Reviewed by USGSIndonesia39y ago
M5.2 earthquake 168 km NW of Ternate, Indonesia
Sunday, July 12, 1987, 20:29:06 UTC · 2.043°N, 126.521°E
A magnitude 5.2 earthquake struck 168 km NW of Ternate, Indonesia on Sunday, July 12, 1987, 20:29:06 UTC, at a depth of 77.3 km (intermediate). It is the strongest earthquake within 300 km since an M5.2 on July 12, 1987.
- Magnitude
- 5.2
- Moderate · mb
- Depth
- 77 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: 75 km aftershock search area
In context
How big was it, and why here?
Energy released
951 tons of TNT
That is about 1/16 of the Hiroshima bomb. It released about 2 times the energy of a magnitude 5.0.
Tectonic setting
13 km
from the nearest mapped plate boundary, between the Birds Head and Sunda plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: intermediate
77 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 75 km
USGS lists 1 M2.5+ earthquake within 75 km in the following 30 days; the largest was M4.4 on August 9, 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 914 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.8161 km SE of Sarangani, PhilippinesApril 1, 1936 · 247 km N of this epicenter
- 7.790 km NE of Tobelo, IndonesiaSeptember 8, 1966 · 222 km E of this epicenter
- 7.7148 km SE of Tondano, IndonesiaMay 14, 1932 · 197 km S of this epicenter
- 7.7121 km E of Bitung, IndonesiaAugust 10, 1968 · 71 km SW of this epicenter
- 7.6101 km SE of Sarangani, PhilippinesDecember 16, 1910 · 297 km N of this epicenter
- 7.564 km NNW of Ternate, IndonesiaJune 25, 1907 · 107 km SE of this epicenter
- 7.5146 km NW of Ternate, IndonesiaAugust 14, 1986 · 28 km S of this epicenter
- 7.5210 km SSE of Sarangani, PhilippinesAugust 17, 1912 · 180 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 21 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 2,965 recorded deaths. The most severe:
- 1856
Sangihe Pulau (Volcanic)
2 Mar 1856 · 214 km away
2,806 deathsSevere damage ($5–24M)tsunami
- 1845M7.0
N Sulawesi: Menado, Tikala, Tomohon
8 Feb 1845 · 196 km away · intensity IX
118 deathsModerate damage ($1–5M)tsunami
- 1855
Maluku: Ternate Island
14 Jul 1855 · 163 km away · intensity IX
34 deathsModerate damage ($1–5M)
- 1932M7.7
Sulawesi: Kakas,Langowan,Poso,Tondano
14 May 1932 · 197 km away · intensity VII
7 deathsSevere damage ($5–24M)tsunami
- 1858M7.3
N. Moluccas Islands
13 Dec 1858 · 130 km away
Severe damage ($5–24M)tsunami
- 1889M8.0
N. Moluccas Islands
6 Sep 1889 · 120 km away
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.