Reviewed by USGSIndonesia21y ago
M4.3 earthquake 285 km NW of Sabang, Indonesia
Thursday, June 23, 2005, 11:06:17 UTC · 7.945°N, 93.755°E
A magnitude 4.3 earthquake struck 285 km NW of Sabang, Indonesia on Thursday, June 23, 2005, 11:06:17 UTC, at a depth of 35.0 km (shallow).
- Magnitude
- 4.3
- Light · mb
- 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 earthquakeDashed circle: 50 km aftershock search area
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
84 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
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 50 km
USGS lists 7 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.8 on July 5, 2005. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 4.2Nicobar Islands, India region21y ago · 45 km NW of this epicenter
- 4.5258 km NNW of Sabang, Indonesia21y ago · 41 km E of this epicenter
- 4.5261 km NNW of Sabang, Indonesia21y ago · 33 km E of this epicenter
- 4.8255 km NW of Sabang, Indonesia21y ago · 36 km S of this epicenter
- 4.5247 km NW of Sabang, Indonesia21y ago · 39 km SE of this epicenter
- 4.5279 km NNW of Sabang, Indonesia21y ago · 37 km NE of this epicenter
- 4.3238 km NW of Sabang, Indonesia21y ago · 48 km SE of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 517 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 · 145 km SW of this epicenter
- 7.0190 km WNW of Sabang, IndonesiaMay 17, 1955 · 125 km S of this epicenter
- 6.968 km WSW of Sabang, IndonesiaApril 4, 1983 · 269 km SE of this epicenter
- 6.8238 km WNW of Sabang, IndonesiaJanuary 20, 1917 · 107 km S of this epicenter
- 6.63 km ESE of Sabang, IndonesiaJanuary 30, 1942 · 289 km SE of this epicenter
- 6.6Nicobar Islands, India regionApril 7, 1973 · 283 km W of this epicenter
- 6.6Nicobar Islands, India regionDecember 26, 2004 · 184 km NW of this epicenter
- 6.6249 km NW of Sabang, IndonesiaMarch 5, 1921 · 62 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 10 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 · 159 km away
Severe damage ($5–24M)tsunami
- 1983M6.6
Sumatera: Banda Aceh
4 Apr 1983 · 269 km away · intensity VII
$1 million damage
- 1982M6.3
Little Nicobar Island
20 Jan 1982 · 114 km away · intensity VIII
Moderate damage ($1–5M)
- 2005M7.2
Andaman Islands, Nicobar Islands
24 Jul 2005 · 172 km away
Limited damage (under $1M)
- 1847
Little Nicobar Island
31 Oct 1847 · 69 km away · intensity X
Limited damage (under $1M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.