Reviewed by USGSIndonesia3y ago
M4.0 earthquake in Kepulauan Barat Daya, Indonesia
Wednesday, March 29, 2023, 23:38:38 UTC · 7.320°S, 128.581°E
A magnitude 4.0 earthquake struck in Kepulauan Barat Daya, Indonesia on Wednesday, March 29, 2023, 23:38:38 UTC, at a depth of 148.3 km (intermediate).
- Magnitude
- 4.0
- Light · mb
- Depth
- 148 km
- Intermediate
- 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
15 tons of TNT
That is about 1/998 of the Hiroshima bomb. A magnitude 5.0 releases about 32 times more energy.
Tectonic setting
66 km
from the nearest mapped plate boundary, between the Banda Sea and Timor plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: intermediate
148 km
Intermediate-depth earthquakes usually break inside a plate that is sinking into the mantle. Shaking spreads over a wide area but is gentler at the epicenter than a shallow quake of the same size.
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 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M4.0 on April 13, 2023. 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 1,393 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.11963 Banda Sea EarthquakeNovember 4, 1963 · 120 km E of this epicenter
- 7.7Banda SeaNovember 2, 1950 · 86 km NE of this epicenter
- 7.6Pulau Pulau Tanimbar, IndonesiaJanuary 9, 2023 · 160 km E of this epicenter
- 7.6196 km S of Ambon, IndonesiaJanuary 27, 2006 · 211 km N of this epicenter
- 7.5273 km WSW of Tual, IndonesiaJune 3, 1927 · 227 km E of this epicenter
- 7.3145 km NNE of Lospalos, Timor LesteAugust 30, 1917 · 106 km W of this epicenter
- 7.3125 km NNE of Lospalos, Timor LesteDecember 29, 2021 · 114 km W of this epicenter
- 7.3281 km WSW of Tual, IndonesiaDecember 20, 1992 · 216 km E 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 68 recorded deaths. The most severe:
- 1852M8.3
Maluku: Bandanaira
25 Nov 1852 · 264 km away · intensity IX
60 deathsSevere damage ($5–24M)tsunami
- 1763
Bandaneira
12 Sep 1763 · 215 km away · intensity X
7 deathsModerate damage ($1–5M)tsunami
- 2023M7.6
Banda Sea
9 Jan 2023 · 164 km away · intensity V
1 deathModerate damage ($1–5M)tsunami
- 1963M8.3
Banda Sea
4 Nov 1963 · 122 km away
Limited damage (under $1M)
- 1918M8.1
Banda Sea
18 Nov 1918 · 58 km away
- 1950M8.1
Banda Sea
2 Nov 1950 · 136 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.