Reviewed by USGSPeru99y ago
M7.1 earthquake 15 km SSW of Huabal, Peru
Wednesday, July 18, 1928, 19:05:09 UTC · 5.732°S, 78.982°W
A magnitude 7.1 earthquake struck 15 km SSW of Huabal, Peru on Wednesday, July 18, 1928, 19:05:09 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M7.3 on May 14, 1928.
- Magnitude
- 7.1
- Major · mw
- Depth
- 35 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
651 kilotons of TNT
That is about 43 times the Hiroshima bomb. It released about 1,365 times the energy of a magnitude 5.0.
Tectonic setting
10 km
from the nearest mapped plate boundary, between the Sunda and Australian plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
35 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 200 km
USGS has not published any M2.5+ earthquake within 200 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 10 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.516 km W of Barranca, PeruSeptember 28, 1906 · 261 km NE of this epicenter
- 7.323 km N of Bellavista, PeruMay 14, 1928 · 48 km NE of this epicenter
- 6.813 km ESE of Huangala, PeruJuly 24, 1912 · 191 km NW of this epicenter
- 6.3115 km SSW of Sechura, PeruDecember 27, 1925 · 268 km W of this epicenter
- 6.334 km NNE of Las Pirias, PeruMay 15, 1928 · 51 km NE of this epicenter
- 6.220 km WNW of Las Lomas, PeruSeptember 25, 1914 · 202 km NW of this epicenter
- 6.023 km SE of Bernal, PeruMarch 13, 1927 · 182 km W of this epicenter
- 6.0119 km WNW of Barranca, PeruMay 26, 1928 · 193 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 4 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 29 recorded deaths. The most severe:
- 1928M7.3
Chacahpoyas,Huancabamba,Cajamarca,Pinpincos
14 May 1928 · 48 km away · intensity X
29 deathsSevere damage ($5–24M)
- 1913M7.7
Gonzanama, San Pedro, Molleture
24 Feb 1913 · 268 km away · intensity VII
Severe damage ($5–24M)
- 1912M7.0
Huancabamba,Cajamarca; Ecuador: Guayaquil
24 Jul 1912 · 159 km away · intensity X
Severe damage ($5–24M)
- 1928M7.0
Peru
18 Jul 1928 · 26 km away · intensity VI
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.