Strong mag. 5.6 earthquake - South Sandwich Islands Region on Wednesday, Oct 8, 2025, at 03:50 am (Universal Time)

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The depth of the quake could not be determined, but is assumed to be shallow.The quake was not felt (or at least not reported so).Quake Data | Interactive map | User reports | Aftershocks | Earlier quakes hereHint: Click on the image to see different maps of this quake!Strong magnitude 5.6 earthquake at unknown depth8 Oct 03:59 UTC: First to report: GFZ after 9 minutes.8 Oct 04:00: Magnitude recalculated from 5.5 to 5.6.I didn't feel itI felt this quakeEarthquake detailsDate & timeOct 8, 2025 03:50:47 UTC - Local time at epicenterWednesday, Oct 8, 2025, at 03:50 am (Universal Time GMT +0)Statusunconfirmed (uncertain whether an earthquake with these data happened)Magnitude5.6Depth10 kmEpicenter latitude / longitude57.9°S / 24.31°WSouth Georgia & South Sandwich IslandsSeismic antipode57.9°N / 155.69°EShaking intensityVI Strong shaking near epicenterFelt0 reportsPrimary data sourceGFZ (German Research Centre for Geosciences)Nearest volcanoMichael (127 km / 79 mi)Estimated seismic energy released1.6 x 1013 joules (4.4 gigawatt hours, equivalent to 3788 tons of TNT or 0.2 atomic bombs!) | equivalent to ONE quake of magnitude 5.6 | about seismic energy9 minutes agoOct 8, 2025 03:50 GMT / Oct 8, 2025 03:50 am (Universal Time)Lat / Lng: -57.9 / -24.31: South Sandwich Islands RegionSource: GFZDetail info | You felt it? - Report it!';storedMarkers.push(['quake-22251850',-57.90000,-24.31000,'9 minutes ago: Mag. 5.6, South Sandwich Islands Region',html,'quakes-7-24.png',30,30,15,15,126]); function mkRep(id,notFelt){var nFelt=notFelt||false;var src="https://www.volcanoesandearthquakes.com/app/earthquake-report.php?quakeId="+id;if(nFelt==true){src+="&notFelt=true";}window.open(src,"","status=0,toolbar=0,location=0,directories=0,menubar=0,resizable=1,scrollbars=1,height=400,width=350");} function locationHashChanged(e){-1!=e.oldURL.indexOf("#popupMap")&&closePopup()} window.onhashchange = locationHashChanged; function comment(e){var t=e.parentNode,a=(t.dataset.id,document.getElementById("commentForm"));"none"==a.style.display?(t.appendChild(a),a.style.display="block"):a.style.display="none"}function sendComment(e){var t=e.parentNode,a=t.parentNode.dataset.id,n=document.getElementById("commentContent"),p=n.value.trim();if(p){var o="id="+a+"&quakeId="+thisQuakeId;o+="&comment="+decodeURIComponent(p),mkRequest("//reports.volcanodiscovery.com/app/eqReportComment.php","post",o,function(e){e.responseText;alert("Thank you for submitting your comment!"),t.style.display="none",n.value=""})}}function flagReport(e){var t=e.parentNode.dataset.id;if(confirm("Report this as inappropriate?")){var a="id="+t+"&quakeId="+thisQuakeId+"&flagAsInappropriate=1";mkRequest("//reports.volcanodiscovery.com/app/eqReportComment.php","post",a,function(t){var a=t.responseText;alert(a),e.style.display="none"})}}function likeReport(e){var t="id="+e.parentNode.dataset.id+"&quakeId="+thisQuakeId+"&like=1";mkRequest("//reports.volcanodiscovery.com/app/eqReportComment.php","post",t,function(t){t.responseText;e.style.opacity=.5})}]]>[smaller] [bigger]Most recent quakes Top 20 past 24 hrs Quakes in South Georgia and the South Sandwich IslandsNearby placesUser-reports for this quakeThere are no user reports for this quake yet.If you felt it, be the first to report it!Compare Quake DataData for the same earthquake as reported by different agenciesThe more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.MagDepthTime GMT2025-10-8EpicenterAgency5.610 km6.2 mi(*)03:50:47.99South Sandwich Islands RegionGFZ (German Research Centre for Geosciences)Notes:(*) A depth given as 10 km often means that the the depth of the quake could be not determined with sufficient accuracy.Aftershocks for this quakeNo aftershocks have been recorded so far. When aftershocks are detected, we will update this section.What are aftershocks?Larger earthquakes (above magnitude 5 or so) such as this one are usually followed by smaller ones known as aftershocks that occur in the same area during the days, weeks, months or even years after the main shock.[More info]What about this quake?Based on its magnitude, the fault that was active during the quake likely ruptured beneath a surface area of approximately 40 km2 (15 square miles) as a first-order estimate. The length of the rupture zone thus was probably around 11 km (7 mi).[More info]Recorded aftershocks, latest first (0 quake)Oct 8, 2025 03:50 am (Universal Time)9 minutes ago5.610 km0 km - This quakeSouth Sandwich Islands RegionMain Shock (this quake)MoreMap of aftershocksPrevious quakes in the same area of this earthquake9 minutes agoOct 8, 2025 03:50 GMT / Oct 8, 2025 03:50 am (Universal Time)Lat / Lng: -57.9 / -24.31: South Sandwich Islands RegionSource: GFZDetail info | You felt it? - Report it!',5.6,56, '#bb202a', 0.9,1.5, '#bb202a', 0.27);map2.addToMap('thisQuake',-57.9,-24.31,'9 minutes ago: Mag. 5.6, South Sandwich Islands Region','Earthquake: Mag 5.6 / 10 km (6.2 mi) depth9 minutes agoOct 8, 2025 03:50 GMT / Oct 8, 2025 03:50 am (Universal Time)Lat / Lng: -57.9 / -24.31: South Sandwich Islands RegionSource: GFZDetail info | You felt it? - Report it!','default'); // this will be local to this table obj function putQuakeOnMap(id,lat,lon,time,title,html,mag,zIndex) { qTableOlder.putQuakeOnMap(id,lat,lon,time,title,html,mag,zIndex); } map2.circleScale=0.5;qTableOlder.usePalette=1;qTableOlder.startVal=qTableOlder.referenceTime-(80*365.25*86400);qTableOlder.endVal=qTableOlder.referenceTime; qTableOlder.assignMap(map2); (async function(){await new Promise(r => setTimeout(r,4000));map2.map.setZoom(7)})(); })(); (async function(){while(typeof mkRequest=="undefined")await new Promise(r=>setTimeout(r,500));mkRequest("https://server2.allquakes.com/api/getPrevious.php?quakeId=22251850","get","",function(httpObj){let r=httpObj.responseText,d=document;if(""!=r&&200==httpObj.status){let o=JSON.parse(r);if(!o){d.getElementById("olderQuakesSection").remove();return};let table=d.getElementById("qTableOlder");table.innerHTML+=o.tableRows,qTableOlder.alternateBg(),d.getElementById("placeholder_largestQText").innerHTML=o.html,d.getElementById("sectionPreviousCWrap").style.display="",eval(o.js)}})})();]]>Support Us – Help Us Enhance Our Services!We’re passionate about delivering the latest volcano and earthquake data from around the globe — just for you. 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