Reviewed by USGSArgentina22y ago
M4.4 earthquake 16 km SE of Pomán, Argentina
Tuesday, September 28, 2004, 04:19:27 UTC · 28.500°S, 66.100°W
A magnitude 4.4 earthquake struck 16 km SE of Pomán, Argentina on Tuesday, September 28, 2004, 04:19:27 UTC, at a depth of 33.0 km (shallow).
- Magnitude
- 4.4
- Light · mb
- Depth
- 33 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- —
- No ShakeMap
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquake
In context
How big was it, and why here?
Energy released
60 tons of TNT
That is about 1/251 of the Hiroshima bomb. A magnitude 5.0 releases about 8 times more energy.
Tectonic setting
579 km
from the nearest mapped plate boundary, between the Nazca and South American plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
33 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 50 km
USGS has not published any M2.5+ earthquake within 50 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 119 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.331 km SE of Villa Atamisqui, ArgentinaDecember 7, 1912 · 249 km E of this epicenter
- 7.148 km NNW of Suncho Corral, ArgentinaJune 21, 1916 · 274 km NE of this epicenter
- 7.032 km NW of Fiambalá, ArgentinaAugust 3, 1920 · 208 km NW of this epicenter
- 6.918 km NW of Colonia Dora, ArgentinaMay 10, 1994 · 294 km E of this epicenter
- 6.944 km SSE of Suncho Corral, ArgentinaApril 29, 1994 · 279 km E of this epicenter
- 6.938 km SE of Suncho Corral, ArgentinaDecember 21, 1983 · 289 km E of this epicenter
- 6.739 km NNE of Suncho Corral, ArgentinaSeptember 9, 1967 · 298 km E of this epicenter
- 6.523 km WSW of Colonia Dora, ArgentinaOctober 31, 1985 · 287 km E of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 7 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 12 recorded deaths. The most severe:
- 1899
La Rioja
12 Apr 1899 · 225 km away · intensity VIII
11 deathsModerate damage ($1–5M)
- 2004M6.1
Catamarca
7 Sep 2004 · 27 km away
1 deathLimited damage (under $1M)
- 1908M6.5
Cordoba
22 Sep 1908 · 271 km away · intensity VII
Moderate damage ($1–5M)
- 2002M6.0
Aminga, Anillaco, Agua Blanca, Chuquis
28 May 2002 · 84 km away · intensity VIII
Moderate damage ($1–5M)
- 1817
Santiago Del Estero Province
4 Jul 1817 · 166 km away · intensity VIII
Moderate damage ($1–5M)
- 1898
Catamarca
5 Feb 1898 · 7 km away · intensity VIII
Moderate damage ($1–5M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.