A significant M5.7 earthquake struck under land 119 kilometer from Santiago del Estero in Argentina in the evening of Thursday October 2nd, 2025. Roughly 1.9 million people may have felt this earthquake.
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Earthquake Summary
The earthquake struck on land in Argentina, 119 kilometer (74 mi) north-east of Santiago del Estero. The center of this earthquake had a very deep depth of 559 km. Deep earthquakes usually have less impact than shallower earthquakes of similar strenght.
| Date and Time: | Oct 2, 2025 18:37 (Cordoba Time) - Oct 2, 2025 21:37 Universal Time. |
|---|---|
| Location: | 119 km NE of Santiago del Estero, Argentina. Coordinates 27°3'51"S 63°23'15"W. |
| Map: |  Map of area around epicenter. Click to open in Google Maps. |
| Magnitude: | MAG 5.7 Detected by 51 stations. Maximum Error Range ±0.043 . |
| Depth: | 559 km (347 mi) A very deep depth. |
| Max. Intensity: | III
Weak On the Modified Mercalli Scale. |
| Tsunami Risk: | Tsunami very unlikely Tsunami's are usually caused by MAG-6.5+ earthquakes, less than 100km shallow, and with an epicenter under sea. Neither of this seems to be the case. Always stay cautious - More info here. |
Minimal impact predicted
Based on scientific estimates by the US Geographic Survey (USGS), the risk of high fatalities for this earthquake is classified at level GREEN (low). They expect an 65% likelyhood of between 0 and 1 fatalities, and a 96% chance that the number of fatalities falls no higher than 10.
The USGS classifies the economic impact of this earthquake at level GREEN (low). They expect an 68% likelyhood of between 0 and 1 million US Dollars in economic damage and impact, and a 98% chance that the economic impact of this earthquake falls no higher than 10 million USD.
Roughly 1.9 million people exposed to shaking
This earthquake may have been felt by around 1.9 million people. That is the expected population size of the area exposed to a level of shaking of II or higher on the Modified Mercalli scale according to the USGS.
The highest earthquake impact level for this earthquake is II, which corresponds with very weak shaking and no damage. Roughly 1,872,000 people are expected to be exposed to this level. All exposure to shaking was within the borders of Argentina .
| People | MMI Level | Shaking | Damage |
|---|---|---|---|
| 727,700 | I |
Not noticable | None |
| 1,872,000 | II |
Very weak | None |
| 0 | III |
Weak | Probably none |
| 0 | IV |
Light | Likely none |
| 0 | V |
Moderate | Very light |
| 0 | VI |
Strong | Light |
| 0 | VII |
Very Strong | Moderate |
| 0 | VIII |
Severe | Moderate to heavy |
| 0 | IX |
Violent | Heavy |
| 0 | X |
Extreme | Very heavy |
Nearby towns and cities
This earthquake may have been felt in Argentina . Located 119 kilometer (74 mi) north-east of the epicenter of this earthquake, Santiago del Estero (Santiago del Estero, Argentina) is the nearest significant population center. The intensity of shaking and damage in Santiago del Estero is estimated to be around level II on the Modified Mercalli Intensity scale (very weak shaking, no damage).
Multiple major population centers exist within 300km of the earthquake that struck today. San Miguel de Tucumán is located 184 km to the west and experienced an intensity of II (very weak shaking, no damage). Santiago del Estero is located 119 km to the southwest and experienced an intensity of II (very weak shaking, no damage). Catamarca is located 283 km to the southwest (intensity unknown, possibly low).
The table below provides an overview of all places in proximity of today's earthquake. Where available, the estimated intensity on the Modified Mercalli Intensity Scale in each place is included. Places where this information is omitted likely experienced little impact.
Overview of nearby places
| Distance | Place | Intensity (MMI) |
|---|---|---|
| 119 km (74 mi) SW from epicenter |
Santiago del Estero Santiago del Estero, Argentina. |
II
Weak |
| 153 km (95 mi) WSW from epicenter |
Termas de Río Hondo Santiago del Estero, Argentina. |
II
Weak |
| 165 km (103 mi) SSE from epicenter |
Añatuya Santiago del Estero, Argentina. |
II
Weak |
| 175 km (109 mi) W from epicenter |
Alderetes Tucuman, Argentina. |
II
Weak |
| 184 km (114 mi) W from epicenter |
San Miguel de Tucumán Tucuman, Argentina. |
II
Weak |
| 189 km (117 mi) W from epicenter |
Tafí Viejo Tucuman, Argentina. |
I
Not felt |
| 190 km (118 mi) W from epicenter |
Bella Vista Tucuman, Argentina. |
II
Weak |
| 193 km (120 mi) W from epicenter |
Yerba Buena Tucuman, Argentina. |
I
Not felt |
| 200 km (124 mi) W from epicenter |
Famaillá Tucuman, Argentina. |
II
Weak |
| 209 km (130 mi) W from epicenter |
Monteros Tucuman, Argentina. |
|
| 210 km (130 mi) E from epicenter |
General Pinedo Chaco, Argentina. |
|
| 218 km (135 mi) E from epicenter |
Charata Chaco, Argentina. |
|
| 224 km (139 mi) W from epicenter |
Aguilares Tucuman, Argentina. |
|
| 228 km (142 mi) E from epicenter |
Las Breñas Chaco, Argentina. |
|
| 229 km (142 mi) NNW from epicenter |
Joaquín V. González Salta, Argentina. |
|
| 270 km (168 mi) ESE from epicenter |
Villa Ángela Chaco, Argentina. |
|
| 283 km (176 mi) SW from epicenter |
Catamarca Catamarca, Argentina. |
|
| 294 km (183 mi) E from epicenter |
Presidencia Roque Sáenz Peña Chaco, Argentina. |
Earthquake Intensity Map
The intensity in shaking and damage by this earthquake is illustrated through the map below. The highest intensity measured for this earthquake is II.
Risk of aftershocks?
This earthquake did not have any significant foreshocks nor aftershocks occurring within 100km (62 mi) of its epicenter.
Earthquakes can create aftershocks. These are generally at least 1 magnitude lower than any main shock, and as time passes the chance and strength of aftershocks decreases.
The chance that a significant earthquake like this one is followed by an even larger earthquake is not so large. On average, scientists estimate a 94% chance that a major earthquake will not be followed by an even larger one. It is still adviced to be aware of this risk
Read: How to Stay Safe during an Earthquake (cdc.gov).Earthquakes like this are common in the region
Earthquakes of this strength occur quite regularly in the region. This is the strongest earthquake to hit since August 23rd, 2023, when a 6.2 magnitude earthquake hit 22 km (14 mi) further north-northeast. An even stronger magnitude 6.8 earthquake struck on January 20th, 2023.
In total, 6 earthquakes with a magnitude of 5.7 or higher have been registered within 300km (186 mi) of this epicenter in the past 10 years. This comes down to an average of once every 2 years.
Tsunami very unlikely
It is very unlikely that this eartquake will cause any tsunami's. The reported magnitude is lower than the MAG-6.5 strength required to cause any earthquakes. In addition, this earthquake was not very shallow and appears to have occurred under land. However always stay cautious and monitor advice from local authorities.
Tsunami Risk Factors
| Factor | Under Sea? | MAG-6.5 or stronger? | Shallow depth? |
|---|---|---|---|
| Explanation | Almost all tsunami's are caused by earthquakes with their epicenter under sea or very near the sea. However stay cautious in coastal areas as earthquakes on land may cause landslides into sea, potentially still causing a local tsunami. | Under MAG 6.5: Very unlikely to cause a tsunami. MAG 6.5 to 7.5: Destructive tsunami's do occur, but are uncommon. Likely to observe small sea level changes. MAG 7.6+: Earthquakes with these magnitudes might produce destructive tsunami's. |
Most destructive tsunami's are caused by shallow earthquakes with a depth between 0 and 100km under the surface of the earth. Deeper tsunami's are unlikely to displace to ocean floor. |
| This Earthquake | Not this earthquake. This earthquake appears to have struck on land far from any coast. |
Not this earthquake. This earthquake had a magnitude of 5.7. Earthquakes of this strength are unlikely to trigger a tsunami. |
Not this earthquake. This earthquake occurred at a depth of 559 km (347 mi). Earthquakes this deep in the earth are unlikely to trigger a tsunami. |
Sources
Last updated 01/12/25 05:58 (). This article contains currently available information about the earthquake and is automatically composed. We continue to update this article up to a few days after the earthquake occurred.
- US Geographic Society (USGS): Earthquake us6000recz
- European-Mediterranean Seismological Centre (EMSC): Earthquake 20251002_0000375
- Geonames.org: World Cities Database
- Google Maps: Static API
- Earthquakelist.org: Historic Earthquakes Database
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