Reviewed by USGSIndonesia40y ago
M4.8 earthquake 109 km W of Ternate, Indonesia
Wednesday, February 18, 1987, 14:22:54 UTC · 0.976°N, 126.418°E
A magnitude 4.8 earthquake struck 109 km W of Ternate, Indonesia on Wednesday, February 18, 1987, 14:22:54 UTC, at a depth of 33.0 km (shallow). It is the strongest earthquake within 300 km since an M5.0 on February 16, 1987.
- Magnitude
- 4.8
- Light · mb
- Depth
- 33 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
239 tons of TNT
That is about 1/63 of the Hiroshima bomb. A magnitude 5.0 releases about 2 times more energy.
Tectonic setting
30 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
33 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 5 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.1 on February 23, 1987. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 5.0129 km W of Ternate, Indonesia40y ago · 38 km SW of this epicenter
- 4.8118 km WSW of Ternate, Indonesia40y ago · 49 km S of this epicenter
- 4.5116 km WSW of Ternate, Indonesia40y ago · 46 km S of this epicenter
- 4.2143 km W of Ternate, Indonesia40y ago · 42 km SW of this epicenter
- 5.1114 km W of Ternate, Indonesia40y ago · 18 km SW of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 832 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.790 km NE of Tobelo, IndonesiaSeptember 8, 1966 · 279 km NE of this epicenter
- 7.7148 km SE of Tondano, IndonesiaMay 14, 1932 · 88 km SW of this epicenter
- 7.7121 km E of Bitung, IndonesiaAugust 10, 1968 · 60 km N of this epicenter
- 7.564 km NNW of Ternate, IndonesiaJune 25, 1907 · 94 km NE of this epicenter
- 7.5146 km NW of Ternate, IndonesiaAugust 14, 1986 · 92 km N of this epicenter
- 7.5210 km SSE of Sarangani, PhilippinesAugust 17, 1912 · 292 km N of this epicenter
- 7.3108 km SE of Tondano, IndonesiaMay 5, 1908 · 116 km SW of this epicenter
- 7.2182 km WNW of Tobelo, IndonesiaOctober 10, 1938 · 159 km N 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 159 recorded deaths. The most severe:
- 1845M7.0
N Sulawesi: Menado, Tikala, Tomohon
8 Feb 1845 · 183 km away · intensity IX
118 deathsModerate damage ($1–5M)tsunami
- 1855
Maluku: Ternate Island
14 Jul 1855 · 100 km away · intensity IX
34 deathsModerate damage ($1–5M)
- 1932M7.7
Sulawesi: Kakas,Langowan,Poso,Tondano
14 May 1932 · 88 km away · intensity VII
7 deathsSevere damage ($5–24M)tsunami
- 1858M7.3
N. Moluccas Islands
13 Dec 1858 · 47 km away
Severe damage ($5–24M)tsunami
- 1889M8.0
N. Moluccas Islands
6 Sep 1889 · 19 km away
Moderate damage ($1–5M)tsunami
- 1859M7.3
Sulawesi
29 Jul 1859 · 148 km away
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.