Reviewed by USGSChile10y ago
M4.6 earthquake 86 km W of Illapel, Chile
Saturday, December 26, 2015, 17:59:37 UTC · 31.755°S, 72.069°W
A magnitude 4.6 earthquake struck 86 km W of Illapel, Chile on Saturday, December 26, 2015, 17:59:37 UTC, at a depth of 10.0 km (shallow). It is the strongest earthquake within 300 km since an M5.0 on December 26, 2015.
- Magnitude
- 4.6
- Light · mwr
- Depth
- 10 km
- Shallow
- Felt reports
- 0
- Max intensity I
- 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
60 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
10 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 M4.5 on January 25, 2016. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 4.590 km W of Illapel, Chile10y ago · 8 km NW of this epicenter
- 4.453 km WSW of Illapel, Chile10y ago · 34 km E of this epicenter
- 4.183 km W of Illapel, Chile10y ago · 9 km N of this epicenter
- 4.187 km W of Illapel, Chile10y ago · 1 km W of this epicenter
- 3.894 km W of Illapel, Chile10y ago · 11 km NW of this epicenter
- 4.292 km W of Illapel, Chile10y ago · 6 km W of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 869 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.348 km W of Illapel, ChileSeptember 16, 2015 · 42 km NE of this epicenter
- 8.2The 1906 Valparaiso, Chile EarthquakeAugust 17, 1906 · 96 km SE of this epicenter
- 8.145 km NNW of Illapel, ChileApril 6, 1943 · 86 km NE of this epicenter
- 8.025 km WSW of Valparaíso, ChileMarch 3, 1985 · 155 km S of this epicenter
- 7.819 km NNE of Hacienda La Calera, ChileJuly 9, 1971 · 128 km SE of this epicenter
- 7.47 km SSE of La Ligua, ChileMarch 28, 1965 · 117 km SE of this epicenter
- 7.419 km S of Valparaíso, ChileMarch 4, 1985 · 166 km S of this epicenter
- 7.237 km S of San Antonio, ChileMarch 18, 1931 · 246 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 49 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 4,795 recorded deaths. The most severe:
- 1906M8.2
South Central
17 Aug 1906 · 139 km away · intensity XI
4,000 deaths$100 million damagetsunami
- 1965M7.3
Central
28 Mar 1965 · 109 km away
400 deaths$125 million damage
- 1985M8.0
Central Coast, San Antonio, Valparaiso
3 Mar 1985 · 157 km away · intensity VIII
180 deaths$1.5 billion damagetsunami
- 1971M7.8
Central
9 Jul 1971 · 116 km away · intensity IX
83 deaths$236 million damagetsunami
- 1822M8.5
Valparaiso, Quillota, Concon, Aconcagua
20 Nov 1822 · 139 km away · intensity XI
72 deathsExtreme damage ($25M+)tsunami
- 2015M8.3
Central
16 Sep 2015 · 43 km away · intensity IX
15 deaths$600 million damagetsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.