M4.5 earthquake 53 km NNW of Antofagasta, Chile

Thursday, December 13, 2007, 13:58:40 UTC · 23.232°S, 70.650°W

A magnitude 4.5 earthquake struck 53 km NNW of Antofagasta, Chile on Thursday, December 13, 2007, 13:58:40 UTC, at a depth of 26.6 km (shallow). It is the strongest earthquake within 300 km since an M6.2 on December 13, 2007.

Magnitude: 4.5; Light · mb
Depth: 27 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

85 tons of TNT

That is about 1/178 of the Hiroshima bomb. A magnitude 5.0 releases about 6 times more energy.

Tectonic setting

74 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

27 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 16 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.

Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 504 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

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 · 193 km away · intensity XI
2,385 deaths$2 million damagetsunami
1953M7.4
Northern
7 Dec 1953 · 236 km away
3 deaths$7 million damage
1995M8.0
Antofagasta, Calama, Mejillones
30 Jul 1995 · 38 km away · intensity VII
3 deaths$2 million damagetsunami
1966M7.8
Taltal, Catalina
28 Dec 1966 · 252 km away · intensity VIII
3 deathsUnder $1 million damagetsunami
2007M7.7
Tocopilla, Maria Elena
14 Nov 2007 · 134 km away · intensity VIII
2 deathsSevere damage ($5–24M)tsunami
1967M7.5
Northern
21 Dec 1967 · 207 km away
1 deathModerate damage ($1–5M)tsunami

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

Nearby trackers