Reviewed by USGSTimor Leste3y ago
M4.5 earthquake 182 km NNE of Lospalos, Timor Leste
Saturday, March 18, 2023, 13:59:10 UTC · 7.020°S, 127.694°E
A magnitude 4.5 earthquake struck 182 km NNE of Lospalos, Timor Leste on Saturday, March 18, 2023, 13:59:10 UTC, at a depth of 10.0 km (shallow). It is the strongest earthquake within 300 km since an M4.6 on March 13, 2023.
- Magnitude
- 4.5
- Light · mb
- Depth
- 10 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
85 tons of TNT
That is about 1/178 of the Hiroshima bomb. A magnitude 5.0 releases about 6 times more energy.
Tectonic setting
4 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: shallow
10 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 2 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.4 on April 8, 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 1,235 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 · 211 km E of this epicenter
- 7.7Banda SeaNovember 2, 1950 · 166 km E of this epicenter
- 7.6Pulau Pulau Tanimbar, IndonesiaJanuary 9, 2023 · 256 km E of this epicenter
- 7.6196 km S of Ambon, IndonesiaJanuary 27, 2006 · 179 km N of this epicenter
- 7.3145 km NNE of Lospalos, Timor LesteAugust 30, 1917 · 39 km S of this epicenter
- 7.3125 km NNE of Lospalos, Timor LesteDecember 29, 2021 · 60 km S of this epicenter
- 7.3172 km NE of Lospalos, Timor LesteNovember 24, 1983 · 73 km SE of this epicenter
- 7.3Banda SeaJune 24, 2019 · 177 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 7 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 8 recorded deaths. The most severe:
- 1763
Bandaneira
12 Sep 1763 · 279 km away · intensity X
7 deathsModerate damage ($1–5M)tsunami
- 2023M7.6
Banda Sea
9 Jan 2023 · 259 km away · intensity V
1 deathModerate damage ($1–5M)tsunami
- 1963M8.3
Banda Sea
4 Nov 1963 · 209 km away
Limited damage (under $1M)
- 1918M8.1
Banda Sea
18 Nov 1918 · 144 km away
- 1950M8.1
Banda Sea
2 Nov 1950 · 208 km away
- 1917M7.8
Banda Sea
30 Aug 1917 · 63 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.