Depth of the earthquake.
- Type of geological rupture.
- Vertical displacement of the seabed.
- Exact location.
- Energy released into the ocean.
In this case, US monitoring centers concluded that there are no conditions for a dangerous impact in California.
What official alerts mean
Many times the word “alert” generates confusion. In tsunami systems there are different levels:
- Warning: Serious risk of coastal flooding. May require evacuation.
- Advisory: Strong currents and dangerous waves near the water.
- Read (Surveillance): Possible risk under evaluation.
- Data Assertion: No threat; It is reported for public tranquility.
For California, what happened after this earthquake was essentially a confirmation of no threat.
What California residents should do
There are no special actions required for this event. The authorities recommend only following official sources and avoiding fake chains or old videos on social networks that usually circulate after international earthquakes.
Continue reading:
Did Baba Vanga predict World War III in 2026? What AI says
They develop houses that rise during earthquakes: the ideally suited solution in a seismic country
