Real-time coverage of earthquake event — 296 km SSE of Ushuaia, Argentina — Pandita Data.
🌍 OPEN LIVE 3D EARTHQUAKE MAPA magnitude 5.8 earthquake struck 296 km south-southeast of Ushuaia, Argentina at 01:26 UTC on July 7, 2026, at a shallow depth of 10 km.
The earthquake occurred in one of Earth's most remote and sparsely populated regions—the Drake Passage approach south of Tierra del Fuego. No tsunami warning was issued by the Pacific Tsunami Warning Center, and the USGS PAGER alert system assigned a GREEN designation, indicating minimal expected impact. Zero felt reports were recorded, consistent with the event's location far from populated areas. Despite the moderate magnitude, this event underscores the intense tectonic activity along the southern boundary of the South American Plate, where some of Earth's most active fault systems continue to reshape the landscape.
The region south of Ushuaia lies at the triple junction where the South American, Antarctic, and Scotia Plates meet—a geometrically complex zone producing frequent seismic activity. The primary structure driving seismicity here is the Scotia Arc, a curved subduction zone where the South American Plate is driven beneath the Scotia Plate at a convergence rate of approximately 9 cm per year. This region also experiences transform motion along the Shackleton Fracture Zone and other ridge-transform intersections. The shallow depth of 10 km places this rupture within the brittle oceanic crust, typical of strike-slip or oblique-slip mechanisms common in this triple junction environment. Historical earthquakes in this region regularly exceed magnitude 6.0, making it one of the most seismically active ocean basins on Earth.
Magnitude 5.8 earthquakes release approximately 1.4 × 1015 joules of energy—equivalent to roughly 335 tons of TNT. The shallow 10 km focal depth indicates the rupture initiated and propagated through the upper oceanic lithosphere, where temperatures are cool enough to support brittle fracture. At this depth and magnitude, rupture dimensions are estimated between 15–20 km in length and 8–12 km in width, typical of moderate strike-slip events. The seismic moment released was Mw 5.8, indicating efficient energy transfer through the Scotia Arc's transform-dominated structure.
At 10 km depth, this earthquake is classified as shallow—the zone where rupture velocity can reach 80–90% of S-wave speed, generating strong ground acceleration. However, the extreme remoteness (296 km from Ushuaia, over open ocean) ensures no coastal amplification or landslide triggering occurs. Shallow oceanic earthquakes in subduction and transform zones do not typically generate large tsunamis unless they involve vertical seafloor displacement. This event's strike-slip or oblique mechanism produced minimal vertical offset, explaining the GREEN PAGER alert and no tsunami warning.
Ushuaia, population ~60,000, is the southernmost city in Argentina and the nearest major settlement to the epicenter. The 296 km distance—greater than the typical felt radius for M5.8 events—meant no shaking was reported in the city. The broader region experiences frequent seismic activity; a magnitude 6.2 earthquake struck 197 km south of Ushuaia in 2016. Research stations and fishing vessels operating in the Drake Passage and Scotia Sea region would have been the only human observers, though at distances where shaking would be unnoticeable aboard ships. No infrastructure damage, casualties, or disruption to shipping lanes occurred.
Use Pandita Data's real-time earthquake 3D simulation to visualize plate boundary mechanics in this region and understand how shallow ruptures propagate through oceanic lithosphere. Explore historical seismicity along the Scotia Arc and triple junction to build context for future events.
FAQ::[{"q":"What caused this earthquake?","a":"Strike-slip or oblique motion along the Scotia Arc at the South American-Antarctic-Scotia Plate triple junction, driven by ~9 cm/year convergence and transform shear."},{"q":"Is a tsunami risk associated with this event?","a":"No. The USGS issued no tsunami warning. Strike-slip focal mechanisms produce minimal vertical seafloor displacement, and no PAGER alert exceeds GREEN."},{"q":"What should people near Ushuaia do right now?","a":"No action required. The epicenter is 296 km away over open ocean.