M4.6 earthquake in Near the coast of Tarapaca, Chile

Friday, July 18, 2014, 05:46:48 UTC · 20.186°S, 70.878°W

A magnitude 4.6 earthquake struck in Near the coast of Tarapaca, Chile on Friday, July 18, 2014, 05:46:48 UTC, at a depth of 14.8 km (shallow). It is the strongest earthquake within 300 km since an M5.0 on July 18, 2014.

Magnitude: 4.6; Light · mww
Depth: 15 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

120 tons of TNT

That is about 1/126 of the Hiroshima bomb. A magnitude 5.0 releases about 4 times more energy.

Tectonic setting

51 km

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

Depth: shallow

15 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 11 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.0 on July 21, 2014. 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 597 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 50 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 28,113 recorded deaths. The most severe:

1868M8.5
Arica
13 Aug 1868 · 177 km away · intensity XI
25,000 deaths$300 million damagetsunami
1877M8.3
Off North Coast
10 May 1877 · 151 km away · intensity XI
2,385 deaths$2 million damagetsunami
1833M7.7
Peru: Tacna; Chile: Arica
18 Sep 1833 · 216 km away · intensity VIII
700 deathsSevere damage ($5–24M)tsunami
2005M7.7
Tarapaca
13 Jun 2005 · 177 km away
11 deaths$5 million damage
2014M8.2
Northern: Iquique, Alto Hospicio
1 Apr 2014 · 65 km away · intensity VIII
7 deaths$100 million damagetsunami
1987M6.9
Arica, Iquique
8 Aug 1987 · 159 km away · intensity VII
5 deaths$1 million damage

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

Nearby trackers