Reviewed by USGSIndonesia44y ago
M5.9 earthquake 64 km W of Sabang, Indonesia
Monday, April 4, 1983, 03:03:34 UTC · 5.791°N, 94.746°E
A magnitude 5.9 earthquake struck 64 km W of Sabang, Indonesia on Monday, April 4, 1983, 03:03:34 UTC, at a depth of 69.5 km (shallow). It is the strongest earthquake within 300 km since an M6.9 on April 4, 1983.
- Magnitude
- 5.9
- Moderate · mb
- Depth
- 70 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- V
- Moderate (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeDashed circle: 75 km aftershock search areaColoured lines: estimated shaking intensity (USGS ShakeMap)
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 22 times the energy of a magnitude 5.0.
Tectonic setting
52 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
70 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 lists 4 M2.5+ earthquakes within 75 km in the following 30 days; the largest was M5.0 on April 4, 1983. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 115 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.0190 km WNW of Sabang, IndonesiaMay 17, 1955 · 151 km NW of this epicenter
- 7.040 km NE of Meulaboh, IndonesiaAugust 3, 1935 · 242 km SE of this epicenter
- 6.975 km WSW of Banda Aceh, IndonesiaAugust 23, 1936 · 59 km S of this epicenter
- 6.95 km W of Banda Aceh, IndonesiaApril 2, 1964 · 65 km SE of this epicenter
- 6.968 km WSW of Sabang, IndonesiaApril 4, 1983 · 8 km S of this epicenter
- 6.8238 km WNW of Sabang, IndonesiaJanuary 20, 1917 · 196 km NW of this epicenter
- 6.7171 km W of Meulaboh, IndonesiaDecember 9, 1929 · 185 km S of this epicenter
- 6.77 km SSE of Reuleuet, IndonesiaApril 12, 1967 · 186 km E of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 18 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 23 recorded deaths. The most severe:
- 1967M6.1
N Sumatera,Malay Peninsula
12 Apr 1967 · 284 km away
14 deathsSevere damage ($5–24M)tsunami
- 1936M7.3
Banda Aceh,Lhok Sukon,Lhoksemawe
23 Aug 1936 · 35 km away · intensity VIII
9 deathsModerate damage ($1–5M)tsunami
- 1964M7.0
Banda Aceh
2 Apr 1964 · 106 km away · intensity VII
Severe damage ($5–24M)tsunami
- 1837M7.3
Banda Atjeh
29 Sep 1837 · 142 km away
Moderate damage ($1–5M)tsunami
- 1983M6.6
Sumatera: Banda Aceh
4 Apr 1983 · 8 km away · intensity VII
$1 million damage
- 1982M6.3
Little Nicobar Island
20 Jan 1982 · 152 km away · intensity VIII
Moderate damage ($1–5M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.