Moderate magnitude 4.2 earthquake at 6 km depth17 Aug 06:35 UTC: First to report: BMKG after 3 minutes.I didn't feel itI felt this quakeEarthquake detailsDate & timeAug 17, 2026 06:31:59 UTC - Local time at epicenterMonday, Aug 17, 2026, at 06:31 am (Universal Time GMT +0)Statusconfirmed (manually revised)Magnitude4.2Depth6 kmEpicenter latitude / longitude10.42°S / 120.31°EKabupaten Sumba Timur, East Nusa Tenggara, IndonesiaSeismic antipode10.42°N / 59.69°WShaking intensityV Moderate shaking near epicenterFelt0 reportsPrimary data sourceBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)Nearest volcanoInierie (186 km / 116 mi)Estimated seismic energy released1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 tons of TNT) | equivalent to ONE quake of magnitude 4.2 | about seismic energy3 minutes agoAug 17, 2026 06:31 GMT / Aug 17, 2026 06:31 am (Universal Time)Lat / Lng: -10.42 / 120.31: Sumba Region, IndonesiaSource: BMKGDetail info | You felt it? - Report it!';storedMarkers.push(['quake-23283049',-10.42000,120.31000,'3 minutes ago: Mag. 4.2, Sumba Region, Indonesia',html,'quakes-6-24.png',25,25,12,12,125]); 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 hrs Quakes in BaliNearby placesThe closest larger town where the quake might have been felt is Waingapu, a town with 36,000 inhabitants in Indonesia, in 85 km (53 mi) distance north of the epicenter. People likely experienced very weak shaking there.The following table shows some of the places that might have been affected (or not) by the shaking.DistancePlaceMax. shaking intensity(*)RegionCountry85 km (53 mi)N of epicenterWaingapu(pop: 35,900)II: Very weakKabupaten Sumba Timur, East Nusa TenggaraIndonesia161 km (100 mi)NW of epicenterTambolaka(pop: 35,800)II: Very weakKabupaten Sumba Barat Daya, East Nusa TenggaraIndonesia202 km (125 mi)N of epicenterRuteng(pop: 41,500)II: Very weakKabupaten Manggarai, East Nusa TenggaraIndonesia207 km (129 mi)N of epicenterKondas(pop: 500)II: Very weakKabupaten Manggarai, East Nusa TenggaraIndonesia219 km (136 mi)N of epicenterLabuan Bajo(pop: 188,700)II: Very weakKabupaten Manggarai Barat, East Nusa TenggaraIndonesia222 km (138 mi)NW of epicenterKomodo(pop: 2,000)II: Very weakKabupaten Manggarai Barat, East Nusa TenggaraIndonesia230 km (143 mi)NE of epicenterEnde(pop: 87,300)II: Very weakEast Nusa TenggaraIndonesia252 km (157 mi)NW of epicenterSape(pop: 5,000)I: Not feltKabupaten Bima, West Nusa TenggaraIndonesia279 km (173 mi)NW of epicenterBima(pop: 161,400)I: Not feltWest Nusa TenggaraIndonesia289 km (180 mi)NE of epicenterMaumere(pop: 87,700)I: Not feltKabupaten Sikka, East Nusa TenggaraIndonesia291 km (181 mi)NW of epicenterDompu(pop: 55,000)I: Not feltWest Nusa TenggaraIndonesia301 km (187 mi)E of epicenterBaa(pop: 1,260)I: Not feltKabupaten Rote Ndao, East Nusa TenggaraIndonesia362 km (225 mi)E of epicenterKupang(pop: 442,800)I: Not feltEast Nusa TenggaraIndonesia382 km (238 mi)NW of epicenterPototano(pop: 5,000)I: Not feltKabupaten Sumbawa, West Nusa TenggaraIndonesia383 km (238 mi)NW of epicenterSumbawa Besar(pop: 62,800)I: Not feltKabupaten Sumbawa, West Nusa TenggaraIndonesiaNotes:(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.User-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 GMT2026-08-17EpicenterAgency4.26 km3.7 mi06:31:59Sumba Region, IndonesiaBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)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 2 km2 (1 square miles) as a first-order estimate. The length of the rupture zone thus was probably around 2 km (1 mi).[More info]Recorded aftershocks, latest first (0 quake)Aug 17, 2026 06:31 am (Universal Time)3 minutes ago4.26 km0 km - This quakeKabupaten Sumba Timur, East Nusa Tenggara, IndonesiaMain 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 103 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 6 or higher: 0.04 quakes per year (or 1 quake every 25.6 years)Mag. 5 or higher: 0.68 quakes per year (or 1 quake every 1.5 years)Mag. 4 or higher: 9.7 quakes per yearMag. 3 or higher: 38.9 quakes per year (or 3.2 quakes per month)Mag. 2 or higher: 101 quakes per year (or 8.4 quakes per month)Mag. 1 or higher: 102 quakes per year (or 8.5 quakes per month)The area where this quake occurred has a high level of seismic activity. It has had at least 5 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 25 to 30 years.Number of quakes per yearPrevious quakes in the same area of this earthquake