Reviewed by USGSIndonesia36y ago
M4.2 earthquake 49 km NNE of Gorontalo, Indonesia
Sunday, August 5, 1990, 01:29:38 UTC · 0.958°N, 123.213°E
A magnitude 4.2 earthquake struck 49 km NNE of Gorontalo, Indonesia on Sunday, August 5, 1990, 01:29:38 UTC, at a depth of 68.4 km (shallow).
- Magnitude
- 4.2
- Light · mb
- Depth
- 68 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
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
50 km
from the nearest mapped plate boundary, between the Molucca Sea and Sunda plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
68 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 4 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.1 on August 22, 1990. 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 526 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.11939 Sulawesi EarthquakeDecember 21, 1939 · 118 km SW of this epicenter
- 7.8160 km W of Gorontalo, IndonesiaJanuary 22, 1905 · 181 km W of this epicenter
- 7.875 km NNW of Gorontalo, IndonesiaApril 18, 1990 · 47 km NW of this epicenter
- 7.433 km NW of Gorontalo, IndonesiaNovember 8, 1941 · 49 km SW of this epicenter
- 7.491 km SW of Gorontalo, IndonesiaAugust 6, 1984 · 140 km SW of this epicenter
- 7.3108 km SE of Tondano, IndonesiaMay 5, 1908 · 258 km E of this epicenter
- 7.2295 km SSE of Tabiauan, PhilippinesMarch 29, 1907 · 299 km N of this epicenter
- 7.1156 km NW of Gorontalo, IndonesiaJanuary 11, 1913 · 150 km W 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 123 recorded deaths. The most severe:
- 1845M7.0
N Sulawesi: Menado, Tikala, Tomohon
8 Feb 1845 · 191 km away · intensity IX
118 deathsModerate damage ($1–5M)tsunami
- 1990M7.6
Minahassa Peninsula: Bolaang-Gorontalo
18 Apr 1990 · 47 km away
3 deathsSevere damage ($5–24M)
- 1983M6.1
Central Sulawesi
25 Oct 1983 · 263 km away · intensity VII
2 deathsModerate damage ($1–5M)
- 1939M8.0
Centrtal Sulawesi: Kalo,Luwuk,Sula I
21 Dec 1939 · 109 km away
Moderate damage ($1–5M)tsunami
- 1859M7.3
Sulawesi
29 Jul 1859 · 275 km away
Moderate damage ($1–5M)tsunami
- 1983M6.0
Celebes: Minahassa: Tolitoli
16 Oct 1983 · 241 km away
Moderate damage ($1–5M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.