M4.1 earthquake 278 km ENE of Lospalos, Timor Leste

Saturday, April 18, 2020, 17:51:10 UTC · 7.329°S, 129.224°E

A magnitude 4.1 earthquake struck 278 km ENE of Lospalos, Timor Leste on Saturday, April 18, 2020, 17:51:10 UTC, at a depth of 150.6 km (intermediate).

Magnitude: 4.1; Light · mb
Depth: 151 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

21 tons of TNT

That is about 1/707 of the Hiroshima bomb. A magnitude 5.0 releases about 22 times more energy.

Tectonic setting

98 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

151 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 6 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.1 on May 9, 2020. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 1,418 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 13 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 67 recorded deaths. The most severe:

1852M8.3
Maluku: Bandanaira
25 Nov 1852 · 238 km away · intensity IX
60 deathsSevere damage ($5–24M)tsunami
1763
Bandaneira
12 Sep 1763 · 171 km away · intensity X
7 deathsModerate damage ($1–5M)tsunami
1975M5.9
Maluku: Bandanaira
15 Jan 1975 · 273 km away · intensity VII
Moderate damage ($1–5M)tsunami
1963M8.3
Banda Sea
4 Nov 1963 · 65 km away
Limited damage (under $1M)
1852M7.0
Bandaneira
24 Dec 1852 · 295 km away
Limited damage (under $1M)tsunami
1908M6.6
Timor
23 Mar 1908 · 298 km away
Limited damage (under $1M)tsunami

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

Nearby trackers