Reviewed by USGSChile19y ago
M4.3 earthquake 46 km NNW of Antofagasta, Chile
Sunday, December 23, 2007, 23:07:28 UTC · 23.274°S, 70.591°W
A magnitude 4.3 earthquake struck 46 km NNW of Antofagasta, Chile on Sunday, December 23, 2007, 23:07:28 UTC, at a depth of 21.5 km (shallow).
- Magnitude
- 4.3
- Light · mb
- Depth
- 22 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 earthquakeDashed circle: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
43 tons of TNT
That is about 1/354 of the Hiroshima bomb. A magnitude 5.0 releases about 11 times more energy.
Tectonic setting
80 km
from the nearest mapped plate boundary, between the Nazca and South American plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
22 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 lists 7 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.0 on January 2, 2008. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 3.867 km NNE of Antofagasta, Chile18y ago · 44 km NE of this epicenter
- 5.061 km N of Antofagasta, Chile19y ago · 25 km NE of this epicenter
- 3.965 km N of Antofagasta, Chile19y ago · 30 km NE of this epicenter
- 3.767 km NNW of Antofagasta, Chile19y ago · 22 km N of this epicenter
- 4.355 km N of Antofagasta, Chile19y ago · 18 km NE of this epicenter
- 3.571 km N of Antofagasta, Chile19y ago · 40 km NE of this epicenter
- 4.060 km NNW of Antofagasta, Chile19y ago · 16 km N of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 515 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.2121 km SSE of San Pedro de Atacama, ChileDecember 9, 1950 · 284 km E of this epicenter
- 8.036 km NNE of Antofagasta, ChileJuly 30, 1995 · 31 km E of this epicenter
- 7.736 km ESE of Tocopilla, ChileNovember 14, 2007 · 135 km NE of this epicenter
- 7.79 km SSW of Taltal, ChileDecember 28, 1966 · 246 km S of this epicenter
- 7.684 km SSE of Antofagasta, ChileMarch 5, 1987 · 131 km S of this epicenter
- 7.583 km NNE of Taltal, ChileJuly 13, 1936 · 167 km S of this epicenter
- 7.334 km NE of Tocopilla, ChileDecember 21, 1967 · 168 km NE of this epicenter
- 7.377 km NNE of Taltal, ChileDecember 2, 1960 · 165 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 27 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 2,400 recorded deaths. The most severe:
- 1877M8.3
Off North Coast
10 May 1877 · 197 km away · intensity XI
2,385 deaths$2 million damagetsunami
- 1953M7.4
Northern
7 Dec 1953 · 234 km away
3 deaths$7 million damage
- 1995M8.0
Antofagasta, Calama, Mejillones
30 Jul 1995 · 31 km away · intensity VII
3 deaths$2 million damagetsunami
- 1966M7.8
Taltal, Catalina
28 Dec 1966 · 248 km away · intensity VIII
3 deathsUnder $1 million damagetsunami
- 2007M7.7
Tocopilla, Maria Elena
14 Nov 2007 · 135 km away · intensity VIII
2 deathsSevere damage ($5–24M)tsunami
- 1967M7.5
Northern
21 Dec 1967 · 208 km away
1 deathModerate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.