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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 | User reports | Aftershocks | Earlier quakes here | Quakes in Indonesia | Sulawesi Tengah | Gorontalo | Sulawesi UtaraHint: Click on the image to see different maps of this quake!Moderate magnitude 4.0 earthquake at unknown depth31 Jul 05:59 UTC: First to report: BMKG after 4 minutes.I didn't feel itI felt this quakeEarthquake detailsDate & timeJul 31, 2025 05:55:17 UTC - Local time at epicenterThursday, Jul 31, 2025, at 05:55 am (Universal Time GMT +0)Statusconfirmed (manually revised)Magnitude4.0Depth10 kmEpicenter latitude / longitude1.2°S / 123.15°EBanggai Laut Regency, Sulawesi Tengah, IndonesiaSeismic antipode1.2°N / 56.85°WShaking intensityIV Light shaking near epicenterFelt0 reportsPrimary data sourceBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)Nearest volcanoUna Una (206 km / 128 mi)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 energy4 minutes agoJul 31, 2025 05:55 GMT / Jul 31, 2025 05:55 am (Universal Time)Lat / Lng: -1.2 / 123.15: Sulawesi, IndonesiaSource: BMKGDetail info | You felt it? - Report it!';storedMarkers.push(['quake-22009237',-1.20000,123.15000,'4 minutes ago: Mag. 4.0, Sulawesi, 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 Luwuk, a town with 48,000 inhabitants in Indonesia, in 49 km (30 mi) distance northwest 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(*)RegionCountry49 km (30 mi)NW of epicenterLuwuk(pop: 47,800)III: WeakKabupaten Banggai, Sulawesi TengahIndonesia194 km (120 mi)N of epicenterGorontalo(pop: 198,500)I: Not feltGorontaloIndonesia233 km (145 mi)NE of epicenterModisi(pop: 560)I: Not feltSulawesi UtaraIndonesia268 km (166 mi)W of epicenterPoso(pop: 47,500)I: Not feltSulawesi TengahIndonesia317 km (197 mi)S of epicenterKendari(pop: 345,100)I: Not feltSoutheast SulawesiIndonesia329 km (204 mi)E of epicenterSanana(pop: 29,700)I: Not feltKabupaten Kepulauan Sula, North MalukuIndonesia335 km (208 mi)NE of epicenterTomohon(pop: 27,600)I: Not feltSulawesi UtaraIndonesia341 km (212 mi)NE of epicenterTondano(pop: 33,300)I: Not feltKabupaten Minahasa, Sulawesi UtaraIndonesia348 km (216 mi)SW of epicenterMasamba(pop: 38,000)I: Not feltKabupaten Luwu Utara, Provinsi Sulawesi SelatanIndonesia353 km (219 mi)NE of epicenterManado(pop: 451,900)I: Not feltSulawesi UtaraIndonesia361 km (225 mi)NE of epicenterLaikit, Laikit II (Dimembe)(pop: 8,000)I: Not feltKabupaten Minahasa Utara, Sulawesi UtaraIndonesia366 km (227 mi)W of epicenterPalu(pop: 373,200)I: Not feltSulawesi TengahIndonesia367 km (228 mi)NE of epicenterBitung(pop: 225,100)I: Not feltSulawesi UtaraIndonesia373 km (232 mi)NE of epicenterBitung(pop: 137,400)I: Not feltSulawesi UtaraIndonesiaNotes:(*) 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!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 GMT2025-07-31EpicenterAgency4.010 km6.2 mi(*)05:55:17Sulawesi, IndonesiaBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)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)Jul 31, 2025 05:55 am (Universal Time)4 minutes ago4.010 km0 km - This quakeSulawesi, IndonesiaMain Shock (this quake)MoreMap of aftershocksPrevious quakes in the same area of this earthquake4 minutes agoJul 31, 2025 05:55 GMT / Jul 31, 2025 05:55 am (Universal Time)Lat / Lng: -1.2 / 123.15: Sulawesi, IndonesiaSource: BMKGDetail info | You felt it? - Report it!',4.0,40, '#bb202a', 0.9,1.5, '#bb202a', 0.27);map2.addToMap('thisQuake',-1.2,123.15,'4 minutes ago: Mag. 4.0, Sulawesi, Indonesia','Earthquake: Mag 4.0 / 10 km (6.2 mi) depth4 minutes agoJul 31, 2025 05:55 GMT / Jul 31, 2025 05:55 am (Universal Time)Lat / Lng: -1.2 / 123.15: Sulawesi, IndonesiaSource: BMKGDetail info | You felt it? - Report it!','default'); // this will be local to this table obj function putQuakeOnMap(id,lat,lon,time,title,html,mag,zIndex) { qTableOlder.putQuakeOnMap(id,lat,lon,time,title,html,mag,zIndex); } map2.circleScale=0.5;qTableOlder.usePalette=1;qTableOlder.startVal=qTableOlder.referenceTime-(80*365.25*86400);qTableOlder.endVal=qTableOlder.referenceTime; qTableOlder.assignMap(map2); (async function(){await new Promise(r => setTimeout(r,4000));map2.map.setZoom(7)})(); })(); (async function(){while(typeof mkRequest=="undefined")await new Promise(r=>setTimeout(r,500));mkRequest("https://server2.allquakes.com/api/getPrevious.php?quakeId=22009237","get","",function(httpObj){let r=httpObj.responseText,d=document;if(""!=r&&200==httpObj.status){let o=JSON.parse(r);if(!o){d.getElementById("olderQuakesSection").remove();return};let table=d.getElementById("qTableOlder");table.innerHTML+=o.tableRows,qTableOlder.alternateBg(),d.getElementById("placeholder_largestQText").innerHTML=o.html,d.getElementById("sectionPreviousCWrap").style.display="",eval(o.js)}})})();]]>Sources: VolcanoDiscovery / VolcanoAdventures and other sources as noted.Use of material: Most text and images on our websites are owned by us. 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