Light magnitude 3.9 earthquake at 24 km depth21 Sep 06:33 UTC: First to report: EMSC after 3 minutes.21 Sep 06:36: Magnitude recalculated from 3.8 to 3.9. Hypocenter depth recalculated from 14.40 to 24.00 km (from 8.9 to 14.9 mi). Epicenter location corrected by 32 km (20 mi) towards E.I didn't feel itI felt this quakeEarthquake detailsDate & timeSep 21, 2026 06:29:47 UTC - Local time at epicenterMonday, Sep 21, 2026, at 03:29 am (GMT -3)StatusconfirmedMagnitude3.90Depth24 kmEpicenter latitude / longitude22.97°S / 70.6°WProvincia de Antofagasta, Region de Antofagasta, ChileSeismic antipode22.97°N / 109.4°EChinaShaking intensityIII Weak shaking near epicenterFelt0 reportsPrimary data sourceEMSC (European-Mediterranean Seismological Centre)Weather at epicenter at time of quakeScattered Clouds 17.3°C (63 F), humidity: 79%, wind: 7 m/s (13 kts) from SEstimated seismic energy released4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT) | equivalent to ONE quake of magnitude 3.9 | about seismic energy9 minutes agoSep 21, 2026 06:29 GMT / Sep 21, 2026 03:29 am (GMT -3)Lat / Lng: -22.97 / -70.6: Offshore Antofagasta, ChileSource: EMSCOther sources: CSN: 3.9 / 24 km, RaspberryShake: 3.8 / 14 kmDetail info | You felt it? - Report it!';storedMarkers.push(['quake-23379711',-22.97000,-70.60000,'9 minutes ago: Mag. 3.9, Offshore Antofagasta, Chile',html,'quakes-5-24.png',18,18,9,9,124]); 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 ChileNearby placesThe closest larger town where the quake might have been felt is Antofagasta, a city with more than 400,000 inhabitants in Chile, in 79 km (49 mi) distance south of the epicenter. People likely experienced very weak shaking there. Several 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(*)RegionCountry21 km (13 mi)SE of epicenterMejillones(pop: 14,100)III: WeakProvincia de Antofagasta, Region de AntofagastaChile79 km (49 mi)S of epicenterAntofagasta(pop: 401,100)II: Very weakRegion de AntofagastaChile88 km (54 mi)SE of epicenterBaquedano(pop: 858)II: Very weakProvincia de Antofagasta, Region de AntofagastaChile106 km (66 mi)NE of epicenterTocopilla(pop: 25,400)II: Very weakRegion de AntofagastaChile119 km (74 mi)NE of epicenterMaria Elena(pop: 7,530)II: Very weakProvincia de Tocopilla, Region de AntofagastaChile131 km (82 mi)E of epicenterSierra Gorda(pop: 1,070)II: Very weakProvincia de Antofagasta, Region de AntofagastaChile181 km (113 mi)E of epicenterCalama(pop: 166,300)I: Not feltProvincia de El Loa, Region de AntofagastaChile183 km (113 mi)NE of epicenterQuillagua(pop: 141)I: Not feltProvincia de Tocopilla, Region de AntofagastaChile189 km (117 mi)N of epicenterCaleta Chipana(pop: 84)I: Not feltProvincia de Iquique, TarapacáChile224 km (139 mi)N of epicenterRio Seco(pop: 145)I: Not feltProvincia de Iquique, TarapacáChile246 km (153 mi)E of epicenterSan Pedro de Atacama(pop: 11,000)I: Not feltProvincia de El Loa, Region de AntofagastaChile255 km (159 mi)N of epicenterChanavayita(pop: 603)I: Not feltProvincia de Iquique, TarapacáChile266 km (165 mi)N of epicenterPlaya Quinteros(pop: 20)I: Not feltProvincia de Iquique, TarapacáChile266 km (165 mi)N of epicenterOficina Victoria(pop: 83)I: Not feltProvincia del Tamarugal, TarapacáChile271 km (169 mi)S of epicenterTaltal(pop: 11,100)I: Not feltProvincia de Antofagasta, Region de AntofagastaChile277 km (172 mi)NE of epicenterHuatacondo(pop: 55)I: Not feltProvincia del Tamarugal, TarapacáChile281 km (175 mi)N of epicenterColonia Pintados(pop: 143)I: Not feltProvincia del Tamarugal, TarapacáChile305 km (190 mi)NE of epicenterPica(pop: 9,300)I: Not feltProvincia del Tamarugal, TarapacáChile310 km (193 mi)NE of epicenterOllagüe(pop: 134)I: Not feltProvincia de El Loa, Region de AntofagastaChileNotes:(*) 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 GMT2026-09-21EpicenterAgency3.924 km15 mi06:29:47OFFSHORE ANTOFAGASTA, CHILEEMSC (European-Mediterranean Seismological Centre)3.924 km15 mi06:29:4721 km al NO de Mejillones0.5 km (0.3 mi) epicenter difference with EMSCCSN (National Seismological Center (Centro Sismológico Nacional))3.814 km8.7 mi06:29:44Near Coast of Northern Chile31 km (20 mi) epicenter difference with EMSCRaspberryShake (RaspberryShake)Earthquake statisticsAverage number of earthquakesBased on data from the past 26 years and our earthquake archive back to 1900, there are about 106 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: 0.21 quakes per year (or 1 quake every 4.9 years)Mag. 5 or higher: 2.2 quakes per yearMag. 4 or higher: 11.7 quakes per yearMag. 3 or higher: 50 quakes per year (or 4.1 quakes per month)Mag. 2 or higher: 108 quakes per year (or 9 quakes per month)Mag. 1 or higher: 110 quakes per year (or 9.2 quakes per month)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