Moderate magnitude 4.0 earthquake at 391 km depth21 Aug 11:30 UTC: First to report: NIED after 8 minutes.I didn't feel itI felt this quakeEarthquake detailsDate & timeAug 21, 2026 11:21:54 UTC - Local time at epicenterFriday, Aug 21, 2026, at 08:21 pm (GMT +9)Statusconfirmed (manually revised)Magnitude4.0Depth391 kmEpicenter latitude / longitude34.088°N / 136.759°EMie-ken, JapanSeismic antipode34.088°S / 43.241°WShaking intensityNot feltPrimary data sourceNIED (National Research Institute for Earth Science and Disaster Resilience)Nearest volcanoOntake-san (211 km / 131 mi)Weather at epicenter at time of quakeClear Sky 26.8°C (80 F), humidity: 87%, wind: 5 m/s (10 kts) from SSWEstimated seismic energy released6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 tons of TNT) | equivalent to ONE quake of magnitude 4.0 | about seismic energy17 minutes agoAug 21, 2026 11:21 GMT / Aug 21, 2026 08:21 pm (GMT +9)Lat / Lng: 34.088 / 136.759: Japan: SE Off Kii PeninsulaSource: NIEDDetail info | You felt it? - Report it!';storedMarkers.push(['quake-23300963',34.08800,136.75900,'17 minutes ago: Mag. 4.0, Japan: SE Off Kii Peninsula',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 near the epicenter is Shima, a town with 48,000 inhabitants in Japan, in 28 km (17 mi) distance to the north, but it is unlikely that the quake was felt there. DistancePlaceMax. shaking intensity(*)RegionCountry28 km (17 mi)N of epicenterShima(pop: 47,800)I: Not feltMie-kenJapan30 km (18 mi)N of epicenterMinamiise(pop: 11,000)I: Not feltWatarai-gun, Mie-kenJapan41 km (25 mi)NW of epicenterSaki(pop: 7,820)I: Not feltWatarai-gun, Mie-kenJapan41 km (26 mi)W of epicenterKihoku(pop: 14,600)I: Not feltKitamuro-gun, Mie-kenJapan44 km (28 mi)N of epicenterIse(pop: 123,500)I: Not feltMie-kenJapan45 km (28 mi)N of epicenterToba(pop: 17,700)I: Not feltMie-kenJapan45 km (28 mi)N of epicenterTamaru(pop: 15,000)I: Not feltWatarai-gun, Mie-kenJapan47 km (29 mi)NW of epicenterSawara(pop: 8,670)I: Not feltTaki-gun, Mie-kenJapan50 km (31 mi)NW of epicenterOka(pop: 14,000)I: Not feltTaki-gun, Mie-kenJapan51 km (32 mi)N of epicenterSaiku(pop: 22,400)I: Not feltTaki-gun, Mie-kenJapan52 km (32 mi)W of epicenterOwase(pop: 16,900)I: Not feltMie-kenJapan58 km (36 mi)N of epicenterMatsusaka(pop: 159,100)I: Not feltMie-kenJapan62 km (39 mi)W of epicenterKumano(pop: 16,200)I: Not feltMie-kenJapan69 km (43 mi)N of epicenterMinamichita(pop: 16,600)I: Not feltChita-gun, Aichi-kenJapan70 km (43 mi)NW of epicenterHisai-motomachi(pop: 41,600)I: Not feltTsu-shi, Mie-kenJapan71 km (44 mi)N of epicenterToyohama(pop: 21,900)I: Not feltChita-gun, Aichi-kenJapan75 km (47 mi)N of epicenterTsu(pop: 274,500)I: Not feltMie-kenJapan80 km (49 mi)NE of epicenterTahara(pop: 60,200)I: Not feltAichi-kenJapan82 km (51 mi)N of epicenterKawage(pop: 17,900)I: Not feltTsu-shi, Mie-kenJapan86 km (53 mi)NW of epicenterNabari(pop: 77,000)I: Not feltMie-kenJapan86 km (53 mi)N of epicenterTaketoyo(pop: 43,500)I: Not feltChita-gun, Aichi-kenJapan89 km (55 mi)N of epicenterTokoname(pop: 58,700)I: Not feltAichi-kenJapan89 km (56 mi)N of epicenterKameyama(pop: 49,800)I: Not feltMie-kenJapan90 km (56 mi)N of epicenterHanda(pop: 117,900)I: Not feltAichi-kenJapan90 km (56 mi)N of epicenterSuzuka(pop: 195,700)I: Not feltMie-kenJapan91 km (56 mi)N of epicenterNishio(pop: 170,000)I: Not feltAichi-kenJapan91 km (56 mi)N of epicenterHekinan(pop: 72,500)I: Not feltAichi-kenJapan94 km (58 mi)NE of epicenterGamagori(pop: 80,100)I: Not feltAichi-kenJapan94 km (58 mi)NW of epicenterIga(pop: 88,900)I: Not feltMie-kenJapan94 km (59 mi)NW of epicenterUeno-ebisumachi(pop: 61,600)I: Not feltIga-shi, Mie-kenJapan94 km (59 mi)N of epicenterTakahama(pop: 48,700)I: Not feltAichi-kenJapan95 km (59 mi)NE of epicenterToyohashi(pop: 377,500)I: Not feltAichi-kenJapan95 km (59 mi)NW of epicenterSakurai(pop: 58,400)I: Not feltNaraJapan95 km (59 mi)NE of epicenterKota(pop: 42,400)I: Not feltNukata-gun, Aichi-kenJapan98 km (61 mi)NE of epicenterKosai(pop: 59,800)I: Not feltShizuokaJapan99 km (61 mi)N of epicenterYokkaichi(pop: 305,400)I: Not feltMie-kenJapan100 km (62 mi)N of epicenterOgawa(pop: 49,600)I: Not feltChita-gun, Aichi-kenJapan100 km (62 mi)NW of epicenterKashiwara(pop: 120,900)I: Not feltGose Shi, NaraJapan134 km (83 mi)NW of epicenterOsaka(pop: 2,753,900)I: Not feltOsakaJapan321 km (200 mi)NE of epicenterTokyo(pop: 9,733,300): 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 GMT2026-08-21EpicenterAgency4.0391 km243 mi11:21:54SE OFF KII PENINSULANIED (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 1 km2 (0 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 08:21 pm (GMT +9)17 minutes ago4.0391 km0 km - This quakePhilippine Sea, 44 km S of Ise, Mie-ken, JapanMain Shock (this quake)MoreMap of aftershocksEarthquake statisticsAverage number of earthquakesBased on data from the past 56 years and our earthquake archive back to 1900, there are about 737 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 7 or higher: 0.02 quakes per year (or 1 quake every 41.7 years)Mag. 6 or higher: 0.12 quakes per year (or 1 quake every 8.4 years)Mag. 5 or higher: 0.77 quakes per year (or 1 quake every 1.3 years)Mag. 4 or higher: 20.8 quakes per yearMag. 3 or higher: 48 quakes per year (or 4 quakes per month)Mag. 2 or higher: 73 quakes per year (or 6.1 quakes per month)Mag. 1 or higher: 198 quakes per year (or 16.5 quakes per month)The area where this quake occurred has a very high level of seismic activity. It has had at least 3 quakes above magnitude 7 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 40 to 45 years.Number of quakes per yearPrevious quakes in the same area of this earthquake