Reviewed by USGSEcuador81y ago
M6.6 earthquake 61 km WSW of Jipijapa, Ecuador
Friday, March 29, 1946, 07:26:07 UTC · 1.600°S, 81.068°W
A magnitude 6.6 earthquake struck 61 km WSW of Jipijapa, Ecuador on Friday, March 29, 1946, 07:26:07 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M6.6 on July 12, 1942.
- Magnitude
- 6.6
- Strong · mw
- 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 earthquake
In context
How big was it, and why here?
Energy released
104 kilotons of TNT
That is about 7 times the Hiroshima bomb. It released about 219 times the energy of a magnitude 5.0.
Tectonic setting
51 km
from the nearest mapped plate boundary, between the Nazca and North Andes 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 100 km
USGS has not published any M2.5+ earthquake within 100 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 25 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.812 km SE of Pedernales, EcuadorMay 14, 1942 · 214 km NE of this epicenter
- 6.846 km SW of Paján, EcuadorOctober 2, 1933 · 43 km SE of this epicenter
- 6.813 km N of Muisne, EcuadorJune 30, 1916 · 285 km NE of this epicenter
- 6.629 km SE of Pedernales, EcuadorJuly 12, 1942 · 210 km NE of this epicenter
- 6.5197 km NW of Manta, EcuadorNovember 18, 1914 · 235 km NW of this epicenter
- 6.5113 km WNW of Manta, EcuadorNovember 19, 1942 · 139 km NW of this epicenter
- 6.427 km WSW of Muisne, EcuadorMay 17, 1942 · 254 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 13 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 41,240 recorded deaths. The most severe:
- 1797M8.3
Riobamba, Quito, Cuzco; Peru; Colombia
4 Feb 1797 · 267 km away · intensity XI
40,000 deathsExtreme damage ($25M+)tsunami
- 1757M7.0
Cotopaxi,Tungurahua, Latacunga
22 Feb 1757 · 285 km away · intensity IX
1,000 deathsSevere damage ($5–24M)
- 1942M7.9
Guayaquil
14 May 1942 · 106 km away · intensity IX
200 deaths$3 million damage
- 1924M6.9
Ecuador
3 Mar 1924 · 274 km away
40 deathsLimited damage (under $1M)
- 1913M7.7
Gonzanama, San Pedro, Molleture
24 Feb 1913 · 258 km away · intensity VII
Severe damage ($5–24M)
- 1944M5.5
Cotopaxi
15 Sep 1944 · 285 km away · intensity VIII
Severe damage ($5–24M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.