Moderate magnitude 4.0 earthquake at unknown depth26 Jul 18:33 UTC: First to report: BMKG after 4 minutes.I didn't feel itI felt this quakeEarthquake detailsDate & timeJul 26, 2025 18:29:12 UTC - Local time at epicenterSaturday, Jul 26, 2025, at 06:29 pm (Universal Time GMT +0)Statusconfirmed (manually revised)Magnitude4.0Depth10 kmEpicenter latitude / longitude0.8°N / 118.69°EEast Kutai Regency, Provinsi Kalimantan Timur, IndonesiaSeismic antipode0.8°S / 61.31°WShaking 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 energy4 minutes agoJul 26, 2025 18:29 GMT / Jul 26, 2025 06:29 pm (Universal Time)Lat / Lng: 0.8 / 118.69: Indonesia: BorneoSource: BMKGDetail info | You felt it? - Report it!';storedMarkers.push(['quake-21994836',0.80000,118.69000,'4 minutes ago: Mag. 4.0, Indonesia: Borneo',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 Bontang, a city with more than 190,000 inhabitants in Indonesia, in 153 km (95 mi) distance southwest 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(*)RegionCountry153 km (95 mi)SW of epicenterBontang(pop: 190,000)II: Very weakProvinsi Kalimantan TimurIndonesia222 km (138 mi)SW of epicenterMuarajawa(pop: 13,200)I: Not feltProvinsi Kalimantan TimurIndonesia224 km (139 mi)SW of epicenterSamarinda(pop: 831,500)I: Not feltProvinsi Kalimantan TimurIndonesia231 km (144 mi)SE of epicenterPalu(pop: 373,200)I: Not feltSulawesi TengahIndonesia235 km (146 mi)SW of epicenterLoa Janan(pop: 212,800)I: Not feltKabupaten Kutai Kartanegara, Provinsi Kalimantan TimurIndonesia270 km (168 mi)NW of epicenterTanjung Selor(pop: 56,600)I: Not feltKabupaten Bulungan, North KalimantanIndonesia302 km (188 mi)SW of epicenterCity of Balikpapan(pop: 700,000)I: Not feltProvinsi Kalimantan TimurIndonesia305 km (190 mi)NW of epicenterTarakan(pop: 250,000)I: Not feltNorth KalimantanIndonesia309 km (192 mi)SW of epicenterBalikpapan(pop: 695,300)I: Not feltProvinsi Kalimantan TimurIndonesia335 km (208 mi)SE of epicenterPoso(pop: 47,500)I: Not feltSulawesi TengahIndonesia386 km (240 mi)NW of epicenterMalinau(pop: 25,600)I: Not feltNorth KalimantanIndonesiaNotes:(*) 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 GMT2025-07-26EpicenterAgency4.010 km6.2 mi(*)18:29:12BorneoBMKG (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 26, 2025 06:29 pm (Universal Time)4 minutes ago4.010 km0 km - This quakeIndonesia: BorneoMain Shock (this quake)MoreMap of aftershocksEarthquake statisticsAverage number of earthquakesBased on data from the past 55 years and our earthquake archive back to 1900, there are about 13.3 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 6 or higher: 0.02 quakes per year (or 1 quake every 41.7 years)Mag. 5 or higher: 0.13 quakes per year (or 1 quake every 7.5 years)Mag. 4 or higher: 1.54 quakes per yearMag. 3 or higher: 8.8 quakes per yearMag. 2 or higher: 11.8 quakes per yearThe area where this quake occurred has a moderate level of seismic activity. However, It has had at least 3 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 40 to 45 years.Number of quakes per yearPrevious quakes in the same area of this earthquake