Moderate magnitude 4.0 earthquake at 18 km depth15 Sep 14:34 UTC: First to report: EMSC after 2 minutes.15 Sep 14:34: Now using data updates from USGS... [show all] ...15 Sep 14:34: Magnitude recalculated from 4.3 to 4.1.15 Sep 14:35: Hypocenter depth recalculated from 7.40 to 20.10 km (from 4.6 to 12.5 mi). Epicenter location corrected by 2.3 km (1.4 mi) towards E.15 Sep 14:35: Magnitude recalculated from 4.1 to 4.0.15 Sep 14:37: Hypocenter depth recalculated from 20.10 to 17.80 km (from 12.5 to 11.1 mi).I didn't feel itI felt this quakeEarthquake detailsDate & timeSep 15, 2026 14:32:38 UTC - Local time at epicenterTuesday, Sep 15, 2026, at 06:32 am (GMT -8)StatusconfirmedMagnitude4.00Depth17.8 kmEpicenter latitude / longitude56.191°N / 156.47°WKodiak Island Borough, Alaska, United StatesSeismic antipode56.191°S / 23.53°EShaking intensityIV Light shaking near epicenterFelt0 reportsPrimary data sourceUSGS (United States Geological Survey)Nearest volcanoYantarni (102 km / 63 mi)Weather at epicenter at time of quakeLight Rain 12°C (54 F), humidity: 96%, wind: 13 m/s (25 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 energy6 minutes agoSep 15, 2026 14:32 GMT / Sep 15, 2026 06:32 am (GMT -8)Lat / Lng: 56.191 / -156.47: 120 km E of Chignik, AlaskaSource: USGSOther sources: EMSC: 4.0 / 18 kmDetail info | You felt it? - Report it!';storedMarkers.push(['quake-23365302',56.19100,-156.47000,'6 minutes ago: Mag. 4.0, 120 km E of Chignik, Alaska',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]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 the US AlaskaNearby placesThe closest larger town where the quake might have been felt is Chignik Lagoon, a town with 78 inhabitants in the United States, in 128 km (80 mi) distance west of the epicenter. People likely experienced very weak shaking there.The following table shows some of the places that might have been affected (or not) by the shaking.DistancePlaceMax. shaking intensity(*)RegionCountry128 km (80 mi)W of epicenterChignik Lagoon(pop: 78)II: Very weakLake and Peninsula Borough, AlaskaUnited States142 km (88 mi)W of epicenterChignik Lake(pop: 73)II: Very weakLake and Peninsula Borough, AlaskaUnited States157 km (97 mi)NW of epicenterPort Heiden(pop: 98)II: Very weakLake and Peninsula Borough, AlaskaUnited States157 km (98 mi)N of epicenterUgashik(pop: 12)II: Very weakLake and Peninsula Borough, AlaskaUnited States164 km (102 mi)NE of epicenterAkhiok(pop: 72)II: Very weakKodiak Island Borough, AlaskaUnited States167 km (104 mi)NW of epicenterPilot Point(pop: 65)II: Very weakLake and Peninsula Borough, AlaskaUnited States169 km (105 mi)W of epicenterPerryville(pop: 113)II: Very weakLake and Peninsula Borough, AlaskaUnited States196 km (122 mi)NE of epicenterKarluk(pop: 37)I: Not feltKodiak Island Borough, AlaskaUnited States213 km (132 mi)NE of epicenterLarsen Bay(pop: 88)I: Not feltKodiak Island Borough, AlaskaUnited States224 km (139 mi)NE of epicenterOld Harbor(pop: 221)I: Not feltKodiak Island Borough, AlaskaUnited States232 km (144 mi)N of epicenterEgegik(pop: 106)I: Not feltLake and Peninsula Borough, AlaskaUnited States270 km (167 mi)W of epicenterSand Point(pop: 1,060)I: Not feltAleutians East Borough, AlaskaUnited States278 km (173 mi)N of epicenterKing Salmon(pop: 374)I: Not feltBristol Bay Borough, AlaskaUnited States284 km (176 mi)NE of epicenterWomens Bay(pop: 719)I: Not feltKodiak Island Borough, AlaskaUnited States284 km (177 mi)N of epicenterNaknek(pop: 544)I: Not feltBristol Bay Borough, AlaskaUnited States286 km (178 mi)NE of epicenterPort Lions(pop: 197)I: Not feltKodiak Island Borough, AlaskaUnited States293 km (182 mi)NE of epicenterKodiak Station(pop: 1,300)I: Not feltKodiak Island Borough, AlaskaUnited States295 km (183 mi)W of epicenterNelson Lagoon(pop: 52)I: Not feltAleutians East Borough, AlaskaUnited States299 km (186 mi)NE of epicenterAleneva(pop: 37)I: Not feltKodiak Island Borough, AlaskaUnited States299 km (186 mi)NE of epicenterChiniak(pop: 47)I: Not feltKodiak Island Borough, AlaskaUnited States304 km (189 mi)NE of epicenterKodiak(pop: 6,250)I: Not feltAlaskaUnited States319 km (198 mi)N of epicenterClarks Point(pop: 62)I: Not feltDillingham Census Area, AlaskaUnited States338 km (210 mi)N of epicenterDillingham(pop: 2,400)I: Not feltAlaskaUnited States347 km (215 mi)NW of epicenterManokotak(pop: 456)I: Not feltDillingham Census Area, AlaskaUnited States395 km (245 mi)NW of epicenterTogiak(pop: 842)I: Not feltDillingham Census Area, AlaskaUnited StatesNotes:(*) 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 GMT2026-09-15EpicenterAgency4.018 km11 mi14:32:38.248120 km E of Chignik, AlaskaUSGS (United States Geological Survey)4.018 km11 mi14:32:38.248ALASKA PENINSULA0 km (0 mi) epicenter difference with USGSEMSC (European-Mediterranean Seismological Centre)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)Sep 15, 2026 06:32 am (GMT -8)6 minutes ago4.018 km0 km - This quakeAlaskaMain 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 311 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 7 or higher: 0.03 quakes per year (or 1 quake every 31.3 years)Mag. 6 or higher: 0.17 quakes per year (or 1 quake every 5.8 years)Mag. 5 or higher: 0.68 quakes per year (or 1 quake every 1.5 years)Mag. 4 or higher: 4.1 quakes per yearMag. 3 or higher: 37 quakes per year (or 3.1 quakes per month)Mag. 2 or higher: 233 quakes per year (or 19.4 quakes per month)Mag. 1 or higher: 310 quakes per year (or 25.8 quakes per month)The area where this quake occurred has a very high level of seismic activity. It has had at least 4 quakes above magnitude 7 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 30 to 35 years.Number of quakes per yearPrevious quakes in the same area of this earthquake