Moderate magnitude 4.0 earthquake at 13 km depth1 Sep 18:00 UTC: First to report: EMSC after 3 minutes.1 Sep 18:01: Now using data updates from BMKG1 Sep 18:03: Magnitude recalculated from 3.9 to 4.0. Hypocenter depth recalculated from 10.00 to 13.00 km (from 6.2 to 8.1 mi). Epicenter location corrected by 11 km (7 mi) towards S.I didn't feel itI felt this quakeEarthquake detailsDate & timeSep 1, 2026 17:58:11 UTC - Local time at epicenterWednesday, Sep 2, 2026, at 01:58 am (Asia/Makassar GMT +8)Statusconfirmed (manually revised)Magnitude4.0Depth13 kmEpicenter latitude / longitude9.65°S / 119.28°EKabupaten Sumba Barat Daya, East Nusa Tenggara, IndonesiaSeismic antipode9.65°N / 60.72°WVenezuelaShaking intensityIV Light shaking near epicenterFelt1 reportPrimary data sourceBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)Nearest volcanoDoro Otota (105 km / 65 mi)Weather at epicenter at time of quakeBroken Clouds 17.7°C (64 F), humidity: 87%, wind: 1 m/s (3 kts) from ESEEstimated 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 energy14 minutes ago reported feltSep 1, 2026 17:58 GMT / Sep 2, 2026 01:58 am (Makassar time)Lat / Lng: -9.65 / 119.28: Sumba Region, IndonesiaSource: BMKGOther sources: EMSC: 3.9 / 10 km, RaspberryShake: 4.0 / 13 kmDetail info | Read user reports | You felt it? - Report it!';storedMarkers.push(['quake-23328971',-9.65000,119.28000,'14 minutes ago: Mag. 4.0, 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 Tambolaka, a town with 36,000 inhabitants in Indonesia, in 25 km (16 mi) distance north of the epicenter. People likely experienced weak shaking there.The following table shows some of the places that might have been affected (or not) by the shaking.DistancePlaceMax. shaking intensity(*)RegionCountry25 km (16 mi)N of epicenterTambolaka(pop: 35,800)III: WeakKabupaten Sumba Barat Daya, East Nusa TenggaraIndonesia108 km (67 mi)E of epicenterWaingapu(pop: 35,900)II: Very weakKabupaten Sumba Timur, East Nusa TenggaraIndonesia120 km (75 mi)N of epicenterKomodo(pop: 2,000)II: Very weakKabupaten Manggarai Barat, East Nusa TenggaraIndonesia125 km (78 mi)N of epicenterSape(pop: 5,000)II: Very weakKabupaten Bima, West Nusa TenggaraIndonesia145 km (90 mi)NE of epicenterLabuan Bajo(pop: 188,700)II: Very weakKabupaten Manggarai Barat, East Nusa TenggaraIndonesia146 km (90 mi)NW of epicenterBima(pop: 161,400)II: Very weakWest Nusa TenggaraIndonesia146 km (91 mi)NE of epicenterKondas(pop: 500)II: Very weakKabupaten Manggarai, East Nusa TenggaraIndonesia153 km (95 mi)NW of epicenterDompu(pop: 55,000)II: Very weakWest Nusa TenggaraIndonesia174 km (108 mi)NE of epicenterRuteng(pop: 41,500)II: Very weakKabupaten Manggarai, East Nusa TenggaraIndonesia241 km (150 mi)NW of epicenterPototano(pop: 5,000)I: Not feltKabupaten Sumbawa, West Nusa TenggaraIndonesia241 km (150 mi)NW of epicenterSumbawa Besar(pop: 62,800)I: Not feltKabupaten Sumbawa, West Nusa TenggaraIndonesia276 km (172 mi)E of epicenterEnde(pop: 87,300)I: Not feltEast Nusa TenggaraIndonesia285 km (177 mi)W of epicenterTaliwang(pop: 55,300)I: Not feltKabupaten Sumbawa Barat, West Nusa TenggaraIndonesia314 km (195 mi)NW of epicenterLabuan Lombok(pop: 10,000)I: Not felt314 km (195 mi)NW of epicenterLabuan Lombok(pop: 10,000)I: Not feltIndonesia314 km (195 mi)NW of epicenterLabuan Lombok(pop: 10,000)I: Not feltWest Nusa TenggaraIndonesia322 km (200 mi)W of epicenterSelong(pop: 92,500)I: Not feltKabupaten Lombok Timur, West Nusa TenggaraIndonesia341 km (212 mi)NW of epicenterBangsal(pop: 100)I: Not feltWest Nusa TenggaraIndonesia478 km (297 mi)E of epicenterKupang(pop: 442,800)I: Not feltEast Nusa TenggaraIndonesiaNotes:(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.User-reports for this quake (1)So far, we have received 1 report for this quake from Indonesia.It came from near Tambolaka, a town with 36,000 inhabitants in East Nusa Tenggara in 25 km (16 mi) distance north of the epicenter, Indonesia.This section is being updated as new data comes in.User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.Translate36 km of Tambolaka, Southwest Sumba Regency, East Nusa Tenggara (11.5 km SSE of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)List of cities/places with most reportsPlaceDistance from epicenterAverage reported Shaking IntensityNr. of reportsTambolaka, East Nusa Tenggara, Indonesia(Pop.: 35,790)25 km (16 mi)N of epicenterIII: Weak shaking1Note: Only reports with latitude/longitude coordinate positions given (1 in total) could be used for statistics.What is Intensity and the Mercalli Intensity Scale?The amount of shaking that occurs on the surface due to an earthquake is called the intensity. It is commonly measured on the so-called Modified Mercalli Intensity Scale (MMI) ranging from 1 (not felt) to 10 (extreme shaking), and given in Roman numerals as I,II,...IX, X, and often displayed with color codes ranging from light blue to dark red.Earthquake intensity depends mainly on the magnitude and depth of the quake as well as the distance from the epicenter: The further away, the less shaking intensity occurs.Read more about the MMI scale!Number of reports by intensityShaking intensityNumber of reportsMin-Max distance from epicenter (*)Average distance (*)III: Weak shaking111.4–11.4 km (7.1–7.1 mi)11.4 km (7 mi)Notes(*) Reports are filtered to exclude those that are likely highly inaccurate or esaggerated.Only reports with latitude/longitude coordinate positions given (1 in total) could be used for geographic statistics.Get the Android appI didn't feel itI felt this quakeIf you were near the epicenter and felt it, please share your experience and submit a short "I felt it" report! Other users would love to hear about it!If you did NOT feel the quake although you were in the area, please report it as well! Your contribution is valuable to earthquake science and seismic hazard analysis.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 GMT2026-09-1EpicenterAgency4.013 km8.1 mi17:58:11Sumba Region, IndonesiaBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)3.910 km6.2 mi(*)17:58:11SUMBA REGION, INDONESIA11 km (7 mi) epicenter difference with BMKGEMSC (European-Mediterranean Seismological Centre)4.013 km8.1 mi17:58:11Sumba Region, 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)Sep 2, 2026 01:58 am (Makassar)14 minutes ago4.013 km0 km - This quake25 km S of Tambolaka, Kabupaten Sumba Barat Daya, East Nusa Tenggara, IndonesiaMain Shock (this quake)MoreMap of aftershocksEarthquake statisticsAverage number of earthquakesBased on data from the past 26 years and our earthquake archive back to 1900, there are about 455 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 6 or higher: 0.15 quakes per year (or 1 quake every 6.7 years)Mag. 5 or higher: 2.6 quakes per yearMag. 4 or higher: 36.2 quakes per year (or 3 quakes per month)Mag. 3 or higher: 166 quakes per year (or 13.8 quakes per month)Mag. 2 or higher: 450 quakes per year (or 37.5 quakes per month)Mag. 1 or higher: 454 quakes per year (or 37.8 quakes per month)The area where this quake occurred has a very high level of seismic activity. It has had at least 19 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 5 to 10 years.Number of quakes per yearPrevious quakes in the same area of this earthquake