QuakeScout
Magnitude7.6

Reviewed by USGSIndonesia106y ago

M7.6 earthquake 233 km S of Pundong, Indonesia

Sunday, September 11, 1921, 04:01:45 UTC · 10.046°S, 110.653°E

A magnitude 7.6 earthquake struck 233 km S of Pundong, Indonesia on Sunday, September 11, 1921, 04:01:45 UTC, at a depth of 15.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.

Magnitude
7.6
Major · 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

3.5 megatons of TNT

That is about 235 times the Hiroshima bomb. It released about 7,413 times the energy of a magnitude 5.0.

Tectonic setting

48 km

from the nearest mapped plate boundary, between the Sunda and Australian plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.

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 200 km

USGS has not published any M2.5+ earthquake within 200 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 3 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 6.7169 km S of Boyolangu, IndonesiaJuly 7, 1910 · 119 km NE of this epicenter
  2. 6.668 km S of Sumberpucung, IndonesiaSeptember 11, 1916 · 236 km NE of this epicenter
  3. 6.2166 km SSW of Bambanglipuro, IndonesiaAugust 31, 1918 · 111 km NW of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 5 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 7 recorded deaths. The most severe:

  1. 1867

    Java: Jogyakarta, Surakarta

    10 Jun 1867 · 251 km away · intensity IX

    5 deathsSevere damage ($5–24M)tsunami

  2. 1859

    S. Java Sea

    20 Oct 1859 · 122 km away

    2 deathsLimited damage (under $1M)tsunami

  3. 1916M7.3

    Java

    11 Sep 1916 · 282 km away

    Severe damage ($5–24M)

  4. 1840M7.0

    Java: Purworejo

    4 Jan 1840 · 228 km away · intensity IX

    Severe damage ($5–24M)tsunami

  5. 1921M7.5

    S Of Java

    11 Sep 1921 · 113 km away

    Limited damage (under $1M)tsunami

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

Nearby trackers

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