Moderate magnitude 4.0 earthquake at 107 km depth28 Jul 00:43 UTC: First to report: EMSC after 4 minutes.I didn't feel itI felt this quakeEarthquake detailsDate & timeJul 28, 2025 00:39:30 UTC - Local time at epicenterSunday, Jul 27, 2025, at 09:39 pm (GMT -3)Statuspreliminary (automatic detection)Magnitude4.0Depth107 kmEpicenter latitude / longitude28.52°S / 68.4°WVinchina, La Rioja Province, ArgentinaAlso near: Chile 99 km (62 mi) awaySeismic antipode28.52°N / 111.6°EChinaShaking intensityII Very weak shakingFelt0 reportsPrimary data sourceEMSC (European-Mediterranean Seismological Centre)Nearest volcanoTipas (148 km / 92 mi)Weather at epicenter at time of quakeOvercast Clouds 2.4°C (36 F), humidity: 63%, wind: 2 m/s (4 kts) from EEstimated 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 energy26 minutes agoJul 28, 2025 00:39 GMT / Jul 27, 2025 09:39 pm (GMT -3)Lat / Lng: -28.52 / -68.4: LA Rioja, ArgentinaSource: EMSCDetail info | You felt it? - Report it!';storedMarkers.push(['quake-21998153',-28.52000,-68.40000,'26 minutes ago: Mag. 4.0, LA Rioja, Argentina',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 ArgentinaNearby placesThe closest larger town where the quake might have been felt is Vinchina, a town with 2,800 inhabitants in Argentina, in 33 km (20 mi) distance southeast 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(*)RegionCountry33 km (20 mi)SE of epicenterVinchina(pop: 2,830)II: Very weakLa Rioja ProvinceArgentina96 km (60 mi)NE of epicenterTinogasta(pop: 14,500)II: Very weakCatamarca ProvinceArgentina113 km (70 mi)SE of epicenterChilecito(pop: 42,200)II: Very weakLa Rioja ProvinceArgentina122 km (76 mi)NE of epicenterFiambala(pop: 8,060)II: Very weakDepartamento de Tinogasta, Catamarca ProvinceArgentina153 km (95 mi)NE of epicenterLondres(pop: 2,630)I: Not feltBelen, Catamarca ProvinceArgentina157 km (98 mi)E of epicenterArauco(pop: 13,700)I: Not feltLa Rioja ProvinceArgentina159 km (99 mi)SE of epicenterVilla Bustos(pop: 2,170)I: Not feltSanagasta, La Rioja ProvinceArgentina174 km (108 mi)NE of epicenterPuerta de San Jose(pop: 1,070)I: Not feltBelen, Catamarca ProvinceArgentina180 km (112 mi)SE of epicenterLa Rioja(pop: 178,900)I: Not feltCapital, La Rioja ProvinceArgentina194 km (121 mi)S of epicenterSan Jose de Jachal(pop: 21,000)I: Not feltDepartamento de Jachal, San Juan ProvinceArgentina211 km (131 mi)NE of epicenterHualfin(pop: 2,300)I: Not feltBelen, Catamarca ProvinceArgentina214 km (133 mi)E of epicenterPoman(pop: 3,390)I: Not feltDepartamento de Poman, Catamarca ProvinceArgentina221 km (138 mi)E of epicenterMutquin(pop: 1,210)I: Not feltDepartamento de Poman, Catamarca ProvinceArgentina229 km (142 mi)NW of epicenterCopiapo(pop: 129,300)I: Not feltCopiapo, Region de AtacamaChile230 km (143 mi)NE of epicenterAndalgala(pop: 14,100)I: Not feltDepartamento de Andalgala, Catamarca ProvinceArgentina231 km (143 mi)W of epicenterVallenar(pop: 44,900)I: Not feltHuasco, Region de AtacamaChile237 km (148 mi)E of epicenterHuillapima(pop: 7,780)I: Not feltDepartamento de Capayan, Catamarca ProvinceArgentina252 km (157 mi)S of epicenterVilla San Agustin(pop: 6,860)I: Not feltValle Fertil, San Juan ProvinceArgentina256 km (159 mi)E of epicenterCatamarca(pop: 159,100)I: Not feltDepartamento de Capital, Catamarca ProvinceArgentina256 km (159 mi)E of epicenterLos Varela(pop: 1,910)I: Not feltDepartamento de Ambato, Catamarca ProvinceArgentina270 km (168 mi)E of epicenterSan Antonio(pop: 4,290)I: Not feltPaclin, Catamarca ProvinceArgentina281 km (174 mi)SW of epicenterVicuna(pop: 13,500)I: Not feltProvincia de Elqui, Region de CoquimboChile285 km (177 mi)E of epicenterAncasti(pop: 3,080)I: Not feltCatamarca ProvinceArgentina287 km (178 mi)NW of epicenterDiego de Almagro(pop: 18,100)I: Not feltChanaral, Region de AtacamaChile288 km (179 mi)SE of epicenterChamical(pop: 13,400)I: Not feltLa Rioja ProvinceArgentina288 km (179 mi)E of epicenterLa Cocha(pop: 7,070)I: Not feltTucuman ProvinceArgentina289 km (180 mi)E of epicenterLos Altos(pop: 6,420)I: Not feltDepartamento de Santa Rosa, Catamarca ProvinceArgentina299 km (186 mi)NE of epicenterAguilares(pop: 32,500)I: Not feltDepartamento de Rio Chico, Tucuman ProvinceArgentina303 km (188 mi)E of epicenterIcano(pop: 6,860)I: Not feltDepartamento de La Paz, Catamarca ProvinceArgentina317 km (197 mi)SW of epicenterLa Serena(pop: 154,500)I: Not feltProvincia de Elqui, Region de CoquimboChile322 km (200 mi)NE of epicenterMonteros(pop: 23,800)I: Not feltTucuman ProvinceArgentina327 km (203 mi)SW of epicenterCoquimbo(pop: 161,300)I: Not feltProvincia de Elqui, Region de CoquimboChile328 km (204 mi)S of epicenterCalingasta(pop: 8,180)I: Not feltSan Juan ProvinceArgentina337 km (209 mi)NE of epicenterFamailla(pop: 31,000)I: Not feltDepartamento de Famailla, Tucuman ProvinceArgentina347 km (215 mi)NE of epicenterBella Vista(pop: 15,100)I: Not feltLeales, Tucuman ProvinceArgentina356 km (221 mi)SW of epicenterOvalle(pop: 77,100)I: Not feltProvincia de Limari, Region de CoquimboChile360 km (224 mi)NE of epicenterYerba Buena(pop: 50,800)I: Not feltTucuman ProvinceArgentina365 km (227 mi)NE of epicenterSan Miguel de Tucuman(pop: 548,900)I: Not feltDepartamento de Capital, Tucuman ProvinceArgentina368 km (228 mi)NE of epicenterTafi Viejo(pop: 48,500)I: Not feltTafi Viejo, Tucuman ProvinceArgentina373 km (232 mi)NE of epicenterAlderetes(pop: 38,500)I: Not feltDepartamento de Cruz Alta, Tucuman ProvinceArgentinaNotes:(*) 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!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 GMT2025-07-28EpicenterAgency4.0107 km66 mi00:39:30LA RIOJA, ARGENTINAEMSC (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)Jul 27, 2025 09:39 pm (GMT -3)26 minutes ago4.0107 km0 km - This quake33 km NW of Vinchina, Vinchina, La Rioja Province, ArgentinaMain Shock (this quake)MoreMap of aftershocksEarthquake statisticsAverage number of earthquakesBased on data from the past 55 years and our earthquake archive back to 1900, there are about 171 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):Mag. 6 or higher: 0.02 quakes per year (or 1 quake every 62.5 years)Mag. 5 or higher: 0.83 quakes per year (or 1 quake every 1.2 years)Mag. 4 or higher: 9.7 quakes per yearMag. 3 or higher: 58 quakes per year (or 4.9 quakes per month)Mag. 2 or higher: 171 quakes per year (or 14.3 quakes per month)The area where this quake occurred has a high level of seismic activity. It has had at least 2 quakes above magnitude 6 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 earthquakeThe earthquake occurred 5 weeks after a magnitude 4.8 earthquake had hit on Monday, Jun 23, 2025, at 10:53 pm local time (America/Argentina/La Rioja GMT -3) in 85 km (53 mi) distance to the south:Mag. 4.8 earthquake Coronel Felipe Varela - La Rioja Province, Argentina - Jun 23, 2025 - The largest quake near the epicenter of this quake during the 10 years before was an event of magnitude 5.8. It had occurred 9 years earlier, on Sunday, Nov 13, 2016, at 02:01 pm local time (Universal Time GMT +0) in La Rioja Province, Argentina:Mag. 5.8 earthquake Famatina - La Rioja Province, Argentina - Nov 13, 2016 - The strongest-ever (since 1900) recorded quake in this area measured magnitude 8.5. It had occurred 103 years ago earlier, on Saturday, Nov 11, 1922, at 04:32 am local time (Universal Time GMT +0) in Region de Atacama, Chile:Mag. 8.5 earthquake Copiapo - Region de Atacama, Chile - Nov 11, 1922 - Below is a list and map of larger or recent quakes that had occurred near the epicenter before this earthquake (within up to 100 km/61 mi distance, up to 300 km/183 mi for very large quakes above mag. 7). Filter and sort the list by magnitude or time.Max results102050100AllMagnitudeAll2+3+4+5+6+7+8+Time before48 hours1 week30 days1 year5 years30 yearsAny ageDate and TimeMagDepthDistanceLocationDetailsMapJun 23, 10:53 pm (La Rioja)4.846 km85 km (53 mi) to the SCoronel Felipe Varela, 84 km west of Chilecito, Chilecito, La Rioja Province, Argentina 4 reportsInfoJun 10, 02:55 pm (La Rioja)4.2109 km91 km (57 mi) to the EFamatina, 62 km north of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoMay 1, 01:04 pm (La Rioja)5.411 km90 km (56 mi) to the E 53 km S of Tinogasta, Argentina 53 reportsInfoMar 18, 05:25 pm (La Rioja)4.892 km68 km (42 mi) to the WDepartamento de General Lamadrid, 94 km northwest of Vinchina, Vinchina, La Rioja Province, ArgentinaInfoFeb 26, 06:23 pm (GMT -3)4.2114 km51 km (32 mi) to the W 79 km northwest of Vinchina, Vinchina, La Rioja Province, ArgentinaInfoJan 3, 2024 05:04 am (La Rioja)5.5117 km41 km (26 mi) to the W La Rioja, Argentina 5 reportsInfoMar 13, 2023 07:50 pm (Catamarca)5.2129 km96 km (60 mi) to the NE 15 km SSE of Tinogasta, Argentina 5 reportsInfoMar 6, 2022 06:35 am (La Rioja)5.5105 km31 km (19 mi) to the WDepartamento de General Lamadrid, 137 km northwest of Chilecito, Chilecito, La Rioja Province, Argentina 3 reportsInfoMar 5, 2020 03:57 am (La Rioja)5.4118 km88 km (55 mi) to the EFamatina, La Rioja Province, 42 km south of Tinogasta, Departamento de Tinogasta, Catamarca Province, Argentina 2 reportsInfoNov 3, 2019 10:23 am (La Rioja)5.594 km99 km (61 mi) to the SE 20 km west of Chilecito, Chilecito, La Rioja Province, Argentina 5 reportsInfoJan 28, 2018 07:11 am (La Rioja)5.179 km58 km (36 mi) to the NWVinchina, La Rioja Province, Argentina 2 reportsInfoAug 1, 2017 03:13 am (La Rioja)5.579 km32 km (20 mi) to the WDepartamento de General Lamadrid, 54 km west of Vinchina, Vinchina, La Rioja Province, Argentina 5 reportsInfoNov 13, 2016 02:01 pm (Universal Time)5.8119 km99 km (62 mi) to the EFamatina, 43 km north of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoMar 27, 2014 09:10 pm (La Rioja)5.228 km84 km (52 mi) to the SWCoronel Felipe Varela, 75 km southwest of Vinchina, Vinchina, La Rioja Province, ArgentinaInfoMar 27, 2014 08:50 pm (La Rioja)5.710 km79 km (49 mi) to the SWCoronel Felipe Varela, 69 km southwest of Vinchina, Vinchina, La Rioja Province, ArgentinaInfoApr 9, 2010 07:23 pm (La Rioja)5.8118 km27 km (17 mi) to the E 24 km north of Vinchina, Vinchina, La Rioja Province, ArgentinaInfoMar 10, 2008 06:43 am (La Rioja)5.690 km90 km (56 mi) to the WDepartamento de General Lamadrid, 266 km northwest of La Rioja, Capital, La Rioja Province, ArgentinaInfoSep 12, 2006 10:30 am (La Rioja)6.0114 km68 km (42 mi) to the SWDepartamento de General Lamadrid, 138 km west of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoJul 8, 2006 06:13 am (La Rioja)5.5140 km99 km (61 mi) to the EFamatina, 68 km north of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoJun 7, 2005 11:39 pm (La Rioja)5.1122 km61 km (38 mi) to the W 88 km northwest of Vinchina, Vinchina, La Rioja Province, ArgentinaInfoOct 16, 2001 11:34 pm (La Rioja)5.4117 km51 km (31 mi) to the WVinchina, 157 km northwest of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoMar 31, 2001 03:54 am (La Rioja)5.4104 km98 km (61 mi) to the SCoronel Felipe Varela, 85 km west of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoAug 3, 1995 05:18 am (La Rioja)5.8104 km86 km (54 mi) to the W La Rioja, ArgentinaInfoMar 15, 1991 03:51 pm (La Rioja)5.3114 km73 km (46 mi) to the SCoronel Felipe Varela, 115 km west of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoMay 22, 1988 09:28 pm (La Rioja)5.4117 km25 km (15 mi) to the WVinchina, 137 km northwest of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoDec 6, 1977 09:32 pm (La Rioja)5.4124 km99 km (62 mi) to the EFamatina, 66 km north of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoNov 23, 1977 06:26 am (San Juan)7.413 km286 km (177 mi) to the S San Juan, ArgentinaInfoJan 22, 1975 07:46 am (Catamarca)5.5136 km86 km (54 mi) to the EFamatina, 91 km north of Chilecito, Chilecito, La Rioja Province, ArgentinaInfoAug 20, 1974 06:37 pm (La Rioja)5.493 km59 km (36 mi) to the WVinchina, 235 km northwest of La Rioja, Capital, La Rioja Province, ArgentinaInfoAug 4, 1973 08:22 am (La Rioja)5.495 km80 km (49 mi) to the NWVinchina, 256 km northwest of La Rioja, Capital, La Rioja Province, ArgentinaInfoMar 26, 1973 08:04 am (La Rioja)5.7117 km75 km (46 mi) to the NWVinchina, 254 km northwest of La Rioja, Capital, La Rioja Province, ArgentinaInfoSep 16, 1972 12:35 am (La Rioja)5.493 km27 km (17 mi) to the SWDepartamento de General Lamadrid, 36 km west of Vinchina, Vinchina, La Rioja Province, ArgentinaInfoMay 18, 1971 03:12 am (La Rioja)5.985 km40 km (25 mi) to the WVinchina, 219 km northwest of La Rioja, Capital, La Rioja Province, ArgentinaInfoJul 12, 1965 10:57 am (La Rioja)5.6112 km18 km (11 mi) to the NE 37 km north of Vinchina, Vinchina, La Rioja Province, ArgentinaInfoNov 29, 1943 07:37 pm (Universal Time)6.415 km90 km (56 mi) to the NE 10.7 km west of Tinogasta, Departamento de Tinogasta, Catamarca Province, ArgentinaInfoApr 18, 1939 06:22 am (Universal Time)7.435 km283 km (176 mi) to the NW 56 km west of Copiapo, Copiapo, Region de Atacama, ChileInfoNov 11, 1922 04:32 am (Universal Time)8.570 km144 km (90 mi) to the WCopiapo, 94 km east of Vallenar, Huasco, Region de Atacama, ChileInfoAug 3, 1920 07:57 pm (Universal Time)7.015 km127 km (79 mi) to the NE Catamarca, ArgentinaInfoJul 27, 1917 02:51 am (Universal Time)7.060 km316 km (196 mi) to the SWDepartamento de Calingasta, 151 km west of San Juan, Departamento de Capital, San Juan Province, ArgentinaInfoMar 19, 1904 06:28 am (Universal Time)7.00 km259 km (161 mi) to the W 53 km southwest of Vallenar, Huasco, Region de Atacama, ChileInfoMap of earlier quakes in the area of this quakeMax results102050100AllMagnitudeAll2+3+4+5+6+7+8+Time before48 hours1 week30 days1 year5 years30 yearsAny ageOldest quakes are shown in yellow, most recent in red.[quakes -][quakes +][smaller][bigger]