Reviewed by USGSChile31y ago
M4.3 earthquake 31 km NW of Antofagasta, Chile
Sunday, September 10, 1995, 13:33:16 UTC · 23.428°S, 70.580°W
A magnitude 4.3 earthquake struck 31 km NW of Antofagasta, Chile on Sunday, September 10, 1995, 13:33:16 UTC, at a depth of 73.8 km (intermediate).
- Magnitude
- 4.3
- Light · mb
- Depth
- 74 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: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
43 tons of TNT
That is about 1/354 of the Hiroshima bomb. A magnitude 5.0 releases about 11 times more energy.
Tectonic setting
82 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: intermediate
74 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 50 km
USGS lists 2 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.8 on October 7, 1995. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 375 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 · 278 km E of this epicenter
- 8.036 km NNE of Antofagasta, ChileJuly 30, 1995 · 31 km E of this epicenter
- 7.79 km SSW of Taltal, ChileDecember 28, 1966 · 229 km S of this epicenter
- 7.684 km SSE of Antofagasta, ChileMarch 5, 1987 · 115 km S of this epicenter
- 7.583 km NNE of Taltal, ChileJuly 13, 1936 · 150 km S of this epicenter
- 7.334 km NE of Tocopilla, ChileDecember 21, 1967 · 184 km N of this epicenter
- 7.377 km NNE of Taltal, ChileDecember 2, 1960 · 148 km S of this epicenter
- 7.272 km N of Taltal, ChileFebruary 5, 1988 · 148 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 2,398 recorded deaths. The most severe:
- 1877M8.3
Off North Coast
10 May 1877 · 215 km away · intensity XI
2,385 deaths$2 million damagetsunami
- 1953M7.4
Northern
7 Dec 1953 · 243 km away
3 deaths$7 million damage
- 1995M8.0
Antofagasta, Calama, Mejillones
30 Jul 1995 · 31 km away · intensity VII
3 deaths$2 million damagetsunami
- 1966M7.8
Taltal, Catalina
28 Dec 1966 · 231 km away · intensity VIII
3 deathsUnder $1 million damagetsunami
- 1967M7.5
Northern
21 Dec 1967 · 222 km away
1 deathModerate damage ($1–5M)tsunami
- 1936M7.3
Taltal
13 Jul 1936 · 133 km away
1 deathModerate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.