QuakeScout
Magnitude4.6

Reviewed by USGSIndonesia20y ago

M4.6 earthquake 271 km SSW of Kroya, Indonesia

Sunday, September 17, 2006, 05:40:04 UTC · 10.042°S, 108.762°E

A magnitude 4.6 earthquake struck 271 km SSW of Kroya, Indonesia on Sunday, September 17, 2006, 05:40:04 UTC, at a depth of 10.0 km (shallow). It is the strongest earthquake within 300 km since an M4.7 on September 16, 2006.

Magnitude
4.6
Light · mb
Depth
10 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

120 tons of TNT

That is about 1/126 of the Hiroshima bomb. A magnitude 5.0 releases about 4 times more energy.

Tectonic setting

24 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

10 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 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M4.1 on September 24, 2006. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

M3M41h6h1d3d7d14d30dMainshock M4.6
Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.
  1. 4.1249 km SSW of Kroya, Indonesia20y ago · 25 km N of this epicenter

Regional history

Past M5+ earthquakes within 300 km

USGS lists 238 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.7226 km SSW of Singaparna, IndonesiaJuly 17, 2006 · 170 km NW of this epicenter
  2. 7.6233 km S of Pundong, IndonesiaSeptember 11, 1921 · 207 km E of this epicenter
  3. 7.487 km SSW of Srandakan, IndonesiaJuly 23, 1943 · 198 km NE of this epicenter
  4. 7.1138 km SSE of Pundong, IndonesiaSeptember 10, 1926 · 227 km NE of this epicenter
  5. 6.9south of Java, IndonesiaJuly 24, 1979 · 169 km SW of this epicenter
  6. 6.992 km S of Pundong, IndonesiaSeptember 27, 1937 · 230 km NE of this epicenter
  7. 6.5260 km SSW of Kroya, IndonesiaSeptember 7, 1974 · 51 km NW of this epicenter
  8. 6.5south of Java, IndonesiaDecember 12, 1924 · 256 km SE of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 13 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 7,282 recorded deaths. The most severe:

  1. 2006M6.3

    Java: Bantul, Yogyakarta

    26 May 2006 · 296 km away

    6,234 deaths$3.1 billion damage

  2. 2006M7.7

    Java

    17 Jul 2006 · 170 km away

    802 deaths$55 million damagetsunami

  3. 1943M8.1

    Java: Jogyakarta

    23 Jul 1943 · 148 km away · intensity VIII

    213 deathsSevere damage ($5–24M)

  4. 1979M6.1

    Java

    2 Nov 1979 · 271 km away

    30 deaths$16 million damage

  5. 1859

    S. Java Sea

    20 Oct 1859 · 271 km away

    2 deathsLimited damage (under $1M)tsunami

  6. 1937M7.2

    Java: Jogyakarta: Klumpit,Prambanan

    27 Sep 1937 · 173 km away · intensity IX

    1 deathSevere damage ($5–24M)

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

Nearby trackers

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