Reviewed by USGSIndia102y ago
M5.9 earthquake 78 km S of Port Blair, India
Sunday, June 28, 1925, 13:41:52 UTC · 10.961°N, 92.821°E
A magnitude 5.9 earthquake struck 78 km S of Port Blair, India on Sunday, June 28, 1925, 13:41:52 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M6.0 on May 13, 1925.
- Magnitude
- 5.9
- Moderate · 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
11 kilotons of TNT
That is about the energy of the Hiroshima bomb. It released about 23 times the energy of a magnitude 5.0.
Tectonic setting
15 km
from the nearest mapped plate boundary, between the Caribbean and Cocos 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 75 km
USGS has not published any M2.5+ earthquake within 75 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 4 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 6.3273 km SSE of Port Blair, IndiaOctober 21, 1916 · 199 km SE of this epicenter
- 6.2112 km NE of Bamboo Flat, IndiaJuly 4, 1917 · 180 km N of this epicenter
- 6.0119 km SW of Port Blair, IndiaMay 13, 1925 · 78 km W of this epicenter
- 6.097 km ESE of Port Blair, IndiaOctober 11, 1914 · 100 km NE 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:
- 1881M7.9
Andaman I,Nicobar I
31 Dec 1881 · 275 km away
Severe damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.