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The quake had a shallow depth of 60 km (37 mi) and was not felt (or at least not reported so).Quake Data | Interactive map | Seismograms | User reports | Aftershocks | Earlier quakes here | Quakes in Japan | Chiba | Kanagawa | TokyoHint: Click on the image to see different maps of this quake!Moderate magnitude 4.2 earthquake at 60 km depth20 Jun 00:56 UTC: First to report: EMSC after 10 minutes.I didn't feel itI felt this quakeEarthquake detailsDate & timeJun 20, 2025 00:46:30 UTC - Local time at epicenterFriday, Jun 20, 2025, at 09:46 am (GMT +9)Statuspreliminary (automatic detection)Magnitude4.2Depth60 kmEpicenter latitude / longitude34.8°N / 140.5°EChiba, JapanSeismic antipode34.8°S / 39.5°WShaking intensityIII Weak shaking near epicenterFelt0 reportsPrimary data sourceEMSC (European-Mediterranean Seismological Centre)Nearest volcanoOshima (101 km / 63 mi)Estimated seismic energy released1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 tons of TNT) | equivalent to ONE quake of magnitude 4.2 | about seismic energy10 minutes agoJun 20, 2025 00:46 GMT / Jun 20, 2025 09:46 am (GMT +9)Lat / Lng: 34.8 / 140.5: Near East Coast of Honshu, JapanSource: EMSCDetail info | You felt it? - Report it!';storedMarkers.push(['quake-21881785',34.80000,140.50000,'10 minutes ago: Mag. 4.2, Near East Coast of Honshu, Japan',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 Chiba, a city of 1 million people in Japan, in 96 km (59 mi) distance north 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. In the capital of Japan, Tokyo, 123 km (77 mi) away from the epicenter, the earthquake was probably felt as very weak shaking.The following table shows some of the places that might have been affected (or not) by the shaking.DistancePlaceMax. shaking intensity(*)RegionCountry42 km (26 mi)NW of epicenterKatsuura(pop: 16,900)III: WeakChibaJapan49 km (30 mi)N of epicenterIsumi(pop: 35,500)III: WeakChibaJapan49 km (31 mi)NW of epicenterKamogawa(pop: 32,100)II: Very weakChibaJapan51 km (32 mi)N of epicenterOhara(pop: 20,200)II: Very weakIsumi Shi, ChibaJapan58 km (36 mi)NW of epicenterMinamiboso(pop: 35,800)II: Very weakMinamiboso Shi, ChibaJapan59 km (37 mi)NW of epicenterOtaki(pop: 8,980)II: Very weakIsumi-gun, ChibaJapan61 km (38 mi)W of epicenterTateyama(pop: 50,100)II: Very weakChibaJapan65 km (40 mi)N of epicenterIchinomiya(pop: 12,500)II: Very weakChosei-gun, ChibaJapan70 km (44 mi)N of epicenterHongo(pop: 13,800)II: Very weakChosei-gun, ChibaJapan72 km (45 mi)NW of epicenterMotona(pop: 6,990)II: Very weakAwa-gun, ChibaJapan72 km (45 mi)N of epicenterMobara(pop: 88,300)II: Very weakChibaJapan75 km (46 mi)N of epicenterUshigome(pop: 10,300)II: Very weakChosei-gun, ChibaJapan80 km (50 mi)N of epicenterOamishirasato(pop: 48,100)II: Very weakOamishirasato-shi, ChibaJapan81 km (50 mi)NW of epicenterSodegaura(pop: 64,900)II: Very weakChibaJapan81 km (51 mi)N of epicenterOami(pop: 53,200)II: Very weakSambu-gun, ChibaJapan83 km (51 mi)NW of epicenterKisarazu(pop: 136,200)II: Very weakChibaJapan84 km (52 mi)NW of epicenterKimitsu(pop: 83,100)II: Very weakChibaJapan84 km (52 mi)NW of epicenterFuttsu(pop: 51,700)II: Very weakChibaJapan84 km (52 mi)N of epicenterTogane(pop: 66,300)II: Very weakTogane Shi, ChibaJapan87 km (54 mi)NW of epicenterKurihama(pop: 53,800)II: Very weakYokosuka Shi, KanagawaJapan88 km (55 mi)NW of epicenterIchihara(pop: 283,500)II: Very weakChibaJapan89 km (55 mi)NW of epicenterMiura(pop: 51,500)II: Very weakKanagawaJapan89 km (55 mi)N of epicenterNaruto(pop: 25,700)II: Very weakSanmu Shi, ChibaJapan92 km (57 mi)N of epicenterSanmu(pop: 48,400)II: Very weakChibaJapan93 km (58 mi)NW of epicenterYokosuka(pop: 409,500)II: Very weakKanagawaJapan95 km (59 mi)N of epicenterYokoshiba(pop: 22,100)II: Very weakSambu-gun, ChibaJapan96 km (59 mi)N of epicenterChiba(pop: 979,800)II: Very weakChibaJapan96 km (59 mi)N of epicenterChiba(pop: 979,800)II: Very weakChibaJapan96 km (60 mi)N of epicenterYachimata(pop: 68,800)II: Very weakChibaJapan99 km (62 mi)N of epicenterYotsukaido(pop: 95,300)II: Very weakYotsukaido Shi, ChibaJapan99 km (62 mi)NW of epicenterHayama(pop: 31,100)II: Very weakMiura-gun, KanagawaJapan105 km (65 mi)NW of epicenterYokohama(pop: 3,761,600)II: Very weakKanagawaJapan105 km (65 mi)N of epicenterSakura(pop: 173,700)II: Very weakChibaJapan107 km (66 mi)NW of epicenterNarashino(pop: 176,200)II: Very weakChibaJapan109 km (68 mi)N of epicenterYachiyo(pop: 199,500)II: Very weakChibaJapan110 km (68 mi)NW of epicenterUrayasu(pop: 171,400)II: Very weakChibaJapan111 km (69 mi)N of epicenterNarita(pop: 132,900)II: Very weakChibaJapan117 km (73 mi)NW of epicenterKamagaya(pop: 109,900)II: Very weakChibaJapan119 km (74 mi)N of epicenterInzai(pop: 105,500)II: Very weakChibaJapan123 km (77 mi)NW of epicenterTokyo(pop: 8,336,600)II: Very weakTokyoJapanNotes:(*) 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 GMT2025-06-20EpicenterAgency4.260 km37 mi00:46:30NEAR EAST COAST OF HONSHU, JAPANEMSC (European-Mediterranean Seismological Centre)"; HTMLcontent += ""; mainMap.addToMap("station"+id, lat, lon, title,HTMLcontent); mainMap.map.panTo([lat,lon]); document.getElementById("map_canvas").scrollIntoView();}]]>SeismogramsSeismic station: Ibaraki Yasato (JYT/JP network) | Distance from quake: 162 km / 100 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: 0.2-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtoolShow 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 2 km2 (1 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)Jun 20, 2025 09:46 am (GMT +9)10 minutes ago4.260 km0 km - This quakeNear East Coast of Honshu, JapanMain Shock (this quake)MoreMap of aftershocksPrevious quakes in the same area of this earthquake10 minutes agoJun 20, 2025 00:46 GMT / Jun 20, 2025 09:46 am (GMT +9)Lat / Lng: 34.8 / 140.5: Near East Coast of Honshu, JapanSource: EMSCDetail info | You felt it? - Report it!',4.2,42, '#bb202a', 0.9,1.5, '#bb202a', 0.27);map2.addToMap('thisQuake',34.8,140.5,'10 minutes ago: Mag. 4.2, Near East Coast of Honshu, Japan','Earthquake: Mag 4.2 / 60 km (37 mi) depth10 minutes agoJun 20, 2025 00:46 GMT / Jun 20, 2025 09:46 am (GMT +9)Lat / Lng: 34.8 / 140.5: Near East Coast of Honshu, JapanSource: EMSCDetail 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=21881785","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. Re-use is generally not permitted without authorization. Contact us for licensing rights.