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The Chile Drake Passage Earthquake was a magnitude 7.5 shock that occurred on 21 August 2025 off the southern coast of Chile, near the Antarctic Peninsula. The earthquake was felt in Argentina’s Tierra del Fuego region and southern cities of Chile, followed by tsunami warnings, which were later confirmed to pose no significant threat.
The earthquake was recorded by the United States Geological Survey (USGS) at 22:16 local time on 21 August 2025. The epicenter was located in the Drake Passage along the coast of Chile’s Antarctic Peninsula, at a depth of approximately 10 to 11 kilometers.
The earthquake was detected 258 to 259 kilometers northwest of Presidente Eduardo Frei Montalva Antarctic Base, Chile’s largest settlement in Antarctica. The nearest populated areas were the Argentine cities of Tolhuin and Ushuaia in Tierra del Fuego, located approximately 700 kilometers from the epicenter.
The earthquake’s magnitude was initially measured at 8.0 by the USGS and later revised to 7.5. Shaking was felt in southern regions of Chile and various cities in Argentina.
The Chilean National Emergency and Prevention System (Senapred) classified the earthquake as “moderate intensity.” To date, no fatalities or widespread damage have been reported.
Following the earthquake, the Chilean Navy Hydrography and Oceanography Service (SHOA) issued a tsunami alert for the Antarctic coast. SHOA requested the evacuation of coastal areas, rocky shorelines, wetlands, estuaries, river mouths, marinas, ports, fishing shelters, coastal roads, and piers.
Additionally, coastal strips, port areas, and shoreline zones at Chile’s Antarctic bases were evacuated. The Pacific Tsunami Warning Center (PTWC) initially reported a risk of dangerous waves but soon announced that the risk had been eliminated. It was stated that any potential waves would not exceed 0.3 meters in height.
The Chilean military implemented emergency protocols at the O’Higgins Base in Antarctica after the earthquake. It was also noted that facilities at the Presidente Eduardo Frei Montalva Base and its surroundings could potentially be affected by tsunami waves.
The earthquake occurred within the Ring of Fire, a zone known for intense seismic and volcanic activity. Thousands of earthquakes are recorded annually in Chile, most of which are of low or moderate intensity. However, the country has experienced larger shocks in its history. The 2010 earthquake, with a magnitude of 8.8, and the subsequent tsunami resulted in 525 fatalities.
On 21 August 2025, an earthquake of magnitude 7.5 occurred off the Drake Passage south of Chile. The earthquake was felt in many cities in Argentina and Chile, but no casualties or significant damage were reported. Following the earthquake, a tsunami warning was issued for Chile’s Antarctic coast and coastal areas were evacuated. The Pacific Tsunami Warning Center soon announced that the threat had passed.
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