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The quake had a moderate depth of 104 km (64 mi) and was reported felt by some people near the epicenter.Quake Data | Interactive map | User reports | Aftershocks | Earlier quakes here | Quakes in Japan | Gunma | Saitama | TochigiHint: Click on the image to see different maps of this quake!Moderate magnitude 4.4 earthquake at 104 km depth1 Aug 14:02 UTC: First to report: VolcanoDiscovery after 4 minutes.1 Aug 14:05: Now using data updates from NIEDI didn't feel itI felt this quakeEarthquake detailsDate & timeAug 1, 2025 13:58:44 UTC - Local time at epicenterFriday, Aug 1, 2025, at 10:58 pm (GMT +9)Statusconfirmed (manually revised)Magnitude4.4Depth104 kmEpicenter latitude / longitude36.24°N / 139.502°ETatebayashi Shi, Gunma, JapanSeismic antipode36.24°S / 40.498°WShaking intensityII Very weak shakingFelt2 reportsPrimary data sourceNIED (National Research Institute for Earth Science and Disaster Resilience)Nearest volcanoHakone (63 km / 39 mi)Weather at epicenter at time of quakeLight Rain 27.1°C (81 F), humidity: 75%, wind: 6 m/s (12 kts) from NNWEstimated 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 energy7 minutes ago reported feltAug 1, 2025 13:58 GMT / Aug 1, 2025 10:58 pm (GMT +9)Lat / Lng: 36.24 / 139.502: Japan: SE Gunma PrefSource: NIEDDetail info | Read user reports | You felt it? - Report it!';storedMarkers.push(['quake-22013488',36.24000,139.50200,'7 minutes ago: Mag. 4.4, Japan: SE Gunma 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 Tokyo, the capital of Japan with 8,300,000 inhabitants, in 64 km (39 mi) distance south of the epicenter. People likely experienced very weak shaking there. Many smaller towns and villages are located closer to the epicenter and might have experienced stronger shaking.The following table shows some of the places that might have been affected (or not) by the shaking.DistancePlaceMax. shaking intensity(*)RegionCountry3 km (2 mi)E of epicenterTatebayashi(pop: 81,300)II: Very weakGunmaJapan5 km (3 mi)S of epicenterOwa(pop: 25,500)II: Very weakOra-gun, GunmaJapan7 km (4 mi)W of epicenterKamikoizumi(pop: 42,100)II: Very weakOra-gun, GunmaJapan9 km (5 mi)S of epicenterHanyu(pop: 58,700)II: Very weakHanyu Shi, SaitamaJapan11 km (7 mi)W of epicenterMenuma(pop: 27,700)II: Very weakKumagaya Shi, SaitamaJapan11 km (7 mi)NE of epicenterSano(pop: 117,700)II: Very weakTochigiJapan11 km (7 mi)NW of epicenterAshikaga(pop: 143,700)II: Very weakTochigiJapan12 km (7 mi)S of epicenterGyoda(pop: 86,300)II: Very weakGyoda Shi, SaitamaJapan14 km (9 mi)NW of epicenterOta(pop: 224,400)II: Very weakOta-shi, GunmaJapan15 km (10 mi)SW of epicenterKumagaya(pop: 195,300)II: Very weakSaitamaJapan16 km (10 mi)SE of epicenterKazo(pop: 112,800)II: Very weakSaitamaJapan19 km (12 mi)S of epicenterKonosu(pop: 88,500)II: Very weakSaitamaJapan20 km (13 mi)E of epicenterKoga(pop: 139,300)II: Very weakIbarakiJapan23 km (14 mi)W of epicenterSakai-nakajima(pop: 31,300)II: Very weakIsesaki Shi, GunmaJapan23 km (14 mi)S of epicenterKitamoto(pop: 66,000)II: Very weakSaitamaJapan23 km (15 mi)NW of epicenterKiryu(pop: 109,000)II: Very weakKiryu Shi, GunmaJapan25 km (15 mi)SE of epicenterKukichuo(pop: 73,400)II: Very weakKuki-shi, SaitamaJapan26 km (16 mi)NE of epicenterTochigi(pop: 159,100)II: Very weakTochigiJapan27 km (17 mi)S of epicenterOkegawa(pop: 75,100)II: Very weakSaitamaJapan27 km (17 mi)SE of epicenterSatte(pop: 55,300)II: Very weakSaitamaJapan28 km (17 mi)E of epicenterOyama(pop: 167,600)II: Very weakTochigiJapan28 km (17 mi)W of epicenterHonjo(pop: 77,900)II: Very weakHonjo Shi, SaitamaJapan28 km (18 mi)W of epicenterIsesaki(pop: 211,900)II: Very weakGunmaJapan30 km (19 mi)NW of epicenterMidori(pop: 50,300)II: Very weakGunmaJapan32 km (20 mi)S of epicenterAgeoshimo(pop: 219,400)II: Very weakAgeo Shi, SaitamaJapan33 km (21 mi)S of epicenterSakado(pop: 96,700)II: Very weakSaitamaJapan35 km (22 mi)W of epicenterTamamura(pop: 36,400)II: Very weakSawa-gun, GunmaJapan35 km (22 mi)SE of epicenterIwatsuki(pop: 108,800)II: Very weakSaitama-shi, SaitamaJapan36 km (23 mi)SE of epicenterKasukabe(pop: 206,900)II: Very weakSaitamaJapan37 km (23 mi)S of epicenterKawagoe(pop: 337,900)II: Very weakSaitamaJapan38 km (23 mi)S of epicenterFujimino(pop: 110,100)II: Very weakKawagoe Shi, SaitamaJapan39 km (24 mi)W of epicenterFujioka(pop: 64,500)II: Very weakGunmaJapan40 km (25 mi)NE of epicenterKanuma(pop: 94,900)II: Very weakTochigiJapan41 km (26 mi)S of epicenterYono(pop: 102,400)II: Very weakSaitama-shi, SaitamaJapan42 km (26 mi)NW of epicenterMaebashi(pop: 332,100)II: Very weakGunmaJapan45 km (28 mi)W of epicenterTakasaki(pop: 373,000)II: Very weakGunmaJapan64 km (39 mi)S of epicenterTokyo(pop: 8,336,600)II: Very weakTokyoJapan82 km (51 mi)S of epicenterKawasaki(pop: 1,531,600)II: Very weakKanagawaJapanNotes:(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.User-reports for this quake (2)The first report about ground shaking reached us after only 4 minutes, before other agencies reported it. So far, we have received 2 reports for this quake from Japan. The quake was reported to have been felt in up to approx. 60 km (37 mi) distance.Most reports came from Ome, a city with more than 130,000 inhabitants in Tokyo in 56 km (35 mi) distance southwest of the epicenter, Japan. Further below is a list of places where most people reported this quake.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!Translate55.1 km SSW of epicenter [Map] / Light shaking (MMI IV) : House shaking Fussy city (57.8 km SSW of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 1-2 s : I was lying on my bed and I felt a shake List of cities/places with most reportsPlaceDistance from epicenterAverage reported Shaking IntensityNr. of reportsOme, Tokyo, Japan(Pop.: 131,895)56 km (35 mi)SW of epicenterII: Very weak shaking1Note: Only reports with latitude/longitude coordinate positions given (2 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 (*)II: Very weak shaking158–58 km (36–36 mi)58 km (36 mi)IV: Light shaking155–55 km (34–34 mi)55 km (34 mi)Notes(*) Reports are filtered to exclude those that are likely highly inaccurate or esaggerated.Only reports with latitude/longitude coordinate positions given (2 in total) could be used for geographic statistics.I 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 GMT2025-08-1EpicenterAgency4.4104 km64 mi13:58:44SE GUNMA 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 1, 2025 10:58 pm (GMT +9)7 minutes ago - felt4.4104 km0 km - This quakeJapan: SE Gunma PrefMain Shock (this quake)MoreMap of aftershocksPrevious quakes in the same area of this earthquake7 minutes ago reported feltAug 1, 2025 13:58 GMT / Aug 1, 2025 10:58 pm (GMT +9)Lat / Lng: 36.24 / 139.502: Japan: SE Gunma PrefSource: NIEDDetail info | Read user reports | You felt it? - Report it!',4.4,44, '#bb202a', 0.9,1.5, '#bb202a', 0.27);map2.addToMap('thisQuake',36.24,139.502,'7 minutes ago: Mag. 4.4, Japan: SE Gunma Pref','Earthquake: Mag 4.4 / 104 km (64 mi) depth7 minutes ago reported feltAug 1, 2025 13:58 GMT / Aug 1, 2025 10:58 pm (GMT +9)Lat / Lng: 36.24 / 139.502: Japan: SE Gunma PrefSource: NIEDDetail info | Read user reports | 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=22013488","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)}})})();]]>