Reviewed by USGS7y ago
M4.2 earthquake in Banda Sea
Tuesday, July 23, 2019, 21:36:44 UTC · 6.325°S, 130.037°E
A magnitude 4.2 earthquake struck in Banda Sea on Tuesday, July 23, 2019, 21:36:44 UTC, at a depth of 157.4 km (intermediate).
- Magnitude
- 4.2
- Light · mb
- Depth
- 157 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
30 tons of TNT
That is about 1/500 of the Hiroshima bomb. A magnitude 5.0 releases about 16 times more energy.
Tectonic setting
28 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
157 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 4 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.6 on July 27, 2019. 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 1,471 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.51938 Banda Sea EarthquakeFebruary 1, 1938 · 225 km NE of this epicenter
- 8.11963 Banda Sea EarthquakeNovember 4, 1963 · 85 km SW of this epicenter
- 7.7Banda SeaNovember 2, 1950 · 109 km SW of this epicenter
- 7.6196 km S of Ambon, IndonesiaJanuary 27, 2006 · 231 km NW of this epicenter
- 7.5273 km WSW of Tual, IndonesiaJune 3, 1927 · 76 km SE of this epicenter
- 7.3145 km NNE of Lospalos, Timor LesteAugust 30, 1917 · 290 km SW of this epicenter
- 7.3281 km WSW of Tual, IndonesiaDecember 20, 1992 · 49 km SE of this epicenter
- 7.3172 km NE of Lospalos, Timor LesteNovember 24, 1983 · 243 km SW 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 69 recorded deaths. The most severe:
- 1852M8.3
Maluku: Bandanaira
25 Nov 1852 · 124 km away · intensity IX
60 deathsSevere damage ($5–24M)tsunami
- 1763
Bandaneira
12 Sep 1763 · 36 km away · intensity X
7 deathsModerate damage ($1–5M)tsunami
- 1711M7.0
Banda Sea
5 Sep 1711 · 283 km away
2 deathsLimited damage (under $1M)tsunami
- 1710
Bandaneira
6 Mar 1710 · 200 km away · intensity IX
Severe damage ($5–24M)tsunami
- 1938M8.6
New Guinea
1 Feb 1938 · 225 km away · intensity VI
Moderate damage ($1–5M)tsunami
- 1975M5.9
Maluku: Bandanaira
15 Jan 1975 · 147 km away · intensity VII
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.