Reviewed by USGSPeru30y ago
M4.4 earthquake 41 km SW of San Juan, Peru
Sunday, February 9, 1997, 07:23:47 UTC · 15.582°S, 75.473°W
A magnitude 4.4 earthquake struck 41 km SW of San Juan, Peru on Sunday, February 9, 1997, 07:23:47 UTC, at a depth of 33.0 km (shallow).
- Magnitude
- 4.4
- 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 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
27 km
from the nearest mapped plate boundary, between the Altiplano and South American plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
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 lists 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M3.7 on March 4, 1997. 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 202 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.121 km NNE of Minas de Marcona, PeruAugust 24, 1942 · 77 km NE of this epicenter
- 7.737 km SSW of Atico, PeruAugust 6, 1913 · 213 km SE of this epicenter
- 7.760 km SW of Changuillo, PeruNovember 12, 1996 · 69 km N of this epicenter
- 7.121 km SSE of Nazca, PeruJanuary 15, 1960 · 91 km NE of this epicenter
- 6.913 km SSW of San Juan, PeruOctober 3, 1916 · 158 km NE of this epicenter
- 6.7165 km SSW of Atiquipa, PeruJuly 28, 1913 · 184 km S of this epicenter
- 6.7103 km SSW of Atico, PeruSeptember 13, 1919 · 225 km SE of this epicenter
- 6.652 km SSE of Atico, PeruAugust 7, 1944 · 244 km SE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 25 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 376 recorded deaths. The most severe:
- 1821
Camana, Ocona, Caraveli
10 Jul 1821 · 274 km away · intensity VIII
162 deathsSevere damage ($5–24M)
- 1960M7.8
Arequipa,Chuquibamba,Caraveli,Cotahuasi
13 Jan 1960 · 292 km away · intensity X
63 deathsSevere damage ($5–24M)tsunami
- 1914
Pararca,Paysa,Colta,Oyala
2 Dec 1914 · 247 km away · intensity X
34 deathsSevere damage ($5–24M)
- 1813
Ica
30 Mar 1813 · 165 km away · intensity VII
32 deathsModerate damage ($1–5M)
- 1942M8.2
Ica, Nazca
24 Aug 1942 · 86 km away · intensity IX
30 deathsSevere damage ($5–24M)tsunami
- 1996M7.7
Chincha Alta, Acari, Nazca, Marcona
12 Nov 1996 · 69 km away · intensity VIII
14 deathsExtreme damage ($25M+)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.