Reviewed by USGSIndonesia21y ago
M4.7 earthquake 266 km NNW of Sabang, Indonesia
Monday, March 21, 2005, 22:46:00 UTC · 8.164°N, 94.515°E
A magnitude 4.7 earthquake struck 266 km NNW of Sabang, Indonesia on Monday, March 21, 2005, 22:46:00 UTC, at a depth of 30.0 km (shallow). It is the strongest earthquake within 300 km since an M4.9 on March 14, 2005.
- Magnitude
- 4.7
- Light · mb
- Depth
- 30 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
169 tons of TNT
That is about 1/89 of the Hiroshima bomb. A magnitude 5.0 releases about 3 times more energy.
Tectonic setting
2 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
30 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 483 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 · 221 km SW of this epicenter
- 7.0190 km WNW of Sabang, IndonesiaMay 17, 1955 · 165 km SW of this epicenter
- 6.968 km WSW of Sabang, IndonesiaApril 4, 1983 · 272 km S of this epicenter
- 6.8238 km WNW of Sabang, IndonesiaJanuary 20, 1917 · 170 km SW of this epicenter
- 6.63 km ESE of Sabang, IndonesiaJanuary 30, 1942 · 270 km S of this epicenter
- 6.6Nicobar Islands, India regionDecember 26, 2004 · 248 km W of this epicenter
- 6.6249 km NW of Sabang, IndonesiaMarch 5, 1921 · 129 km SW of this epicenter
- 6.5253 km WNW of Sabang, IndonesiaNovember 21, 1907 · 237 km SW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 11 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 9 recorded deaths. The most severe:
- 1936M7.3
Banda Aceh,Lhok Sukon,Lhoksemawe
23 Aug 1936 · 230 km away · intensity VIII
9 deathsModerate damage ($1–5M)tsunami
- 1881M7.9
Andaman I,Nicobar I
31 Dec 1881 · 233 km away
Severe damage ($5–24M)tsunami
- 1964M7.0
Banda Aceh
2 Apr 1964 · 284 km away · intensity VII
Severe damage ($5–24M)tsunami
- 1983M6.6
Sumatera: Banda Aceh
4 Apr 1983 · 272 km away · intensity VII
$1 million damage
- 1982M6.3
Little Nicobar Island
20 Jan 1982 · 147 km away · intensity VIII
Moderate damage ($1–5M)
- 2005M7.2
Andaman Islands, Nicobar Islands
24 Jul 2005 · 257 km away
Limited damage (under $1M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.