Magnitude 7.4 Earthquake Strikes Drake Passage
A powerful magnitude 7.4 earthquake struck off Chile’s southern coast early Friday, shaking the Drake Passage between Cape Horn and Antarctica. The United States Geological Survey reported the earthquake at a shallow depth of 10 kilometres. The quake occurred at 09:58 local time (12:58 GMT), around 219 kilometres from Ushuaia, Argentina. Authorities quickly issued a tsunami alert for coastal regions in both Chile and Argentina.
Figure 1: A 7.4 magnitude earthquake strikes Drake Passage
Evacuations Begin in Magallanes and Antarctic Territory
Chile’s disaster agency, SENAPRED, issued an evacuation order for the Magallanes region and the Chilean Antarctic Territory. President Gabriel Boric posted on X, “We call for evacuation of the coastline throughout the Magallanes region.” Over 1,700 people moved to higher ground in the sparsely populated region. Evacuees included 1,000 residents from Puerto Williams and 500 from Puerto Natales. Sirens sounded across towns as residents calmly evacuated.
Figure 2: People evacuating to higher ground after a tsunami alert in Chile
Tsunami Alert Extends to Argentina’s Southern Tip
The quake also prompted action in Argentina’s Tierro del Fuego region. Authorities evacuated around 2,000 people from coastal areas. Ushuaia, the world’s southernmost city, felt the tremors most significantly. The Argentine civil protection agency confirmed that the earthquake affected other towns to a lesser extent.
Estado de Precaución para toda la Región de Magallanes y la Antártica Chilena. Este estado se establece cuando existe amenaza de un tsunami menor con afectación limitada sobre la zona costera.@Senapred solicita abandonar zonas de playas, orillas rocosas, desembocaduras de ríos,… pic.twitter.com/bYdMRIuzWf
— Gobierno de Chile (@GobiernodeChile) May 2, 2025
Instrumental Tsunami Recorded in Antarctica
Alicia Cebrian, SENAPRED director, confirmed an instrumental tsunami at Chile’s Prat Base in Antarctica. “A variation of 6cm in sea level” was recorded, she said. She added that sea level variations of up to 90cm could occur. Chile’s Hydrographic and Oceanographic Service estimated that waves would reach Antarctica first. Southern Chilean cities would follow within hours. The Chilean Antarctic Institute confirmed evacuations from research bases. SENAPRED reported 32 people moved from Antarctic bases during the alert.
Emergency Measures Activate Across Chile
Chile’s national alert system initiated its highest level of disaster warning. The warning allowed authorities to mobilise all available resources. Interior Minister Alvaro Elizalde addressed the public later in the day. He said the evacuation alert for the region had been downgraded. However, he advised people to “stay away from the beach and coastal regions.”
Calm Response as Sirens Sounded
Videos on social media captured the public’s calm reaction during evacuations. In Puerto Williams, sirens echoed through the streets as people moved to higher ground. Police posted footage of an officer pushing a resident in a wheelchair uphill. Evacuation points across the Magallanes region filled with students, workers and other residents. Parks became gathering spots as part of the emergency protocol.
Tsunami warning sirens in Puerto Williams, Chile
People are moving to higher ground after 7.4 Earthquake. pic.twitter.com/ImLCnigJzW— Disasters Daily (@DisastersAndI) May 2, 2025
Chile Faces Frequent Seismic Activity
Chile sits at the convergence of three tectonic plates. The region experiences regular seismic activity as a result. The country remains one of the most earthquake-prone in the world. The depth and location of Friday’s quake increased concerns about a potential tsunami. The government responded swiftly with coordinated evacuations.
No Damage or Injuries Reported
Despite the magnitude of the earthquake, no injuries or damage to critical infrastructure occurred. SENAPRED confirmed that the evacuation was a precaution. The agency praised the public’s cooperation and calm response. Residents followed safety instructions and moved swiftly to designated safe zones.
Continued Monitoring in Affected Regions
Authorities continue to monitor the situation across southern Chile and Antarctica. Coastal surveillance remains active while tsunami risks persist. Chile’s Hydrographic and Oceanographic Service continues issuing updates. Waves are still expected to impact remote regions along the southern coast. SENAPRED advised all residents to remain alert and follow official guidance.
Figure 3: Authorities continue to monitor the situation across southern Chile and Antarctica
Precautionary Measures Remain in Place
While the evacuation alert has been downgraded, officials urge continued caution. President Boric reaffirmed the state’s commitment to public safety. “All of the state’s resources would be made available to deal with any impact,” he said. Emergency personnel remain on standby in affected areas.
International Monitoring Supports Local Response
Global seismic agencies, including the US Geological Survey, continue monitoring the quake’s aftereffects. The shallow depth of 10 kilometres raised tsunami concerns across the region. Local and international agencies continue to cooperate in data sharing. This coordination supports accurate forecasting and rapid alerts.
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Public Cooperation Acknowledged by Authorities
Officials commended the public’s adherence to evacuation procedures. SENAPRED highlighted the importance of preparedness in seismic regions. Chile’s early warning systems helped reduce risks during Friday’s emergency. Authorities reminded residents to stay informed and prioritise safety.
Summary
A 7.4 magnitude earthquake struck the Drake Passage, prompting tsunami alerts across southern Chile and Argentina. Authorities evacuated over 3,700 people from vulnerable areas. Chile’s government activated top-level disaster protocols and deployed resources. No injuries or damage were reported. Coastal monitoring continues as officials urge caution in affected areas.
