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The quake had a moderate depth of 173 km (107 mi) and was felt widely in the area.Quake Data | Interactive map | Seismograms | User reports | Aftershocks | Earlier quakes here | Quakes in Indonesia | Quakes in Malaysia | North Sumatra | Nanggroe Aceh Darussalam Province | PerakHint: Click on the image to see different maps of this quake!Very strong magnitude 6.3 earthquake at 173 km depth15 Aug 10:57 UTC: First to report: VolcanoDiscovery after 3 minutes.15 Aug 10:59: Now using data updates from BMKG... [show all] ...15 Aug 11:01: Now using data updates from EMSC15 Aug 11:02: Magnitude recalculated from 6.4 to 6.3.15 Aug 11:04: Epicenter location corrected by 3 km (1.9 mi) towards NE.15 Aug 11:05: Epicenter location corrected by 4 km (2.5 mi) towards ENE.Update Sat, 15 Aug 2026, 11:00Significant earthquake of magnitude 6.4 just reported 13 km west of Pematangsiantar, IndonesiaAn earthquake of magnitude 6.4 occurred only 5 minutes ago 13 km west of Pematangsiantar, Indonesia, Indonesia's Meteorology, Climatology, and Geophysical Agency reported.The quake hit at an intermediate to considerable depth of 163. km beneath the epicenter near Pematangsiantar, Kota Pematang Siantar, North Sumatra, Indonesia, in the afternoon on Saturday, August 15th, 2026, at 5:54 pm local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.Weak shaking might have been felt in Pematangsiantar (pop. 274,800) located 13 km from the epicenter, Pekan Bahapal (pop. 40,000) 30 km away, Tebingtinggi (pop. 117,500) 46 km away, Kabanjahe (pop. 73,600) 53 km away, Perbaungan (pop. 157,200) 67 km away, Percut (pop. 311,100) 73 km away, Kisaran (pop. 141,900) 74 km away, and Medan (pop. 2,435,300) 75 km away.VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.If you were or still are in this area during the quake help others with your feedback and report it here.Download the Volcanoes & Earthquakes app and get one of the fastest seismic alerts online: Android | iOSI didn't feel itI felt this quakeEarthquake detailsDate & timeAug 15, 2026 10:54:52 UTC - Local time at epicenterSaturday, Aug 15, 2026, at 10:54 am (Universal Time GMT +0)StatusconfirmedMagnitude6.30Depth173 kmEpicenter latitude / longitude2.9837°N / 99.0339°EKota Pematang Siantar, North Sumatra, IndonesiaSeismic antipode2.9837°S / 80.966°WEcuadorShaking intensityIV Light shaking near epicenterFelt20 reportsPrimary data sourceEMSC (European-Mediterranean Seismological Centre)Nearest volcanoSimbolon (15 km / 9 mi)Weather at epicenter at time of quakeClear Sky 27.1°C (81 F), humidity: 83%, wind: 1 m/s (3 kts) from WEstimated seismic energy released1.8 x 1014 joules (49.4 gigawatt hours, equivalent to 42502 tons of TNT or 2.7 atomic bombs!) | equivalent to ONE quake of magnitude 6.3 | about seismic energy10 minutes ago reported feltAug 15, 2026 10:54 GMT / Aug 15, 2026 10:54 am (Universal Time)Lat / Lng: 2.9837 / 99.0339: Northern Sumatra, IndonesiaSource: EMSCOther sources: GFZ: 6.4 / 169 km, BMKG: 6.4 / 163 kmDetail info | Read user reports | You felt it? - Report it!';storedMarkers.push(['quake-23274637',2.98370,99.03390,'10 minutes ago: Mag. 6.3, Northern Sumatra, Indonesia',html,'quakes-8-24.png',35,35,17,17,127]); 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 Medan, a city of 2.4 million people in Indonesia, in 78 km (49 mi) distance northwest of the epicenter. People likely experienced light shaking there. Many smaller towns and villages are located closer to the epicenter and might have experienced stronger shaking. In the capital of Malaysia, Kuala Lumpur, 295 km (183 mi) away from the epicenter, the earthquake was probably felt as light shaking.The following table shows some of the places that might have been affected (or not) by the shaking.DistancePlaceMax. shaking intensity(*)RegionCountry5 km (3 mi)SE of epicenterPematangsiantar(pop: 274,800)IV: LightKota Pematang Siantar, North SumatraIndonesia21 km (13 mi)NE of epicenterPekan Bahapal(pop: 40,000)IV: LightKabupaten Simalungun, North SumatraIndonesia41 km (25 mi)N of epicenterTebingtinggi(pop: 117,500)IV: LightKota Tebing Tinggi, North SumatraIndonesia62 km (38 mi)W of epicenterKabanjahe(pop: 73,600)IV: LightKabupaten Karo, North SumatraIndonesia63 km (39 mi)W of epicenterBerastagi(pop: 48,200)IV: LightKabupaten Karo, North SumatraIndonesia65 km (40 mi)E of epicenterKisaran(pop: 141,900)IV: LightKabupaten Asahan, North SumatraIndonesia66 km (41 mi)N of epicenterPerbaungan(pop: 157,200)IV: LightKabupaten Serdang Bedagai, North SumatraIndonesia70 km (44 mi)NW of epicenterDeli Tua(pop: 27,900)IV: LightKabupaten Deli Serdang, North SumatraIndonesia74 km (46 mi)N of epicenterPercut(pop: 311,100)IV: LightKabupaten Deli Serdang, North SumatraIndonesia78 km (49 mi)NW of epicenterMedan(pop: 2,435,300)IV: LightNorth SumatraIndonesia81 km (50 mi)NW of epicenterSunggal(pop: 157,900)IV: LightKota Medan, North SumatraIndonesia84 km (52 mi)W of epicenterSidikalang(pop: 50,700)IV: LightKabupaten Dairi, North SumatraIndonesia85 km (53 mi)E of epicenterTanjungbalai(pop: 183,200)IV: LightKota Tanjung Balai, North SumatraIndonesia87 km (54 mi)E of epicenterTeluk Nibung(pop: 25,100)IV: LightKota Tanjung Balai, North SumatraIndonesia92 km (57 mi)NW of epicenterBinjai(pop: 279,300)IV: LightNorth SumatraIndonesia96 km (60 mi)NW of epicenterBelawan(pop: 102,700)IV: LightKota Medan, North SumatraIndonesia106 km (66 mi)NW of epicenterStabat(pop: 26,900)IV: LightKabupaten Langkat, North SumatraIndonesia108 km (67 mi)S of epicenterTarutung(pop: 39,500)IV: LightKabupaten Tapanuli Utara, North SumatraIndonesia109 km (68 mi)NW of epicenterLabuhan Deli(pop: 49,700)IV: LightKota Medan, North SumatraIndonesia131 km (81 mi)SE of epicenterBandar(pop: 31,400)IV: LightKabupaten Labuhan Batu, North SumatraIndonesia132 km (82 mi)SE of epicenterRantauprapat(pop: 103,000)IV: LightKabupaten Labuhan Batu, North SumatraIndonesia133 km (82 mi)W of epicenterSubulussalam(pop: 90,800)IV: LightNanggroe Aceh Darussalam ProvinceIndonesia141 km (87 mi)NW of epicenterTanjungtiram(pop: 25,100)IV: LightKabupaten Langkat, North SumatraIndonesia141 km (88 mi)S of epicenterSibolga(pop: 91,300)IV: LightNorth SumatraIndonesia143 km (89 mi)NW of epicenterPangkalan Brandan(pop: 25,500)IV: LightKabupaten Langkat, North SumatraIndonesia159 km (99 mi)SW of epicenterSingkil(pop: 46,800)IV: LightNanggroe Aceh Darussalam ProvinceIndonesia180 km (112 mi)S of epicenterPadangsidempuan(pop: 236,200)IV: LightKota Padangsidimpuan, North SumatraIndonesia203 km (126 mi)NW of epicenterLangsa(pop: 194,700)IV: LightNanggroe Aceh Darussalam ProvinceIndonesia226 km (141 mi)NE of epicenterSeri Manjung(pop: 100,000)IV: LightManjung (Dinding), PerakMalaysia230 km (143 mi)NE of epicenterSitiawan(pop: 156,200)IV: LightManjung (Dinding), PerakMalaysia246 km (153 mi)SW of epicenterGunungsitoli(pop: 136,700)IV: LightNorth SumatraIndonesia249 km (155 mi)NE of epicenterTeluk Intan(pop: 232,800)IV: LightHilir Perak, PerakMalaysia258 km (160 mi)W of epicenterBlangpidie(pop: 24,100)IV: LightKabupaten Aceh Barat Daya, Nanggroe Aceh Darussalam ProvinceIndonesia273 km (169 mi)SW of epicenterLahewa(pop: 24,500)IV: LightKabupaten Nias Utara, North SumatraIndonesia295 km (183 mi)E of epicenterKuala Lumpur(pop: 1,454,000)IV: LightKuala LumpurMalaysia301 km (187 mi)SW of epicenterTeluk Dalam(pop: 25,800)IV: LightKabupaten Nias Selatan, North SumatraIndonesia305 km (190 mi)SE of epicenterDumai(pop: 331,800)III: WeakRiauIndonesia321 km (200 mi)NW of epicenterLhokseumawe(pop: 196,100)III: WeakNanggroe Aceh Darussalam ProvinceIndonesia383 km (238 mi)SE of epicenterPekanbaru(pop: 1,085,000)III: WeakRiauIndonesia395 km (246 mi)S of epicenterBukittinggi(pop: 121,000)III: WeakProvinsi Sumatera BaratIndonesiaNotes:(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.User-reports for this quake (25)The first report about ground shaking reached us after only 3 minutes, before other agencies reported it. So far, we have received 25 reports for this quake from Indonesia and Malaysia. Out of these, 20 people indicated they felt it. The quake was reported to have been felt in up to approx. 400–700 km (249–435 mi) distance.The majority of reports came from Padang (1 report), a city of 0.9 million people in Provinsi Sumatera Barat in 461 km (287 mi) distance south of the epicenter, Indonesia, Medan (1 report), a city of 2.4 million people in North Sumatra in 78 km (49 mi) distance northwest of the epicenter, and Manado (1 report) (2,874 km or 1,786 mi to the east) in Sulawesi Utara. See the list of places where most people reported this quake further below.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.Contribute:Leave a comment if you find a particular report interesting or want to add to it.Flag as inappropriate.Mark as helpful or interesting.Send your own user report!Translate312.4 km NW of epicenter [Map] / Very weak shaking (MMI II) (reported through our app)306.5 km E of epicenter [Map] / Weak shaking (MMI III) (reported through our iOS app)317.5 km NNE of epicenter [Map] / Weak shaking (MMI III) (reported through our app)356.9 km NNE of epicenter [Map] / Weak shaking (MMI III) (reported through our iOS app)Lawangirung, Manado, North Sulawesi / Very weak shaking (MMI II) / single lateral shake / 1-2 s78.3 km NW of epicenter [Map] / Light shaking (MMI IV) (reported through our app)Langkawi (374.6 km NNE of epicenter) [Map] / Weak shaking (MMI III) : In bed 461.2 km SSE of epicenter [Map] / Weak shaking (MMI III) (reported through our app)320.8 km SSE of epicenter [Map] / Light shaking (MMI IV) (reported through our app)796.4 km N of epicenter [Map] / not felt (reported through our iOS app)1348.1 km SE of epicenter [Map] / not felt (reported through our app)245.5 km SW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)bayan lepas (230.9 km NE of epicenter) [Map] / Very weak shaking (MMI II) : Sitting on chair, notice the water and chair shaking 203.5 km NW of epicenter [Map] / Light shaking (MMI IV) (reported through our app)309 km NNE of epicenter [Map] / Weak shaking (MMI III) (reported through our app)/ not felt (reported through our app)722.2 km NW of epicenter [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s : Shaking of bed 302.2 km E of epicenter [Map] / Weak shaking (MMI III) / 2-5 s (reported through our iOS app)461.6 km SSE of epicenter [Map] / Light shaking (MMI IV) (reported through our app)61.9 km WNW of epicenter [Map] / Weak shaking (MMI III) (reported through our app)555.1 km ESE of epicenter [Map] / Weak shaking (MMI III) (reported through our app)Georgetown (307 km NNE of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 20-30 s : Building moved side to side 206.2 km W of epicenter [Map] / Light shaking (MMI IV) (reported through our app)1212.9 km N of epicenter [Map] / not felt (reported through our app)1220.5 km N of epicenter [Map] / not felt (reported through our app)Show moreList of cities/places with most reportsPlaceDistance from epicenterAverage reported Shaking IntensityNr. of reportsPadang, Provinsi Sumatera Barat, Indonesia(Pop.: 909,040)461 km (287 mi)S of epicenterIII: Weak shaking1Medan, North Sumatra, Indonesia(Pop.: 2,435,252)78 km (49 mi)NW of epicenterIV: Light shaking1Manado, Sulawesi Utara, Indonesia(Pop.: 451,916)2,874 km (1,786 mi)E of epicenterII: Very weak shaking1Paya Terubong, Pulau Pinang, Malaysia(Pop.: 226,712)300 km (186 mi)NE of epicenterIII: Weak shaking1Note: Only reports with latitude/longitude coordinate positions given (25 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 (*)I: Not felt4795–1,347 km (494–837 mi)1,143 km (710 mi)II: Very weak shaking3231–722 km (143–448 mi)421 km (262 mi)III: Weak shaking962–554 km (38–344 mi)338 km (210 mi)IV: Light shaking578–461 km (49–287 mi)254 km (158 mi)V: Moderate shaking1245–245 km (152–152 mi)245 km (152 mi)Notes(*) Reports are filtered to exclude those that are likely highly inaccurate or esaggerated.Only reports with latitude/longitude coordinate positions given (25 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 GMT2026-08-15EpicenterAgency6.3173 km107 mi10:54:52.44NORTHERN SUMATRA, INDONESIAEMSC (European-Mediterranean Seismological Centre)6.37169 km105 mi10:54:52.45Northern Sumatra, Indonesia3.5 km (2.1 mi) epicenter difference with EMSCGFZ (German Research Centre for Geosciences)6.4163 km101 mi10:54:52Northern Sumatra, Indonesia9.4 km (5.9 mi) epicenter difference with EMSCBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)"; HTMLcontent += ""; mainMap.addToMap("station"+id, lat, lon, title,HTMLcontent); mainMap.map.panTo([lat,lon]); document.getElementById("map_canvas").scrollIntoView();}document.addEventListener("DOMContentLoaded", function () { var section = document.getElementById("seismogramSection"); if (!section) return; var images = section.querySelectorAll("img.waitBg"); if (!images.length) return; images.forEach(function(img, index){ img.addEventListener("error", function(){ // If the first image fails, hide the whole section. if (index === 0) { // Remove TOC entry var tocLink = document.querySelector('#toc .tocLink[data-href="seismogramSection"]'); if (tocLink) {tocLink.remove()} // Remove whole section section.remove(); } // Otherwise remove only this station. var plot = img.closest(".plotContainer"); if (!plot) return; var station = plot.previousElementSibling; var caption = plot.nextElementSibling; if (station) station.remove(); plot.remove(); if (caption) caption.remove(); // Remove empty "Show more" var more = document.getElementById("moreSeismograms"); if (more && !more.querySelector(".plotContainer")) { more.remove(); var btn = document.getElementById("moreSeismograms_1"); if (btn) btn.remove(); } // Hide section if nothing remains. if (!section.querySelector(".plotContainer")) { section.style.display = "none"; } }, { once: true }); });});]]>SeismogramsSeismic station: West Island, Cocos (Keeling) Islands (COCO/II network) | Distance from quake: 1705 km / 1059 mi | Show on map | Station InfoSeismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.02-2.0 Hz. Source: NSF SAGE Facility IRISWS timeseriesplot Web ServiceSeismic station: Chiang Mai, Thailand (CHTO/IU network) | Distance from quake: 1760 km / 1094 mi | Show on map | Station InfoShow moreAftershocks 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 200 km2 (77 square miles) as a first-order estimate. The length of the rupture zone thus was probably around 24 km (15 mi).[More info]Recorded aftershocks, latest first (0 quake)Aug 15, 2026 10:54 am (Universal Time)10 minutes ago - felt6.3173 km0 km - This quakeNorthern Sumatra, IndonesiaMain Shock (this quake)MoreMap of aftershocksPrevious quakes in the same area of this earthquake',6.3,63, '#bb202a', 0.9,1.5, '#bb202a', 0.27);map2.addToMap('thisQuake',2.9837,99.0339,'10 minutes ago: Mag. 6.3, Northern Sumatra, Indonesia','','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)})(); })(); (function(){let done=false;async function loadPrevious(){if(done)return;done=true;while(typeof mkRequest=="undefined")await new Promise(r=>setTimeout(r,500));mkRequest("https://server2.allquakes.com/api/getPrevious.php?quakeId=23274637","get","",function(httpObj){let r=httpObj.responseText,d=document;if(""!=r&&200==httpObj.status){let o=JSON.parse(r);if(!o){let s=d.getElementById("olderQuakesSection");if(s)s.remove();return};let table=d.getElementById("qTableOlder");if(!table)return;table.innerHTML+=o.tableRows,qTableOlder.alternateBg();let ph=d.getElementById("placeholder_largestQText");if(ph)ph.innerHTML=o.html;let wrap=d.getElementById("sectionPreviousCWrap");if(wrap)wrap.style.display="";eval(o.js)}})}let d=document,target=d.getElementById("sectionPreviousCWrap")||d.getElementById("placeholder_largestQText")||d.getElementById("qTableOlder");if(!target||!("IntersectionObserver" in window)){loadPrevious();return}let obs=new IntersectionObserver(function(entries){if(entries.some(e=>e.isIntersecting)){obs.disconnect();loadPrevious()}},{rootMargin:"300px 0px"});obs.observe(target)})();]]>