Reviewed by USGSChile19y ago
M4.0 earthquake 60 km NNW of Antofagasta, Chile
Monday, December 24, 2007, 23:31:14 UTC · 23.132°S, 70.561°W
A magnitude 4.0 earthquake struck 60 km NNW of Antofagasta, Chile on Monday, December 24, 2007, 23:31:14 UTC, at a depth of 36.9 km (shallow).
- Magnitude
- 4.0
- Light · ml
- Depth
- 37 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
15 tons of TNT
That is about 1/998 of the Hiroshima bomb. A magnitude 5.0 releases about 32 times more energy.
Tectonic setting
83 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
37 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 6 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 · 35 km E of this epicenter
- 5.061 km N of Antofagasta, Chile19y ago · 13 km E of this epicenter
- 3.965 km N of Antofagasta, Chile19y ago · 17 km NE of this epicenter
- 3.767 km NNW of Antofagasta, Chile19y ago · 9 km NW of this epicenter
- 4.355 km N of Antofagasta, Chile19y ago · 10 km E of this epicenter
- 3.571 km N of Antofagasta, Chile19y ago · 27 km NE of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 538 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 · 286 km E of this epicenter
- 8.036 km NNE of Antofagasta, ChileJuly 30, 1995 · 36 km SE of this epicenter
- 7.736 km ESE of Tocopilla, ChileNovember 14, 2007 · 120 km NE of this epicenter
- 7.79 km SSW of Taltal, ChileDecember 28, 1966 · 262 km S of this epicenter
- 7.684 km SSE of Antofagasta, ChileMarch 5, 1987 · 145 km S of this epicenter
- 7.583 km NNE of Taltal, ChileJuly 13, 1936 · 181 km S of this epicenter
- 7.334 km NE of Tocopilla, ChileDecember 21, 1967 · 153 km NE of this epicenter
- 7.377 km NNE of Taltal, ChileDecember 2, 1960 · 180 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 · 182 km away · intensity XI
2,385 deaths$2 million damagetsunami
- 1953M7.4
Northern
7 Dec 1953 · 223 km away
3 deaths$7 million damage
- 1995M8.0
Antofagasta, Calama, Mejillones
30 Jul 1995 · 36 km away · intensity VII
3 deaths$2 million damagetsunami
- 1966M7.8
Taltal, Catalina
28 Dec 1966 · 264 km away · intensity VIII
3 deathsUnder $1 million damagetsunami
- 2007M7.7
Tocopilla, Maria Elena
14 Nov 2007 · 120 km away · intensity VIII
2 deathsSevere damage ($5–24M)tsunami
- 1967M7.5
Northern
21 Dec 1967 · 193 km away
1 deathModerate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.