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The quake had a shallow depth of 40 km (25 mi) and was reported felt by some people near the epicenter.Quake Data | Interactive map | User reports | Aftershocks | Earlier quakes here | Quakes in Japan | Okinawa | Kagoshima-kenHint: Click on the image to see different maps of this quake!Moderate magnitude 4.2 earthquake at 40 km depth21 Aug 00:05 UTC: First to report: VolcanoDiscovery after 4 minutes.21 Aug 00:07: Now using data updates from EMSCI didn't feel itI felt this quakeEarthquake detailsDate & timeAug 21, 2026 00:01:30 UTC - Local time at epicenterFriday, Aug 21, 2026, at 09:01 am (GMT +9)StatusconfirmedMagnitude4.20Depth40 kmEpicenter latitude / longitude26.6°N / 127.6°EOkinawa Shi, Okinawa, JapanSeismic antipode26.6°S / 52.4°WBrazilShaking intensityIII Weak shaking near epicenterFelt2 reportsPrimary data sourceEMSC (European-Mediterranean Seismological Centre)Nearest volcanoIo-Torishima (155 km / 96 mi)Weather at epicenter at time of quakeOvercast Clouds 29.1°C (84 F), humidity: 84%, wind: 6 m/s (11 kts) from SEEstimated 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 energy7 minutes ago reported feltAug 21, 2026 00:01 GMT / Aug 21, 2026 09:01 am (GMT +9)Lat / Lng: 26.6 / 127.6: Ryukyu Islands, JapanSource: EMSCOther sources: RaspberryShake: 4.2 / 40 kmDetail info | Read user reports | You felt it? - Report it!';storedMarkers.push(['quake-23299494',26.60000,127.60000,'7 minutes ago: Mag. 4.2, Ryukyu Islands, 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 Naha, a city with more than 320,000 inhabitants in Japan, in 44 km (27 mi) distance south of the epicenter. People likely experienced 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(*)RegionCountry24 km (15 mi)NE of epicenterIe(pop: 4,190)III: WeakKunigami-gun, OkinawaJapan26 km (16 mi)SE of epicenterYomitan(pop: 41,200)III: WeakNakagami, OkinawaJapan28 km (17 mi)SE of epicenterOnna(pop: 10,900)III: WeakKunigami-gun, OkinawaJapan30 km (18 mi)SE of epicenterIshikawa(pop: 22,400)III: WeakUruma Shi, OkinawaJapan31 km (19 mi)SE of epicenterKadena(pop: 13,700)III: WeakNakagami, OkinawaJapan31 km (19 mi)E of epicenterMotobu(pop: 13,400)III: WeakKunigami-gun, OkinawaJapan36 km (22 mi)SE of epicenterOkinawa(pop: 142,800)III: WeakOkinawaJapan36 km (22 mi)SE of epicenterKin(pop: 11,300)III: WeakKunigami-gun, OkinawaJapan36 km (22 mi)SE of epicenterUruma(pop: 125,300)III: WeakOkinawaJapan37 km (23 mi)SE of epicenterChatan(pop: 28,200)III: WeakNakagami, OkinawaJapan37 km (23 mi)W of epicenterHigashi(pop: 683)III: WeakShimajiri-gun, OkinawaJapan38 km (23 mi)SE of epicenterGushikawa(pop: 65,300)III: WeakUruma Shi, OkinawaJapan38 km (24 mi)SE of epicenterKishaba(pop: 18,000)III: WeakNakagami, OkinawaJapan38 km (24 mi)E of epicenterNago(pop: 63,600)III: WeakOkinawaJapan40 km (25 mi)S of epicenterUrasoe(pop: 115,700)III: WeakOkinawaJapan40 km (25 mi)SE of epicenterKatsuren-haebaru(pop: 34,200)III: WeakUruma Shi, OkinawaJapan41 km (25 mi)SE of epicenterGinowan(pop: 100,100)III: WeakOkinawaJapan41 km (26 mi)S of epicenterNishihara(pop: 35,000)III: WeakUrasoe Shi, OkinawaJapan43 km (27 mi)SE of epicenterNakagusuku(pop: 22,200)III: WeakNakagami, OkinawaJapan44 km (27 mi)S of epicenterNaha(pop: 317,600)III: WeakOkinawaJapan47 km (29 mi)S of epicenterKanegusuku(pop: 40,400)III: WeakShimajiri-gun, OkinawaJapan47 km (29 mi)S of epicenterYonabaru(pop: 19,700)III: WeakShimajiri-gun, OkinawaJapan47 km (29 mi)S of epicenterTomigusuku(pop: 64,600)III: WeakOkinawaJapan48 km (30 mi)NE of epicenterIzena(pop: 1,520)III: WeakShimajiri-gun, OkinawaJapan51 km (32 mi)SW of epicenterZamami(pop: 924)III: WeakShimajiri-gun, OkinawaJapan53 km (33 mi)S of epicenterItoman(pop: 61,000)III: WeakOkinawaJapan53 km (33 mi)S of epicenterNanjo(pop: 44,000)III: WeakNanjo Shi, OkinawaJapan55 km (34 mi)S of epicenterYaese(pop: 30,900)III: WeakShimajiri-gun, OkinawaJapan55 km (34 mi)E of epicenterTaira(pop: 1,680)III: WeakKunigami-gun, OkinawaJapan59 km (36 mi)E of epicenterKunigami(pop: 4,910)III: WeakOkinawaJapan60 km (37 mi)NE of epicenterIheya(pop: 1,210)III: WeakOkinawaJapan84 km (52 mi)W of epicenterKumejima(pop: 7,190)II: Very weakShimajiri-gun, OkinawaJapan95 km (59 mi)NE of epicenterChabana(pop: 5,120)II: Very weakOshima-gun, Kagoshima-kenJapan126 km (78 mi)NE of epicenterChina(pop: 5,980)II: Very weakOshima-gun, Kagoshima-kenJapan178 km (111 mi)NE of epicenterIsen(pop: 6,590)II: Very weakOshima-gun, Kagoshima-kenJapan191 km (119 mi)NE of epicenterTokuwase(pop: 10,100)II: Very weakOshima-gun, Kagoshima-kenJapan270 km (168 mi)NE of epicenterNaze(pop: 41,400)I: Not feltAmami Shi, Kagoshima-kenJapan272 km (169 mi)NE of epicenterAmami(pop: 41,400)I: Not feltKagoshima-kenJapan305 km (189 mi)SW of epicenterHirara(pop: 34,400)I: Not feltMiyakojima Shi, OkinawaJapan305 km (190 mi)SW of epicenterMiyakojima(pop: 54,900)I: Not feltOkinawaJapanNotes:(*) 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. 30 km (19 mi) distance, with isolated cases to have felt the quake even 34 km (21 mi) away.Most reports came from Chatan, a town with 28,000 inhabitants in Okinawa in 37 km (23 mi) distance southeast 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!TranslateRizzan hotel tancha (26.2 km SE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Hotel 9th floor. Bed started shaking for few seconds Kadena (34 km SSE of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 1-2 s : I was sitting and felt it. List of cities/places with most reportsPlaceDistance from epicenterAverage reported Shaking IntensityNr. of reportsChatan, Okinawa, Japan(Pop.: 28,201)37 km (23 mi)SE 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 shaking134–34 km (21–21 mi)34 km (21 mi)III: Weak shaking126–26 km (16.4–16.4 mi)26 km (16 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.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 GMT2026-08-21EpicenterAgency4.240 km25 mi00:01:30RYUKYU ISLANDS, JAPANEMSC (European-Mediterranean Seismological Centre)4.240 km25 mi00:01:00Ryukyu Islands, Japan0 km (0 mi) epicenter difference with EMSCRaspberryShake (RaspberryShake)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 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)Aug 21, 2026 09:01 am (GMT +9)7 minutes ago - felt4.240 km0 km - This quakeEast China Sea, Okinawa, 23 km SW of Iejima Island, JapanMain Shock (this quake)MoreMap of aftershocksPrevious quakes in the same area of this earthquake7 minutes ago reported feltAug 21, 2026 00:01 GMT / Aug 21, 2026 09:01 am (GMT +9)Lat / Lng: 26.6 / 127.6: Ryukyu Islands, JapanSource: EMSCOther sources: RaspberryShake: 4.2 / 40 kmDetail info | Read user reports | You felt it? - Report it!',4.2,42, '#bb202a', 0.9,1.5, '#bb202a', 0.27);map2.addToMap('thisQuake',26.6,127.6,'7 minutes ago: Mag. 4.2, Ryukyu Islands, Japan','Earthquake: Mag 4.2 / 40 km (25 mi) depth7 minutes ago reported feltAug 21, 2026 00:01 GMT / Aug 21, 2026 09:01 am (GMT +9)Lat / Lng: 26.6 / 127.6: Ryukyu Islands, JapanSource: EMSCOther sources: RaspberryShake: 4.2 / 40 kmDetail 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)})(); })(); (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=23299494","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)})();]]>