Reviewed by USGS60y ago
M6.2 earthquake southern East Pacific Rise
Thursday, December 29, 1966, 11:56:21 UTC · 32.701°S, 111.889°W
A magnitude 6.2 earthquake struck southern East Pacific Rise on Thursday, December 29, 1966, 11:56:21 UTC, at a depth of 10.0 km (shallow). It is the strongest earthquake within 300 km since an M6.2 on October 12, 1964.
- Magnitude
- 6.2
- Strong · mw
- Depth
- 10 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: 100 km aftershock search area
In context
How big was it, and why here?
Energy released
26 kilotons of TNT
That is about 2 times the Hiroshima bomb. It released about 55 times the energy of a magnitude 5.0.
Tectonic setting
47 km
from the nearest mapped plate boundary, between the Juan Fernandez and Pacific 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 100 km
USGS lists 1 M2.5+ earthquake within 100 km in the following 30 days; the largest was M6.0 on December 29, 1966. 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 15 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 6.9Easter Island regionDecember 19, 1925 · 145 km NE of this epicenter
- 6.4southern East Pacific RiseJuly 25, 1949 · 145 km S of this epicenter
- 6.3southern East Pacific RiseMarch 7, 1940 · 179 km E of this epicenter
- 6.3southern East Pacific RiseNovember 16, 1962 · 89 km E of this epicenter
- 6.3southern East Pacific RiseJuly 9, 1950 · 45 km E of this epicenter
- 6.3Easter Island regionJuly 18, 1912 · 255 km N of this epicenter
- 6.2Easter Island regionOctober 12, 1964 · 178 km NE of this epicenter
- 6.2southern East Pacific RiseJuly 14, 1929 · 281 km SE of this epicenter