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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 | Seismograms | User reports | Aftershocks | Earlier quakes hereHint: Click on the image to see different maps of this quake!Strong magnitude 5.1 earthquake at unknown depth29 Aug 05:53 UTC: First to report: GFZ after 13 minutes.29 Aug 05:53: Now using data updates from EMSC29 Aug 05:57: Now using data updates from USGSI didn't feel itI felt this quakeEarthquake detailsDate & timeAug 29, 2026 05:40:06 UTC - Local time at epicenterSaturday, Aug 29, 2026, at 09:40 am (GMT +4)Statusconfirmed (manually revised)Magnitude5.09Depth10 kmEpicenter latitude / longitude31.8483°S / 56.9522°EInternational Territory (not near any country)Seismic antipode31.8483°N / 123.048°WQuality68 seismic stationsShaking intensityV Moderate shaking near epicenterFelt0 reportsPrimary data sourceUSGS (United States Geological Survey)Weather at epicenter at time of quakeOvercast Clouds 14.4°C (58 F), humidity: 61%, wind: 7 m/s (13 kts) from SSEEstimated seismic energy released2.8 x 1012 joules (783 megawatt hours, equivalent to 674 tons of TNT) | equivalent to ONE quake of magnitude 5.1 | about seismic energy27 minutes agoAug 29, 2026 05:40 GMT / Aug 29, 2026 09:40 am (GMT +4)Lat / Lng: -31.8483 / 56.9522: Southwest Indian RidgeSource: USGSOther sources: GFZ: 5.1 / 10 km, RaspberryShake: 5.1 / 10 km, 1 more...Detail info | You felt it? - Report it!';storedMarkers.push(['quake-23320851',-31.84830,56.95220,'27 minutes ago: Mag. 5.1, Southwest Indian Ridge',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+="¬Felt=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 hrsUser-reports for this quakeThere are no user reports for this quake yet.If you felt it, be the first to report it!Get the Android appCompare 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 GMT2026-08-29EpicenterAgency5.0910 km6.2 mi(*)05:40:06.207Southwest Indian RidgeUSGS (United States Geological Survey)5.0910 km6.2 mi(*)05:40:07.3Southwest Indian Ridge8.2 km (5.1 mi) epicenter difference with USGSGFZ (German Research Centre for Geosciences)5.110 km6.2 mi(*)05:40:07Southwest Indian Ridge8.2 km (5.1 mi) epicenter difference with USGSRaspberryShake (RaspberryShake)5.116 km9.9 mi05:40:08.9SOUTHWEST INDIAN RIDGE13 km (7.8 mi) epicenter difference with USGSEMSC (European-Mediterranean Seismological Centre)Notes:(*) A depth given as 10 km often means that the the depth of the quake could be not determined with sufficient accuracy."; HTMLcontent += ""; mainMap.addToMap("station"+id, lat, lon, title,HTMLcontent); mainMap.map.panTo([lat,lon]); document.getElementById("map_canvas").scrollIntoView();}document.addEventListener("DOMContentLoaded", function () { var section = document.getElementById("seismogramSection"); if (!section) return; var images = section.querySelectorAll("img.waitBg"); if (!images.length) return; images.forEach(function(img, index){ img.addEventListener("error", function(){ // If the first image fails, hide the whole section. if (index === 0) { // Remove TOC entry var tocLink = document.querySelector('#toc .tocLink[data-href="seismogramSection"]'); if (tocLink) {tocLink.remove()} // Remove whole section section.remove(); } // Otherwise remove only this station. var plot = img.closest(".plotContainer"); if (!plot) return; var station = plot.previousElementSibling; var caption = plot.nextElementSibling; if (station) station.remove(); plot.remove(); if (caption) caption.remove(); // Remove empty "Show more" var more = document.getElementById("moreSeismograms"); if (more && !more.querySelector(".plotContainer")) { more.remove(); var btn = document.getElementById("moreSeismograms_1"); if (btn) btn.remove(); } // Hide section if nothing remains. if (!section.querySelector(".plotContainer")) { section.style.display = "none"; } }, { once: true }); });});]]>SeismogramsSeismic station: Ambohimpanompo, Madagascar (ABPO/II network) | Distance from quake: 1727 km / 1073 mi | Show on map | Station InfoSeismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.02-2.0 Hz. Source: NSF SAGE Facility IRISWS timeseriesplot Web ServiceAftershocks 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 13 km2 (5 square miles) as a first-order estimate. The length of the rupture zone thus was probably around 6 km (4 mi).[More info]Recorded aftershocks, latest first (0 quake)Aug 29, 2026 09:40 am (GMT +4)27 minutes ago5.110 km0 km - This quakeSouthwest Indian RidgeMain Shock (this quake)MoreMap of aftershocksEarthquake statisticsAverage number of earthquakesBased on data from the past 56 years and our earthquake archive back to 1900, there are about 4.6 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 5 or higher: 0.47 quakes per year (or 1 quake every 2.1 years)Mag. 4 or higher: 4.2 quakes per yearMag. 3 or higher: 4.7 quakes per yearMag. 2 or higher: 4.7 quakes per yearThe area where this quake occurred has a high level of seismic activity. It has had at least 27 quakes above magnitude 5 since 1970, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 1 to 5 years.Number of quakes per yearPrevious quakes in the same area of this earthquake