Reviewed by USGSChile31y ago
M4.4 earthquake 66 km S of Antofagasta, Chile
Friday, August 18, 1995, 06:36:55 UTC · 24.250°S, 70.367°W
A magnitude 4.4 earthquake struck 66 km S of Antofagasta, Chile on Friday, August 18, 1995, 06:36:55 UTC, at a depth of 30.0 km (shallow).
- Magnitude
- 4.4
- Light · mb
- Depth
- 30 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
60 tons of TNT
That is about 1/251 of the Hiroshima bomb. A magnitude 5.0 releases about 8 times more energy.
Tectonic setting
111 km
from the nearest mapped plate boundary, between the Nazca and South American plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
30 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 2 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.5 on August 31, 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 377 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 · 251 km E of this epicenter
- 8.060 km W of Diego de Almagro, ChileDecember 4, 1918 · 248 km S of this epicenter
- 8.036 km NNE of Antofagasta, ChileJuly 30, 1995 · 101 km N of this epicenter
- 7.79 km SSW of Taltal, ChileDecember 28, 1966 · 139 km S of this epicenter
- 7.684 km SSE of Antofagasta, ChileMarch 5, 1987 · 26 km SE of this epicenter
- 7.583 km NNE of Taltal, ChileJuly 13, 1936 · 56 km S of this epicenter
- 7.550 km WNW of Diego de Almagro, ChileJune 8, 1909 · 212 km S of this epicenter
- 7.454 km WSW of Diego de Almagro, ChileOctober 4, 1983 · 255 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 28 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 20 recorded deaths. The most severe:
- 1983M7.3
Northern: Copoapo-Chanaral
4 Oct 1983 · 255 km away · intensity VII
5 deaths$1 million damagetsunami
- 1953M7.4
Northern
7 Dec 1953 · 294 km away
3 deaths$7 million damage
- 1995M8.0
Antofagasta, Calama, Mejillones
30 Jul 1995 · 101 km away · intensity VII
3 deaths$2 million damagetsunami
- 1966M7.8
Taltal, Catalina
28 Dec 1966 · 143 km away · intensity VIII
3 deathsUnder $1 million damagetsunami
- 1946M7.9
Northern
2 Aug 1946 · 251 km away
2 deathsSevere damage ($5–24M)tsunami
- 1967M7.5
Northern
21 Dec 1967 · 297 km away
1 deathModerate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.