Moderate magnitude 4.0 earthquake at unknown depth18 Oct 17:37 UTC: First to report: RaspberryShake after 15 minutes.18 Oct 17:37: Now using data updates from BMKGI didn't feel itI felt this quakeEarthquake detailsDate & timeOct 18, 2026 17:21:48 UTC - Local time at epicenterSunday, Oct 18, 2026, at 05:21 pm (Universal Time GMT +0)Statusconfirmed (manually revised)Magnitude4.0Depth10 kmEpicenter latitude / longitude11.95°S / 117.94°EIndonesiaSeismic antipode11.95°N / 62.06°W GrenadaShaking intensityIV Light shaking near epicenterFelt0 reportsPrimary data sourceBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)Estimated 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 energy16 minutes agoOct 18, 2026 17:21 GMT / Oct 18, 2026 05:21 pm (Universal Time)Lat / Lng: -11.95 / 117.94: South of Sumbawa, IndonesiaSource: BMKGOther sources: RaspberryShake: 4.0 / 10 kmDetail info | You felt it? - Report it!';storedMarkers.push(['quake-23446808',-11.95000,117.94000,'16 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 314 km (195 mi) distance to the northeast, but it is unlikely that the quake was felt there. DistancePlaceMax. shaking intensity(*)RegionCountry314 km (195 mi)NE of epicenterTambolaka(pop: 35,800)I: Not feltKabupaten Sumba Barat Daya, East Nusa TenggaraIndonesia360 km (224 mi)NE of epicenterWaingapu(pop: 35,900)I: Not feltKabupaten Sumba Timur, East 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 GMT2026-10-18EpicenterAgency4.010 km6.2 mi(*)17:21:48South of Sumbawa, IndonesiaBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)4.010 km6.2 mi(*)17:21:48South 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 18, 2026 05:21 pm (Universal Time)16 minutes ago4.010 km0 km - This quakeSouth of Sumbawa, 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 24.5 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 5 or higher: 0.88 quakes per year (or 1 quake every 1.1 years)Mag. 4 or higher: 12 quakes per yearMag. 3 or higher: 23.8 quakes per yearMag. 2 or higher: 24.8 quakes per yearThe area where this quake occurred has a high level of seismic activity. It has had at least 50 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