QuakeScout
Magnitude6.6

Reviewed by USGSIndonesia80y ago

M6.6 earthquake 54 km NNE of Ternate, Indonesia

Thursday, September 25, 1947, 23:31:10 UTC · 1.260°N, 127.530°E

A magnitude 6.6 earthquake struck 54 km NNE of Ternate, Indonesia on Thursday, September 25, 1947, 23:31:10 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M7.1 on June 12, 1947.

Magnitude
6.6
Strong · mw
Depth
15 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 earthquake

In context

How big was it, and why here?

Energy released

138 kilotons of TNT

That is about 9 times the Hiroshima bomb. It released about 288 times the energy of a magnitude 5.0.

Tectonic setting

108 km

from the nearest mapped plate boundary, between the Sunda and Birds Head plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.

Depth: shallow

15 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 100 km

USGS has not published any M2.5+ earthquake within 100 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 59 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.7148 km SE of Tondano, IndonesiaMay 14, 1932 · 207 km SW of this epicenter
  2. 7.564 km NNW of Ternate, IndonesiaJune 25, 1907 · 40 km W of this epicenter
  3. 7.3108 km SE of Tondano, IndonesiaMay 5, 1908 · 242 km W of this epicenter
  4. 7.2182 km WNW of Tobelo, IndonesiaOctober 10, 1938 · 170 km NW of this epicenter
  5. 7.1129 km WNW of Ternate, IndonesiaMay 3, 1925 · 136 km W of this epicenter
  6. 7.1128 km ESE of Laikit, Laikit II (Dimembe), IndonesiaJune 12, 1947 · 162 km W of this epicenter
  7. 7.0121 km ESE of Labuha, IndonesiaMay 1, 1904 · 281 km S of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 16 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 159 recorded deaths. The most severe:

  1. 1845M7.0

    N Sulawesi: Menado, Tikala, Tomohon

    8 Feb 1845 · 299 km away · intensity IX

    118 deathsModerate damage ($1–5M)tsunami

  2. 1855

    Maluku: Ternate Island

    14 Jul 1855 · 57 km away · intensity IX

    34 deathsModerate damage ($1–5M)

  3. 1932M7.7

    Sulawesi: Kakas,Langowan,Poso,Tondano

    14 May 1932 · 207 km away · intensity VII

    7 deathsSevere damage ($5–24M)tsunami

  4. 1858M7.3

    N. Moluccas Islands

    13 Dec 1858 · 173 km away

    Severe damage ($5–24M)tsunami

  5. 1889M8.0

    N. Moluccas Islands

    6 Sep 1889 · 145 km away

    Moderate damage ($1–5M)tsunami

  6. 1859M7.3

    Sulawesi

    29 Jul 1859 · 265 km away

    Moderate damage ($1–5M)tsunami

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

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