(Unconfirmed) Moderate magnitude 4.2 earthquake at 40 km depth20 Aug 05:35 UTC: First to report: RaspberryShake after 7 minutes.I didn't feel itI felt this quakeEarthquake detailsDate & timeAug 20, 2026 05:28:00 UTC - Local time at epicenterThursday, Aug 20, 2026, at 02:28 pm (GMT +9)Statusunconfirmed (automatic detection)Magnitude4.2Depth40 kmEpicenter latitude / longitude36.4°N / 140.9°EHitachinaka Shi, Ibaraki, JapanSeismic antipode36.4°S / 39.1°WShaking intensityIII Weak shaking near epicenterFelt0 reportsPrimary data sourceRaspberryShake (RaspberryShake)Nearest volcanoTakahara (114 km / 71 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 energy7 minutes agoAug 20, 2026 05:28 GMT / Aug 20, 2026 02:28 pm (GMT +9)Lat / Lng: 36.4 / 140.9: Near East Coast of Honshu, JapanSource: RaspberryShakeDetail info | You felt it? - Report it!';storedMarkers.push(['quake-23296484',36.40000,140.90000,'7 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 Iwaki, a city with more than 360,000 inhabitants in Japan, in 72 km (45 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, 134 km (83 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(*)RegionCountry30 km (19 mi)W of epicenterOarai(pop: 15,800)III: WeakHigashiibaraki-gun, IbarakiJapan31 km (19 mi)W of epicenterFunaishikawa(pop: 35,300)III: WeakNaka-gun, IbarakiJapan32 km (20 mi)NW of epicenterHitachi(pop: 174,500)III: WeakIbarakiJapan33 km (20 mi)W of epicenterHitachi-Naka(pop: 156,600)III: WeakHitachinaka Shi, IbarakiJapan33 km (20 mi)W of epicenterKatsuta(pop: 156,000)III: WeakHitachinaka Shi, IbarakiJapan34 km (21 mi)W of epicenterInada(pop: 53,500)III: WeakNaka-shi, IbarakiJapan37 km (23 mi)NW of epicenterHitachi-ota(pop: 48,600)III: WeakHitachi-ota Shi, IbarakiJapan39 km (24 mi)NW of epicenterTakahagi(pop: 27,700)III: WeakIbarakiJapan41 km (25 mi)W of epicenterMito(pop: 270,700)III: WeakIbarakiJapan44 km (27 mi)SW of epicenterHokota(pop: 46,000)III: WeakIbarakiJapan45 km (28 mi)N of epicenterKitaibaraki(pop: 41,800)III: WeakIbarakiJapan45 km (28 mi)W of epicenterOkunoya(pop: 34,600)III: WeakHigashiibaraki-gun, IbarakiJapan46 km (29 mi)W of epicenterOmiya(pop: 27,600)III: WeakHitachi-omiya Shi, IbarakiJapan47 km (29 mi)W of epicenterIshitsuka(pop: 18,100)III: WeakHigashiibaraki-gun, IbarakiJapan48 km (30 mi)W of epicenterHitachiomiya(pop: 39,300)III: WeakHitachi-omiya Shi, IbarakiJapan49 km (31 mi)W of epicenterOmitama(pop: 48,900)III: WeakIbarakiJapan54 km (33 mi)SW of epicenterKashima-shi(pop: 67,000)III: WeakIbarakiJapan54 km (34 mi)W of epicenterTomobe(pop: 37,100)III: WeakKasama Shi, IbarakiJapan57 km (35 mi)W of epicenterKasama(pop: 73,700)III: WeakIbarakiJapan57 km (35 mi)SW of epicenterNamegata(pop: 32,200)III: WeakIbarakiJapan60 km (37 mi)S of epicenterKamisu(pop: 95,500)III: WeakIbarakiJapan61 km (38 mi)SW of epicenterItako(pop: 27,600)III: WeakIbarakiJapan62 km (38 mi)SW of epicenterIshioka(pop: 73,100)III: WeakIbarakiJapan64 km (40 mi)NW of epicenterDaigo(pop: 15,700)III: WeakKuji-gun, IbarakiJapan65 km (40 mi)SW of epicenterKasumigaura(pop: 40,100)III: WeakIbarakiJapan66 km (41 mi)SW of epicenterKatori-shi(pop: 74,500)II: Very weakChibaJapan68 km (42 mi)SW of epicenterSawara(pop: 47,200)II: Very weakKatori-shi, ChibaJapan71 km (44 mi)SW of epicenterTsuchiura(pop: 144,400)II: Very weakIbarakiJapan72 km (44 mi)SW of epicenterInashiki(pop: 47,000)II: Very weakIbarakiJapan72 km (45 mi)W of epicenterIwase(pop: 39,100)II: Very weakSakuragawa Shi, IbarakiJapan72 km (45 mi)N of epicenterIwaki(pop: 357,300)II: Very weakFukushimaJapan72 km (45 mi)SW of epicenterEdosaki(pop: 20,800)II: Very weakInashiki Shi, IbarakiJapan74 km (46 mi)S of epicenterChoshi(pop: 58,400)II: Very weakChoshi Shi, ChibaJapan75 km (47 mi)SW of epicenterAmi(pop: 48,600)II: Very weakInashiki-gun, IbarakiJapan75 km (47 mi)W of epicenterTsukuba(pop: 175,600)II: Very weakIbarakiJapan76 km (47 mi)SW of epicenterNaka(pop: 53,100)II: Very weakTsuchiura-shi, IbarakiJapan79 km (49 mi)SW of epicenterTsukuba(pop: 241,700)II: Very weakIbarakiJapan79 km (49 mi)W of epicenterMooka(pop: 78,700)II: Very weakTochigiJapan79 km (49 mi)S of epicenterAsahi(pop: 64,700)II: Very weakChibaJapan134 km (83 mi)SW of epicenterTokyo(pop: 9,733,300)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!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 GMT2026-08-20EpicenterAgency4.240 km25 mi05:28:00Near East Coast of Honshu, JapanRaspberryShake (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 20, 2026 02:28 pm (GMT +9)7 minutes ago4.240 km0 km - This quakeIbaraki, JapanMain Shock (this quake)MoreMap of aftershocksEarthquake statisticsAverage number of earthquakesBased on data from the past 26 years and our earthquake archive back to 1900, there are about 4,400 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 7 or higher: 0.07 quakes per year (or 1 quake every 14.1 years)Mag. 6 or higher: 0.58 quakes per year (or 1 quake every 1.7 years)Mag. 5 or higher: 14.1 quakes per yearMag. 4 or higher: 71 quakes per year (or 5.9 quakes per month)Mag. 3 or higher: 225 quakes per year (or 18.8 quakes per month)Mag. 2 or higher: 731 quakes per year (or 61 quakes per month)Mag. 1 or higher: 2,700 quakes per year (or 7.3 quakes per day)The area where this quake occurred has a very high level of seismic activity. It has had at least 9 quakes above magnitude 7 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 10 to 15 years.Number of quakes per yearPrevious quakes in the same area of this earthquake