Moderate magnitude 4.0 earthquake at unknown depth20 Oct 14:14 UTC: First to report: EMSC after 8 minutes.20 Oct 14:15: Now using data updates from BMKGI didn't feel itI felt this quakeEarthquake detailsDate & timeOct 20, 2026 14:06:27 UTC - Local time at epicenterTuesday, Oct 20, 2026, at 10:06 pm (GMT +8)Statusconfirmed (manually revised)Magnitude4.0Depth10 kmEpicenter latitude / longitude11.57°S / 118.94°EIndonesiaSeismic antipode11.57°N / 61.06°W Trinidad and TobagoShaking intensityIV Light shaking near epicenterFelt0 reportsPrimary data sourceBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)Weather at epicenter at time of quakeBroken Clouds 27.5°C (82 F), humidity: 76%, wind: 3 m/s (6 kts) from SEstimated seismic energy released6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 tons of TNT) | equivalent to ONE quake of magnitude 4.0 | about seismic energy34 minutes agoOct 20, 2026 14:06 GMT / Oct 20, 2026 10:06 pm (GMT +8)Lat / Lng: -11.57 / 118.94: South of Sumbawa, IndonesiaSource: BMKGOther sources: EMSC: 4.0 / 10 km, RaspberryShake: 4.0 / 10 kmDetail info | You felt it? - Report it!';storedMarkers.push(['quake-23451701',-11.57000,118.94000,'34 minutes ago: Mag. 4.0, South of Sumbawa, 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 near the epicenter is Tambolaka, a town with 36,000 inhabitants in Indonesia, in 240 km (149 mi) distance to the north, but it is unlikely that the quake was felt there. DistancePlaceMax. shaking intensity(*)RegionCountry240 km (149 mi)N of epicenterTambolaka(pop: 35,800)I: Not feltKabupaten Sumba Barat Daya, East Nusa TenggaraIndonesia257 km (160 mi)NE of epicenterWaingapu(pop: 35,900)I: Not feltKabupaten Sumba Timur, East Nusa TenggaraIndonesia388 km (241 mi)NW of epicenterTaliwang(pop: 55,300)I: Not feltKabupaten Sumbawa Barat, West Nusa TenggaraIndonesia425 km (264 mi)NE of epicenterEnde(pop: 87,300)I: Not feltEast Nusa TenggaraIndonesia432 km (269 mi)NW of epicenterPraya(pop: 35,200)I: Not feltKabupaten Lombok Tengah, West Nusa TenggaraIndonesia446 km (277 mi)NW of epicenterLembar(pop: 10,000)I: Not feltKabupaten Lombok Barat, 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 GMT2026-10-20EpicenterAgency4.010 km6.2 mi(*)14:06:27South of Sumbawa, IndonesiaBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)4.010 km6.2 mi(*)14:06:27SOUTH OF SUMBAWA, INDONESIA0 km (0 mi) epicenter difference with BMKGEMSC (European-Mediterranean Seismological Centre)4.010 km6.2 mi(*)14:06:27South of Sumbawa, Indonesia0 km (0 mi) epicenter difference with BMKGRaspberryShake (RaspberryShake)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 1 km2 (0 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)Oct 20, 2026 10:06 pm (GMT +8)34 minutes ago4.010 km0 km - This quakeIndian Ocean, 240 km S of Tambolaka, 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 27 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 6 or higher: 0.03 quakes per year (or 1 quake every 31.3 years)Mag. 5 or higher: 0.88 quakes per year (or 1 quake every 1.1 years)Mag. 4 or higher: 8.6 quakes per yearMag. 3 or higher: 22.4 quakes per yearMag. 2 or higher: 27.1 quakes per yearThe area where this quake occurred has a high level of seismic activity. It has had at least 4 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 30 to 35 years.Number of quakes per yearPrevious quakes in the same area of this earthquake