M5.3 earthquake 95 km NNE of Calama, Chile

Friday, January 4, 2008, 01:26:31 UTC · 21.642°S, 68.631°W

A magnitude 5.3 earthquake struck 95 km NNE of Calama, Chile on Friday, January 4, 2008, 01:26:31 UTC, at a depth of 117.7 km (intermediate). It is the strongest earthquake within 300 km since an M5.5 on December 26, 2007.

Magnitude: 5.3; Moderate · mwc
Depth: 118 km; Intermediate
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: 75 km aftershock search area

In context

How big was it, and why here?

Energy released

1 kilotons of TNT

That is about 1/11 of the Hiroshima bomb. It released about 3 times the energy of a magnitude 5.0.

Tectonic setting

16 km

from the nearest mapped plate boundary, between the Altiplano and South American plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.

Depth: intermediate

118 km

Intermediate-depth earthquakes usually break inside a plate that is sinking into the mantle. Shaking spreads over a wide area but is gentler at the epicenter than a shallow quake of the same size.

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 75 km

USGS lists 10 M2.5+ earthquakes within 75 km in the following 30 days; the largest was M5.2 on February 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 684 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 40 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 2,408 recorded deaths. The most severe:

1877M8.3
Off North Coast
10 May 1877 · 194 km away · intensity XI
2,385 deaths$2 million damagetsunami
2005M7.7
Tarapaca
13 Jun 2005 · 193 km away
11 deaths$5 million damage
1953M7.4
Northern
7 Dec 1953 · 51 km away
3 deaths$7 million damage
1995M8.0
Antofagasta, Calama, Mejillones
30 Jul 1995 · 255 km away · intensity VII
3 deaths$2 million damagetsunami
2007M7.7
Tocopilla, Maria Elena
14 Nov 2007 · 146 km away · intensity VIII
2 deathsSevere damage ($5–24M)tsunami
1967M7.5
Northern
21 Dec 1967 · 90 km away
1 deathModerate damage ($1–5M)tsunami

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

Nearby trackers