Reviewed by USGSPanama94y ago
M6.3 earthquake 251 km SSW of Río Grande, Panama
Saturday, May 6, 1933, 05:33:38 UTC · 5.763°N, 82.492°W
A magnitude 6.3 earthquake struck 251 km SSW of Río Grande, Panama on Saturday, May 6, 1933, 05:33:38 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M6.7 on August 20, 1927.
- Magnitude
- 6.3
- 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 earthquakeDashed circle: 100 km aftershock search area
In context
How big was it, and why here?
Energy released
41 kilotons of TNT
That is about 3 times the Hiroshima bomb. It released about 86 times the energy of a magnitude 5.0.
Tectonic setting
43 km
from the nearest mapped plate boundary, between the Cocos and Nazca 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 lists 1 M2.5+ earthquake within 100 km in the following 30 days; the largest was M5.8 on May 6, 1933. 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 16 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.245 km SW of Quebrada de Piedra, PanamaJanuary 20, 1904 · 234 km N of this epicenter
- 6.8228 km WSW of Burica, PanamaMarch 3, 1906 · 270 km NW of this epicenter
- 6.7260 km SSW of Arenas, PanamaAugust 20, 1927 · 80 km SE of this epicenter
- 6.697 km SSE of Burica, PanamaAugust 10, 1927 · 165 km N of this epicenter
- 6.5208 km S of Cambutal, PanamaDecember 2, 1904 · 221 km E of this epicenter
- 6.3192 km S of Burica, PanamaSeptember 24, 1920 · 63 km N of this epicenter
- 6.2south of PanamaAugust 15, 1929 · 83 km S of this epicenter
- 6.1136 km S of Burica, PanamaMarch 9, 1927 · 119 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 1 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1913M6.7
Azuero Peninsula
2 Oct 1913 · 257 km away
Limited damage (under $1M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.