Reviewed by USGSIndia21y ago
M4.3 earthquake 299 km SSE of Port Blair, India
Wednesday, March 2, 2005, 04:34:32 UTC · 9.202°N, 93.886°E
A magnitude 4.3 earthquake struck 299 km SSE of Port Blair, India on Wednesday, March 2, 2005, 04:34:32 UTC, at a depth of 22.7 km (shallow).
- Magnitude
- 4.3
- Light · mb
- Depth
- 23 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
43 tons of TNT
That is about 1/354 of the Hiroshima bomb. A magnitude 5.0 releases about 11 times more energy.
Tectonic setting
23 km
from the nearest mapped plate boundary, between the Sunda and Burma plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
23 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 50 km
USGS has not published any M2.5+ earthquake within 50 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 470 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.2284 km WNW of Sabang, IndonesiaDecember 26, 2004 · 275 km S of this epicenter
- 7.0190 km WNW of Sabang, IndonesiaMay 17, 1955 · 264 km S of this epicenter
- 6.8238 km WNW of Sabang, IndonesiaJanuary 20, 1917 · 246 km S of this epicenter
- 6.6Nicobar Islands, India regionDecember 26, 2004 · 170 km W of this epicenter
- 6.6249 km NW of Sabang, IndonesiaMarch 5, 1921 · 202 km S of this epicenter
- 6.5171 km S of Port Blair, IndiaApril 19, 1936 · 162 km NW of this epicenter
- 6.3273 km SSE of Port Blair, IndiaOctober 21, 1916 · 35 km NW of this epicenter
- 6.3Nicobar Islands, India regionOctober 25, 1970 · 12 km S 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. The most severe:
- 1881M7.9
Andaman I,Nicobar I
31 Dec 1881 · 177 km away
Severe damage ($5–24M)tsunami
- 1982M6.3
Little Nicobar Island
20 Jan 1982 · 251 km away · intensity VIII
Moderate damage ($1–5M)
- 2005M7.2
Andaman Islands, Nicobar Islands
24 Jul 2005 · 235 km away
Limited damage (under $1M)
- 1847
Little Nicobar Island
31 Oct 1847 · 209 km away · intensity X
Limited damage (under $1M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.