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The quake had a moderate depth of 231 km (143 mi) and was not felt (or at least not reported so).Quake Data | Interactive map | User reports | Aftershocks | Earlier quakes here | Quakes in Japan | Niigata | Nagano | ToyamaHint: Click on the image to see different maps of this quake!Moderate magnitude 4.4 earthquake at 231 km depth15 Aug 01:00 UTC: First to report: NIED after 13 minutes.I didn't feel itI felt this quakeEarthquake detailsDate & timeAug 15, 2026 00:47:17 UTC - Local time at epicenterSaturday, Aug 15, 2026, at 09:47 am (GMT +9)Statusconfirmed (manually revised)Magnitude4.4Depth231 kmEpicenter latitude / longitude37.491°N / 138.178°ENiigata, JapanSeismic antipode37.491°S / 41.822°WShaking intensityII Very weak shakingFelt0 reportsPrimary data sourceNIED (National Research Institute for Earth Science and Disaster Resilience)Nearest volcanoSekita (60 km / 37 mi)Estimated seismic energy released2.5 x 1011 joules (69.8 megawatt hours, equivalent to 60 tons of TNT) | equivalent to ONE quake of magnitude 4.4 | about seismic energy13 minutes agoAug 15, 2026 00:47 GMT / Aug 15, 2026 09:47 am (GMT +9)Lat / Lng: 37.491 / 138.178: Japan: Off S Niigata PrefSource: NIEDDetail info | You felt it? - Report it!';storedMarkers.push(['quake-23272793',37.49100,138.17800,'13 minutes ago: Mag. 4.4, Japan: Off S Niigata Pref',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 JapanNearby placesThe closest larger town where the quake might have been felt is Kashiwazaki, a town with 86,000 inhabitants in Japan, in 36 km (22 mi) distance southeast of the epicenter. People likely experienced very weak shaking there. In the capital of Japan, Tokyo, 242 km (150 mi) away from the epicenter, the earthquake could not be felt.The following table shows some of the places that might have been affected (or not) by the shaking.DistancePlaceMax. shaking intensity(*)RegionCountry36 km (22 mi)SE of epicenterKashiwazaki(pop: 86,200)II: Very weakNiigataJapan38 km (24 mi)S of epicenterJoetsu(pop: 189,400)II: Very weakJoetsu Shi, NiigataJapan45 km (28 mi)E of epicenterIzumozaki(pop: 4,110)II: Very weakSanto-gun, NiigataJapan52 km (32 mi)S of epicenterMyoko(pop: 30,400)II: Very weakNiigataJapan55 km (34 mi)S of epicenterArai(pop: 27,500)II: Very weakMyoko-shi, NiigataJapan59 km (36 mi)SW of epicenterItoigawa(pop: 40,800)II: Very weakNiigataJapan59 km (37 mi)E of epicenterOjiya(pop: 34,700)II: Very weakNiigataJapan59 km (37 mi)E of epicenterNagaoka(pop: 266,900)II: Very weakNiigataJapan61 km (38 mi)N of epicenterSado(pop: 51,500)II: Very weakNiigataJapan66 km (41 mi)SE of epicenterTokamachi(pop: 53,300)II: Very weakTokamachi-shi, NiigataJapan66 km (41 mi)E of epicenterYoshida-kasugacho(pop: 25,500)II: Very weakTsubame Shi, NiigataJapan67 km (41 mi)E of epicenterMitsuke(pop: 43,200)II: Very weakNiigataJapan68 km (42 mi)SE of epicenterOwarino(pop: 8,990)II: Very weakNakaonuma-gun, NiigataJapan68 km (43 mi)NE of epicenterMaki(pop: 29,000)II: Very weakNiigata Shi, NiigataJapan69 km (43 mi)E of epicenterTsubame(pop: 77,400)II: Very weakNiigataJapan69 km (43 mi)N of epicenterRyotsu-minato(pop: 16,400)II: Very weakSado Shi, NiigataJapan70 km (43 mi)E of epicenterSanjo(pop: 94,600)II: Very weakSanjo Shi, NiigataJapan72 km (45 mi)E of epicenterTochio-honcho(pop: 23,000)II: Very weakNagaoka Shi, NiigataJapan73 km (46 mi)S of epicenterIiyama(pop: 20,100)II: Very weakNaganoJapan75 km (46 mi)E of epicenterUonuma(pop: 34,500)II: Very weakNiigataJapan77 km (48 mi)SE of epicenterMinamiuonuma(pop: 55,400)II: Very weakNiigataJapan77 km (48 mi)S of epicenterKashiwabara(pop: 7,740)II: Very weakKamiminochi-gun, NaganoJapan78 km (48 mi)SE of epicenterShiozawa(pop: 20,200)II: Very weakMinamiuonuma Shi, NiigataJapan78 km (48 mi)E of epicenterKamo(pop: 26,000)II: Very weakNiigataJapan78 km (49 mi)SE of epicenterMuikamachi(pop: 29,100)II: Very weakMinamiuonuma Shi, NiigataJapan80 km (50 mi)E of epicenterShirone(pop: 41,400)II: Very weakNiigata Shi, NiigataJapan84 km (52 mi)S of epicenterNakano(pop: 42,700)II: Very weakNaganoJapan86 km (53 mi)SW of epicenterNyuzen(pop: 25,000)II: Very weakShimoniikawa Gun, ToyamaJapan90 km (56 mi)NE of epicenterNiigata(pop: 797,600)II: Very weakNiigataJapan90 km (56 mi)NE of epicenterNiitsu-honcho(pop: 65,900)II: Very weakNiigata Shi, NiigataJapan90 km (56 mi)E of epicenterMuramatsu(pop: 19,700)II: Very weakGosen Shi, NiigataJapan91 km (57 mi)E of epicenterGosen(pop: 48,500)II: Very weakNiigataJapan92 km (57 mi)SW of epicenterKurobe-shi(pop: 41,600)II: Very weakKurobe Shi, ToyamaJapan92 km (57 mi)NE of epicenterKameda-honcho(pop: 32,800)II: Very weakNiigata Shi, NiigataJapan93 km (58 mi)W of epicenterUshitsu(pop: 15,700)II: Very weakHosu Gun, Ishikawa-kenJapan94 km (58 mi)S of epicenterNagano(pop: 372,800)II: Very weakNaganoJapan94 km (59 mi)S of epicenterSuzaka(pop: 54,000)II: Very weakNaganoJapan100 km (62 mi)NE of epicenterAgano(pop: 40,700)II: Very weakNiigataJapan114 km (71 mi)NE of epicenterShibata(pop: 96,200)II: Very weakNiigataJapan242 km (150 mi)SE of epicenterTokyo(pop: 9,733,300)I: Not feltTokyoJapanNotes:(*) 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 GMT2026-08-15EpicenterAgency4.4231 km143 mi00:47:17OFF S NIIGATA PREFNIED (National Research Institute for Earth Science and Disaster Resilience)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 3 km2 (1 square miles) as a first-order estimate. The length of the rupture zone thus was probably around 3 km (2 mi).[More info]Recorded aftershocks, latest first (0 quake)Aug 15, 2026 09:47 am (GMT +9)13 minutes ago4.4231 km0 km - This quakeJapan: Off S Niigata PrefMain Shock (this quake)MoreMap of aftershocksPrevious quakes in the same area of this earthquake13 minutes agoAug 15, 2026 00:47 GMT / Aug 15, 2026 09:47 am (GMT +9)Lat / Lng: 37.491 / 138.178: Japan: Off S Niigata PrefSource: NIEDDetail info | You felt it? - Report it!',4.4,44, '#bb202a', 0.9,1.5, '#bb202a', 0.27);map2.addToMap('thisQuake',37.491,138.178,'13 minutes ago: Mag. 4.4, Japan: Off S Niigata Pref','Earthquake: Mag 4.4 / 231 km (143 mi) depth13 minutes agoAug 15, 2026 00:47 GMT / Aug 15, 2026 09:47 am (GMT +9)Lat / Lng: 37.491 / 138.178: Japan: Off S Niigata PrefSource: NIEDDetail 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)})(); })(); (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=23272793","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)})();]]>