Moderate magnitude 4.0 earthquake at 49 km depth29 Jul 19:02 UTC: First to report: VolcanoDiscovery after 4 minutes.29 Jul 19:05: Now using data updates from RaspberryShake29 Jul 19:05: Now using data updates from NIEDI didn't feel itI felt this quakeEarthquake detailsDate & timeJul 29, 2025 18:58:54 UTC - Local time at epicenterWednesday, Jul 30, 2025, at 03:58 am (GMT +9)Statusconfirmed (manually revised)Magnitude4.0Depth49 kmEpicenter latitude / longitude36.16°N / 140.083°ETsukuba Shi, Ibaraki, JapanSeismic antipode36.16°S / 39.917°WShaking intensityIII Weak shaking near epicenterFelt1 reportPrimary data sourceNIED (National Research Institute for Earth Science and Disaster Resilience)Nearest volcanoAkagi (96 km / 60 mi)Weather at epicenter at time of quakeClear Sky 26.5°C (80 F), humidity: 87%, wind: 2 m/s (4 kts) from ENEEstimated 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 energy7 minutes ago reported feltJul 29, 2025 18:58 GMT / Jul 30, 2025 03:58 am (GMT +9)Lat / Lng: 36.16 / 140.083: Japan: SW Ibaraki PrefSource: NIEDOther sources: RaspberryShake: 3.9 / 50 kmDetail info | Read user reports | You felt it? - Report it!';storedMarkers.push(['quake-22003336',36.16000,140.08300,'7 minutes ago: Mag. 4.0, Japan: SW Ibaraki 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 63 km (39 mi) distance southwest 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(*)RegionCountry5 km (3 mi)N of epicenterTsukuba(pop: 175,600)III: WeakIbarakiJapan9 km (6 mi)S of epicenterTsukuba(pop: 241,700)III: WeakIbarakiJapan11 km (7 mi)W of epicenterShimo-tsuma(pop: 42,500)III: WeakShimotsuma Shi, IbarakiJapan11 km (7 mi)SW of epicenterIshige(pop: 24,900)III: WeakJoso Shi, IbarakiJapan12 km (7 mi)N of epicenterMakabe(pop: 19,300)III: WeakSakuragawa Shi, IbarakiJapan14 km (9 mi)SE of epicenterTsuchiura(pop: 144,400)III: WeakIbarakiJapan14 km (9 mi)SE of epicenterNaka(pop: 53,100)III: WeakTsuchiura-shi, IbarakiJapan15 km (9 mi)E of epicenterKasumigaura(pop: 40,100)III: WeakIbarakiJapan17 km (10 mi)E of epicenterIshioka(pop: 73,100)III: WeakIbarakiJapan17 km (11 mi)W of epicenterYachiyo(pop: 21,000)III: WeakYuki-gun, IbarakiJapan18 km (11 mi)SE of epicenterAmi(pop: 48,600)III: WeakInashiki-gun, IbarakiJapan18 km (11 mi)SW of epicenterJoso(pop: 60,800)III: WeakJoso Shi, IbarakiJapan18 km (11 mi)NW of epicenterShimodate(pop: 63,700)III: WeakChikusei Shi, IbarakiJapan18 km (11 mi)SW of epicenterMitsukaido(pop: 41,100)III: WeakJoso Shi, IbarakiJapan20 km (12 mi)NW of epicenterChikusei(pop: 100,800)III: WeakIbarakiJapan20 km (13 mi)SW of epicenterIwai(pop: 42,500)III: WeakBando Shi, IbarakiJapan21 km (13 mi)S of epicenterTsukubamirai(pop: 49,900)III: WeakTsukuba-mirai Shi, IbarakiJapan21 km (13 mi)N of epicenterIwase(pop: 39,100)III: WeakSakuragawa Shi, IbarakiJapan22 km (14 mi)SW of epicenterBando(pop: 57,100)III: WeakBando Shi, IbarakiJapan22 km (14 mi)S of epicenterUshiku(pop: 84,700)III: WeakIbarakiJapan24 km (15 mi)NW of epicenterYuki(pop: 50,600)III: WeakYuki Shi, IbarakiJapan26 km (16 mi)S of epicenterMoriya(pop: 68,800)III: WeakIbarakiJapan29 km (18 mi)E of epicenterOmitama(pop: 48,900)III: WeakIbarakiJapan29 km (18 mi)NE of epicenterTomobe(pop: 37,100)III: WeakKasama Shi, IbarakiJapan29 km (18 mi)S of epicenterToride(pop: 104,500)III: WeakIbarakiJapan30 km (19 mi)NW of epicenterOyama(pop: 167,600)III: WeakTochigiJapan30 km (19 mi)NE of epicenterKasama(pop: 73,700)III: WeakIbarakiJapan30 km (19 mi)S of epicenterRyugasaki(pop: 85,800)III: WeakRyugasaki Shi, IbarakiJapan30 km (19 mi)SW of epicenterNoda(pop: 154,100)III: WeakChibaJapan31 km (19 mi)N of epicenterMooka(pop: 78,700)III: WeakTochigiJapan31 km (19 mi)SE of epicenterInashiki(pop: 47,000)III: WeakIbarakiJapan33 km (20 mi)W of epicenterKoga(pop: 139,300)III: WeakIbarakiJapan33 km (21 mi)S of epicenterAbiko(pop: 131,800)III: WeakChibaJapan34 km (21 mi)S of epicenterKashiwa(pop: 433,400)II: Very weakChibaJapan36 km (22 mi)SW of epicenterKasukabe(pop: 206,900)II: Very weakSaitamaJapan39 km (24 mi)NE of epicenterMito(pop: 270,700)II: Very weakIbarakiJapan47 km (29 mi)NE of epicenterKatsuta(pop: 156,000)II: Very weakHitachinaka Shi, IbarakiJapan48 km (30 mi)NE of epicenterHitachi-Naka(pop: 156,600)II: Very weakHitachinaka Shi, IbarakiJapan63 km (39 mi)SW of epicenterTokyo(pop: 8,336,600)II: Very weakTokyoJapan78 km (49 mi)SW 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 (1)The first report about ground shaking reached us after only 4 minutes, before other agencies reported it. So far, we have received 1 report for this quake from Japan.It came from near Noda, a city with more than 150,000 inhabitants in Chiba in 30 km (19 mi) distance southwest of the epicenter, Japan.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!Translate31.1 km SSW of epicenter [Map] / Light shaking (MMI IV) : Woke me up, bed shaking List of cities/places with most reportsPlaceDistance from epicenterAverage reported Shaking IntensityNr. of reportsNoda, Chiba, Japan(Pop.: 154,114)30 km (19 mi)SW of epicenterIV: Light shaking1Note: Only reports with latitude/longitude coordinate positions given (1 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 (*)IV: Light shaking131–31 km (19.3–19.3 mi)31 km (19 mi)Notes(*) Reports are filtered to exclude those that are likely highly inaccurate or esaggerated.Only reports with latitude/longitude coordinate positions given (1 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 GMT2025-07-29EpicenterAgency4.049 km30 mi18:58:54SW IBARAKI PREFNIED (National Research Institute for Earth Science and Disaster Resilience)3.950 km31 mi18:59:00Near East Coast of Honshu, Japan4.7 km (2.9 mi) epicenter difference with NIEDRaspberryShake (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 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)Jul 30, 2025 03:58 am (GMT +9)7 minutes ago4.049 km0 km - This quakeIbaraki, 63 km NE of Tokyo, Tokyo, JapanMain Shock (this quake)MoreMap of aftershocksEarthquake statisticsAverage number of earthquakesBased on data from the past 25 years and our earthquake archive back to 1900, there are about 4,100 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 62.5 years)Mag. 6 or higher: 0.33 quakes per year (or 1 quake every 3.1 years)Mag. 5 or higher: 7.3 quakes per yearMag. 4 or higher: 63 quakes per year (or 5.3 quakes per month)Mag. 3 or higher: 200 quakes per year (or 16.7 quakes per month)Mag. 2 or higher: 592 quakes per year (or 49 quakes per month)Mag. 1 or higher: 2,000 quakes per year (or 5.5 quakes per day)The area where this quake occurred has a very high level of seismic activity. It has had at least 2 quakes above magnitude 7 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 60 to 65 years.Number of quakes per yearPrevious quakes in the same area of this earthquake