Reviewed by USGSPeru99y ago
M6.7 earthquake 41 km NE of Corani, Peru
Monday, April 9, 1928, 17:34:17 UTC · 13.595°S, 70.343°W
A magnitude 6.7 earthquake struck 41 km NE of Corani, Peru on Monday, April 9, 1928, 17:34:17 UTC, at a depth of 25.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.
- Magnitude
- 6.7
- Strong · mw
- Depth
- 25 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- VI
- Strong (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeDashed circle: 100 km aftershock search areaColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
175 kilotons of TNT
That is about 12 times the Hiroshima bomb. It released about 367 times the energy of a magnitude 5.0.
Tectonic setting
66 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
25 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 M6.5 on April 27, 1928. 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 2 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 5 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 320 recorded deaths. The most severe:
- 1707M5.8
Cuzco
17 Sep 1707 · 193 km away · intensity X
160 deaths
- 1913M6.3
Amyaraes, Abancay, Casaya, Soraya
4 Nov 1913 · 284 km away · intensity X
150 deathsSevere damage ($5–24M)
- 1928M6.7
Peru
9 Apr 1928 · 0 km away · intensity IX
10 deathsSevere damage ($5–24M)tsunami
- 1747
Carabaya Province: Ayapata
1747 · 34 km away · intensity IX
Severe damage ($5–24M)
- 1928M6.8
Esquilaya
27 Apr 1928 · 113 km away · intensity V
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.