Reviewed by USGSPeru31y ago
M4.1 earthquake 5 km SW of Coishco, Peru
Wednesday, February 28, 1996, 11:48:52 UTC · 9.062°S, 78.644°W
A magnitude 4.1 earthquake struck 5 km SW of Coishco, Peru on Wednesday, February 28, 1996, 11:48:52 UTC, at a depth of 33.0 km (shallow).
- Magnitude
- 4.1
- Light · mb
- Depth
- 33 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
21 tons of TNT
That is about 1/707 of the Hiroshima bomb. A magnitude 5.0 releases about 22 times more energy.
Tectonic setting
212 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
33 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 has not published any M2.5+ earthquake within 50 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 125 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.221 km SE of Huacho, PeruMay 24, 1940 · 274 km SE of this epicenter
- 8.167 km W of Paramonga, PeruOctober 17, 1966 · 184 km S of this epicenter
- 7.934 km SW of Chimbote, PeruMay 31, 1970 · 32 km SW of this epicenter
- 7.5123 km WSW of Puerto Santa, PeruFebruary 21, 1996 · 119 km SW of this epicenter
- 7.155 km SW of Santiago de Cao, PeruJune 21, 1937 · 139 km NW of this epicenter
- 7.0179 km WSW of Huarmey, PeruSeptember 3, 1967 · 210 km SW of this epicenter
- 6.928 km W of Paramonga, PeruSeptember 24, 1963 · 187 km S of this epicenter
- 6.86 km SSW of Quiches, PeruNovember 10, 1946 · 141 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 14 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 69,419 recorded deaths. The most severe:
- 1970M7.9
Northern, Pisco, Chiclayo
31 May 1970 · 23 km away · intensity X
66,794 deaths$530 million damagetsunami
- 1725M7.7
Trujillo, Ancash, Lima
7 Jan 1725 · 40 km away · intensity IX
1,500 deathsSevere damage ($5–24M)
- 1946M7.3
Jocaibamba,Cerro Angaschaj,Cerro Sillapata
10 Nov 1946 · 140 km away · intensity XI
800 deathsSevere damage ($5–24M)
- 1940M8.2
Peru
24 May 1940 · 241 km away · intensity X
179 deathsSevere damage ($5–24M)tsunami
- 1966M8.1
Lima,Huacho,Huaura, Chancay,Supe,San Nicolas
17 Oct 1966 · 187 km away · intensity IX
110 deaths$35 million damagetsunami
- 1937M6.5
Huancabamba,Oxapampa,El Progreso,San David
24 Dec 1937 · 288 km away · intensity X
15 deathsModerate damage ($1–5M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.