Reviewed by USGSTimor Leste39y ago
M4.3 earthquake 293 km ENE of Lospalos, Timor Leste
Sunday, August 30, 1987, 19:22:35 UTC · 7.362°S, 129.390°E
A magnitude 4.3 earthquake struck 293 km ENE of Lospalos, Timor Leste on Sunday, August 30, 1987, 19:22:35 UTC, at a depth of 284.3 km (intermediate).
- Magnitude
- 4.3
- Light · mb
- Depth
- 284 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
43 tons of TNT
That is about 1/354 of the Hiroshima bomb. A magnitude 5.0 releases about 11 times more energy.
Tectonic setting
103 km
from the nearest mapped plate boundary, between the Banda Sea and Timor plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: intermediate
284 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 M4.6 on September 26, 1987. 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 574 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 · 51 km NE of this epicenter
- 7.7Banda SeaNovember 2, 1950 · 64 km N of this epicenter
- 7.5273 km WSW of Tual, IndonesiaJune 3, 1927 · 145 km NE of this epicenter
- 7.3145 km NNE of Lospalos, Timor LesteAugust 30, 1917 · 195 km W of this epicenter
- 7.3172 km NE of Lospalos, Timor LesteNovember 24, 1983 · 135 km W of this epicenter
- 7.258 km ENE of Lospalos, Timor LesteSeptember 29, 1905 · 235 km SW of this epicenter
- 7.1196 km SSE of Ambon, IndonesiaJuly 4, 1914 · 243 km N of this epicenter
- 7.1186 km NE of Lospalos, Timor LesteMay 15, 1962 · 129 km W of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 12 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 · 166 km away · intensity X
7 deathsModerate damage ($1–5M)tsunami
- 1975M5.9
Maluku: Bandanaira
15 Jan 1975 · 271 km away · intensity VII
Moderate damage ($1–5M)tsunami
- 1963M8.3
Banda Sea
4 Nov 1963 · 60 km away
Limited damage (under $1M)
- 1852M7.0
Bandaneira
24 Dec 1852 · 290 km away
Limited damage (under $1M)tsunami
- 1908M6.6
Timor
23 Mar 1908 · 296 km away
Limited damage (under $1M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.