Reviewed by USGSIndia86y ago
M5.4 earthquake 86 km E of Port Blair, India
Wednesday, July 9, 1941, 00:39:10 UTC · 11.732°N, 93.537°E
A magnitude 5.4 earthquake struck 86 km E of Port Blair, India on Wednesday, July 9, 1941, 00:39:10 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M5.5 on July 2, 1941.
- Magnitude
- 5.4
- 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
2 kilotons of TNT
That is about 1/7 of the Hiroshima bomb. It released about 5 times the energy of a magnitude 5.0.
Tectonic setting
146 km
from the nearest mapped plate boundary, between the Sunda and Burma plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
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 27 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.043 km N of Bamboo Flat, IndiaJune 26, 1941 · 104 km W of this epicenter
- 6.5171 km S of Port Blair, IndiaApril 19, 1936 · 200 km SW of this epicenter
- 6.4Andaman Islands, India regionOctober 17, 1922 · 242 km E of this epicenter
- 6.3273 km SSE of Port Blair, IndiaOctober 21, 1916 · 265 km S of this epicenter
- 6.2112 km NE of Bamboo Flat, IndiaJuly 4, 1917 · 86 km N of this epicenter
- 6.1211 km S of Port Blair, IndiaAugust 1, 1929 · 231 km S of this epicenter
- 6.1290 km WSW of Dawei, MyanmarApril 11, 1935 · 283 km NE of this epicenter
- 6.1258 km SSE of Port Blair, IndiaOctober 7, 1938 · 244 km S 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:
- 1941M8.0
Andaman Islands,Madras; Sri Lanka: Colombo
26 Jun 1941 · 102 km away
Extreme damage ($25M+)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.