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The quake had a very shallow depth of 32 km (20 mi) and was felt widely in the area. The shallow depth of the quake caused it to be felt more strongly near the epicenter than a deeper quake of similar magnitude would.Quake Data | Interactive map | Seismograms | User reports | Aftershocks | Earlier quakes here | Quakes in Japan | Chiba | Ibaraki | FukushimaHint: Click on the image to see different maps of this quake!Strong magnitude 5.5 earthquake at 32 km depth7 Nov 11:14 UTC: First to report: VolcanoDiscovery after 7 minutes.7 Nov 11:15: Now using data updates from EMSC7 Nov 11:23: Now using data updates from USGSUpdate Sat, 7 Nov 2026, 11:18Significant earthquake of magnitude 5.7 just reported 88 km east of Mito, JapanAn earthquake of magnitude 5.7 occurred only 10 minutes ago 88 km east of Mito, Japan, the European-Mediterranean Seismological Centre (EMSC) reported.The quake hit at a moderately shallow depth of 41. km beneath the epicenter near Mito, Mito Shi, Ibaraki, Japan, in the evening on Saturday, November 7th, 2026, at 8:07 pm local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.A second report was later issued by the German Research Centre for Geosciences (GFZ), which listed it as a magnitude 5.4 earthquake.Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.Weak shaking might have been felt in Oarai (pop. 15,800) located 76 km from the epicenter, Hitachi (pop. 174,500) 78 km away, Kashima-shi (pop. 67,000) 79 km away, Kamisu (pop. 95,500) 81 km away, Katsuta (pop. 156,000) 81 km away, Hitachi-Naka (pop. 156,600) 81 km away, Mito (pop. 270,700) 88 km away, Iwaki (pop. 357,300) 98 km away, and Chiba (pop. 979,800) 141 km away.VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.If you were or still are in this area during the quake help others with your feedback and report it here.Download the Volcanoes & Earthquakes app and get one of the fastest seismic alerts online: Android | iOSI didn't feel itI felt this quakeEarthquake detailsDate & timeNov 7, 2026 11:07:43 UTC - Local time at epicenterSaturday, Nov 7, 2026, at 08:07 pm (GMT +9)Statusconfirmed (manually revised)Magnitude5.50Depth31.8 kmEpicenter latitude / longitude36.1884°N / 141.4404°EChiba, JapanSeismic antipode36.1884°S / 38.56°WQuality88 seismic stationsShaking intensityV Moderate shaking near epicenterFelt13 reportsPrimary data sourceUSGS (United States Geological Survey)Nearest volcanoNasu (168 km / 104 mi)Weather at epicenter at time of quakeFew Clouds 11.9°C (53 F), humidity: 50%, wind: 4 m/s (7 kts) from NWEstimated seismic energy released1.1 x 1013 joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 atomic bombs!) | equivalent to ONE quake of magnitude 5.5 | about seismic energy34 minutes ago reported feltNov 7, 2026 11:07 GMT / Nov 7, 2026 08:07 pm (GMT +9)Lat / Lng: 36.1884 / 141.4404: 74 km NE of Hasaki, JapanSource: USGSOther sources: GFZ: 5.4 / 10 km, RaspberryShake: 5.6 / 10 km, 1 more...Detail info | Read user reports | You felt it? - Report it!';storedMarkers.push(['quake-23614345',36.18840,141.44040,'34 minutes ago: Mag. 5.5, 74 km NE of Hasaki, Japan',html,'quakes-7-24.png',30,30,15,15,126]); 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]Quake possibly felt by 2.1 million peopleAccording to preliminary estimates from the US Geological Survey (USGS), the quake might have been felt by over 2.1 million people across Japan. Approx. 1,600,000 people were in areas with light shaking (intensity IV), the highest intensity this quake likely produced over inhabited areas.MMI LevelShaking (2,086,200 in total)Possible damageI Not feltNoneII Very weakNoneIII Weak412,900(19.79%)Probably noneIV Light1,673,400(80.21%)None or minor onlyV ModerateMinorVI StrongMinor to ModerateVII Very strongModerateVIII SevereSignificantIX ViolentHeavyX ExtremeCatastrophicEstimated number of people exposed to shaking from the earthquake by intensity (data coverage corresponding to attached map)Map of expected ground shaking intensity according to the MMI scale (shakemap, source: USGS)Map with population density (from white to black) in the area around the quake's epicenter (source: USGS)Alert level for this earthquake: Level GREENBased on seismic and statistical models, USGS estimates that the risk of fatalities and damage from this earthquake is low. The main factors that contribute to this evaluation are:The maximum expected ground shaking from this quake was unlikely to reach dangerous levels over populated areas; it should not have surpassed intensity IV (Light) on the MMI scale significantly.A large number of people was exposed to shaking from the quake, but only to weak intensities.CommentOverall, the population in this region resides in structures that are resistant to earthquake shaking, though vulnerable structures exist. The predominant vulnerable building types are heavy wood frame and reinforced/confined masonry construction.A magnitude 6.6 earthquake 265 km s of this event struck Niigata, Japan on October 23, 2004 (UTC), with estimated population exposures of 347,000 at intensity VIII and 76,000 at intensity IX or greater, resulting in a reported 48 fatalities.Recent earthquakes in this area have caused secondary hazards such as landslides and fires that might have contributed to losses.Source: USGSGreen alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.Expected fatalitiesThe risk of fatalities from this quake is considered low and classified as Level GREEN, the lowest on a color scale from Green (low) to Red (very high). USGS estimates that there is a 90.4% chance that there are no direct fatalities as effect of shaking and a 9.1% chance that between 1 and 10 fatalities occurred. The likelihood that there are more than 10 fatalities is less than 1%.Expected economic damageThe economic impact of this earthquake is expected to be minimal or small (Level GREEN). Only light damage if any should have occurred. USGS calculates an 90.4% chance of total economic loss in the range of 0-1 million US Dollars and a 9.1% risk of losses between 1 and 10 million US Dollars. Total economic loss from this quake is not likely to surpass 1 million US Dollars (less than 1% chance). Ground shaking from this quakeMap of estimated ground shaking (source:USGS)Ground accelleration map for this quakeMap of estimated ground accelleration (source:USGS)Most recent quakes Top 20 past 24 hrs Quakes in JapanNearby placesThe closest larger town where the quake might have been felt is Mito, a city with more than 270,000 inhabitants in Japan, in 91 km (56 mi) distance west of the epicenter. People likely experienced light 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, 167 km (104 mi) away from the epicenter, the earthquake was probably felt as weak shaking.The following table shows some of the places that might have been affected (or not) by the shaking.DistancePlaceMax. shaking intensity(*)RegionCountry75 km (46 mi)SW of epicenterHasaki(pop: 39,200)IV: LightChoshi Shi, ChibaJapan75 km (46 mi)SW of epicenterChoshi(pop: 58,400)IV: LightChoshi Shi, ChibaJapan76 km (47 mi)W of epicenterKashima-shi(pop: 67,000)IV: LightIbarakiJapan77 km (48 mi)SW of epicenterKamisu(pop: 95,500)IV: LightIbarakiJapan78 km (49 mi)W of epicenterOarai(pop: 15,800)IV: LightHigashiibaraki-gun, IbarakiJapan83 km (52 mi)W of epicenterHokota(pop: 46,000)IV: LightIbarakiJapan83 km (52 mi)SW of epicenterOmigawa(pop: 25,800)IV: LightKatori-shi, ChibaJapan84 km (52 mi)W of epicenterFunaishikawa(pop: 35,300)IV: LightNaka-gun, IbarakiJapan84 km (52 mi)W of epicenterKatsuta(pop: 156,000)IV: LightHitachinaka Shi, IbarakiJapan84 km (52 mi)NW of epicenterHitachi(pop: 174,500)IV: LightIbarakiJapan84 km (52 mi)W of epicenterHitachi-Naka(pop: 156,600)IV: LightHitachinaka Shi, IbarakiJapan85 km (53 mi)W of epicenterItako(pop: 27,600)IV: LightIbarakiJapan87 km (54 mi)W of epicenterInada(pop: 53,500)IV: LightNaka-shi, IbarakiJapan87 km (54 mi)W of epicenterNamegata(pop: 32,200)IV: LightIbarakiJapan87 km (54 mi)NW of epicenterTakahagi(pop: 27,700)IV: LightIbarakiJapan88 km (55 mi)SW of epicenterAsahi(pop: 64,700)IV: LightChibaJapan91 km (56 mi)W of epicenterMito(pop: 270,700)IV: LightIbarakiJapan91 km (56 mi)W of epicenterKatori-shi(pop: 74,500)IV: LightChibaJapan91 km (56 mi)NW of epicenterKitaibaraki(pop: 41,800)IV: LightIbarakiJapan91 km (57 mi)NW of epicenterHitachi-ota(pop: 48,600)IV: LightHitachi-ota Shi, IbarakiJapan91 km (57 mi)W of epicenterSawara(pop: 47,200)IV: LightKatori-shi, ChibaJapan92 km (57 mi)W of epicenterOkunoya(pop: 34,600)IV: LightHigashiibaraki-gun, IbarakiJapan95 km (59 mi)W of epicenterOmitama(pop: 48,900)IV: LightIbarakiJapan100 km (62 mi)NW of epicenterOmiya(pop: 27,600)IV: LightHitachi-omiya Shi, IbarakiJapan100 km (62 mi)W of epicenterIshitsuka(pop: 18,100)IV: LightHigashiibaraki-gun, IbarakiJapan102 km (63 mi)NW of epicenterHitachiomiya(pop: 39,300)IV: LightHitachi-omiya Shi, IbarakiJapan105 km (65 mi)W of epicenterIshioka(pop: 73,100)IV: LightIbarakiJapan107 km (67 mi)W of epicenterKasama(pop: 73,700)IV: LightIbarakiJapan108 km (67 mi)NW of epicenterIwaki(pop: 357,300)IV: LightFukushimaJapan111 km (69 mi)SW of epicenterNarita(pop: 132,900)IV: LightChibaJapan111 km (69 mi)W of epicenterTsuchiura(pop: 144,400)IV: LightIbarakiJapan118 km (73 mi)W of epicenterRyugasaki(pop: 85,800)IV: LightRyugasaki Shi, IbarakiJapan119 km (74 mi)W of epicenterTsukuba(pop: 241,700)IV: LightIbarakiJapan120 km (75 mi)W of epicenterTsukuba(pop: 175,600)IV: LightIbarakiJapan121 km (75 mi)SW of epicenterSakura(pop: 173,700)IV: LightChibaJapan121 km (75 mi)W of epicenterInzai(pop: 105,500)IV: LightChibaJapan126 km (78 mi)W of epicenterToride(pop: 104,500)IV: LightIbarakiJapan136 km (85 mi)SW of epicenterChiba(pop: 979,800)III: WeakChibaJapan146 km (91 mi)W of epicenterUtsunomiya(pop: 518,800)III: WeakTochigiJapan167 km (104 mi)W of epicenterTokyo(pop: 9,733,300)III: WeakTokyoJapanNotes:(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.User-reports for this quake (16)The first report about ground shaking reached us after only 7 minutes, before other agencies reported it. So far, we have received 16 reports for this quake from Japan. Out of these, 13 people indicated they felt it. The quake was reported to have been felt in up to approx. 180–250 km (112–155 mi) distance.The majority of reports came from Tokyo (2 reports), the capital of Japan with 9,700,000 inhabitants in 167 km (104 mi) distance west of the epicenter, Narita (1 report), a city with more than 130,000 inhabitants in Chiba in 111 km (69 mi) distance southwest of the epicenter, and Waseda-tsurumakicho (1 report) (163 km or 102 mi to the west) in Tokyo. See the list of places where most people reported this quake further below.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!TranslateTokyo, Shinjuku (167 km WSW of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s : Second evening in a row with an earthquake. Slightly horizontally shaking on the 6th floor, wouldn't have felt it outdoors Ueno, Tokyo (153.6 km W of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 10-15 s : Light shaking felt by everyone in the house. Nothing fell or broke. Sendai, Miyagi (236.4 km NNW of epicenter) [Map] / not felt (reported through our app)Yokosuka, Kanagawa (189 km WSW of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)Takaoka, Toyama (401.9 km W of epicenter) [Map] / not felt (reported through our app)Tokyo (160.4 km WSW of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 15-20 sShinkoyasu, Yokohama, Kanagawa (177.1 km WSW of epicenter) [Map] / not felt (reported through our app)Higashi-nihombashi, Chuo, Tokyo (156.8 km WSW of epicenter) [Map] / Very weak shaking (MMI II)Sumiyoshi, Koto, Tokyo (157.4 km WSW of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 10-15 sNakano, Tokyo (168.2 km WSW of epicenter) [Map] / Weak shaking (MMI III) (reported through our iOS app)Makuhari, Chiba Shi, Chiba (139.5 km WSW of epicenter) [Map] / Very weak shaking (MMI II) / 5-10 s (reported through our iOS app)Sendai, Miyagi (241 km NNW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 30-60 sSunrise Inn Iwaki (108 km NNW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 30-60 sShinjuku (165 km WSW of epicenter) [Map] / Very weak shaking (MMI II) / 5-10 sNarita airport (105.3 km WSW of epicenter) [Map] / Very weak shaking (MMI II) : It was small but we felt it. Tokyo (157.4 km WSW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 10-15 sList of cities/places with most reportsPlaceDistance from epicenterAverage reported Shaking IntensityNr. of reportsTokyo, Tokyo, Japan(Pop.: 9,733,276)167 km (104 mi)W of epicenterIII: Weak shaking2Narita, Chiba, Japan(Pop.: 132,906)111 km (69 mi)SW of epicenterII: Very weak shaking1Waseda-tsurumakicho, Tokyo, Japan(Pop.: 5,614)163 km (102 mi)W of epicenterII: Very weak shaking1Iwaki, Fukushima, Japan(Pop.: 357,309)108 km (67 mi)NW of epicenterIV: Light shaking1Sendai, Miyagi, Japan(Pop.: 1,096,704)237 km (147 mi)N of epicenterIII: Weak shaking1Makuhari, Chiba, Japan(Pop.: 28,729)139 km (86 mi)SW of epicenterII: Very weak shaking1Nakano, Tokyo, Japan(Pop.: 344,880)168 km (105 mi)W of epicenterIII: Weak shaking1Sumiyoshi, Tokyo, Japan(Pop.: 5,055)157 km (97 mi)W of epicenterIII: Weak shaking1Higashi-nihombashi, Tokyo, Japan(Pop.: 5,628)159 km (99 mi)W of epicenterII: Very weak shaking1Kanda-awajicho, Tokyo, Japan(Pop.: 1,178)160 km (100 mi)W of epicenterIII: Weak shaking1Note: Only reports with latitude/longitude coordinate positions given (16 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 (*)I: Not felt3177–401 km (110–249 mi)271 km (169 mi)II: Very weak shaking6105–189 km (65–117 mi)154 km (95 mi)III: Weak shaking4157–241 km (98–150 mi)182 km (113 mi)IV: Light shaking3108–157 km (67–98 mi)140 km (87 mi)Notes(*) Reports are filtered to exclude those that are likely highly inaccurate or esaggerated.Only reports with latitude/longitude coordinate positions given (16 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 GMT2026-11-7EpicenterAgency5.532 km20 mi±5 km11:07:43.35574 km NE of Hasaki, JapanEpicenter uncertainty: ± 8.8 kmUSGS (United States Geological Survey)5.410 km6.2 mi(*)±3.7 km11:07:41.9±0.1sNear East Coast of Honshu, Japan2.4 km (1.5 mi) epicenter difference with USGSEpicenter uncertainty: ± 2.1 kmGFZ (German Research Centre for Geosciences)5.610 km6.2 mi(*)11:07:41Near East Coast of Honshu, Japan2.4 km (1.5 mi) epicenter difference with USGSRaspberryShake (RaspberryShake)5.710 km6.2 mi(*)11:07:41.67Near East Coast of Honshu, Japan23 km (14 mi) epicenter difference with USGSBMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)5.619 km12 mi11:07:40.815Near east coast of eastern Honshu, Japan [Sea: Japan]33 km (21 mi) epicenter difference with USGSEpicenter uncertainty: ± 4.8 kmINGV (Istituto Nazionale di Geofisica e Vulcanologia)5.532 km20 mi11:07:43.355±1.26sNEAR EAST COAST OF HONSHU, JAPAN0 km (0 mi) epicenter difference with USGSEpicenter uncertainty: ± 16 kmEMSC (European-Mediterranean Seismological Centre)Notes:(*) A depth given as 10 km often means that the the depth of the quake could be not determined with sufficient accuracy."; HTMLcontent += ""; mainMap.addToMap("station"+id, lat, lon, title,HTMLcontent); mainMap.map.panTo([lat,lon]); document.getElementById("map_canvas").scrollIntoView();}document.addEventListener("DOMContentLoaded", function () { var section = document.getElementById("seismogramSection"); if (!section) return; var images = section.querySelectorAll("img.waitBg"); if (!images.length) return; images.forEach(function(img, index){ img.addEventListener("error", function(){ // If the first image fails, hide the whole section. if (index === 0) { // Remove TOC entry var tocLink = document.querySelector('#toc .tocLink[data-href="seismogramSection"]'); if (tocLink) {tocLink.remove()} // Remove whole section section.remove(); } // Otherwise remove only this station. var plot = img.closest(".plotContainer"); if (!plot) return; var station = plot.previousElementSibling; var caption = plot.nextElementSibling; if (station) station.remove(); plot.remove(); if (caption) caption.remove(); // Remove empty "Show more" var more = document.getElementById("moreSeismograms"); if (more && !more.querySelector(".plotContainer")) { more.remove(); var btn = document.getElementById("moreSeismograms_1"); if (btn) btn.remove(); } // Hide section if nothing remains. if (!section.querySelector(".plotContainer")) { section.style.display = "none"; } }, { once: true }); });});]]>SeismogramsSeismic station: Matsushiro, Japan (MAJO/IU network) | Distance from quake: 292 km / 182 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: 0.1-5.0 Hz. Source: NSF SAGE Facility IRISWS timeseriesplot Web ServiceSeismic station: Erimo, Hokkaido Island, Japan (ERM/II network) | Distance from quake: 665 km / 413 mi | Show on map | Station InfoShow 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 32 km2 (12 square miles) as a first-order estimate. The length of the rupture zone thus was probably around 10 km (6 mi).[More info]Recorded aftershocks, latest first (0 quake)Nov 7, 2026 08:07 pm (GMT +9)34 minutes ago - felt5.532 km0 km - This quakeNorth Pacific Ocean, Chiba, 91 km E of Mito, Ibaraki, 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 3,000 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: 0.73 quakes per year (or 1 quake every 1.4 years)Mag. 5 or higher: 13.9 quakes per yearMag. 4 or higher: 63 quakes per year (or 5.2 quakes per month)Mag. 3 or higher: 173 quakes per year (or 14.4 quakes per month)Mag. 2 or higher: 575 quakes per year (or 48 quakes per month)Mag. 1 or higher: 2,200 quakes per year (or 6 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