QuakeScout
Magnitude4.4

Reviewed by USGSIndonesia20y ago

M4.4 earthquake 197 km SSW of Kroya, Indonesia

Saturday, September 23, 2006, 04:29:27 UTC · 9.347°S, 108.755°E

A magnitude 4.4 earthquake struck 197 km SSW of Kroya, Indonesia on Saturday, September 23, 2006, 04:29:27 UTC, at a depth of 10.0 km (shallow).

Magnitude
4.4
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

60 tons of TNT

That is about 1/251 of the Hiroshima bomb. A magnitude 5.0 releases about 8 times more energy.

Tectonic setting

99 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 M4.5 on October 12, 2006. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

M3M41h6h1d3d7d14d30dMainshock M4.4
Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.
  1. 4.5223 km SSW of Kroya, Indonesia20y ago · 27 km SW of this epicenter

Regional history

Past M5+ earthquakes within 300 km

USGS lists 301 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 · 147 km W of this epicenter
  2. 7.6233 km S of Pundong, IndonesiaSeptember 11, 1921 · 222 km E of this epicenter
  3. 7.487 km SSW of Srandakan, IndonesiaJuly 23, 1943 · 144 km NE of this epicenter
  4. 7.1138 km SSE of Pundong, IndonesiaSeptember 10, 1926 · 207 km E of this epicenter
  5. 6.9south of Java, IndonesiaJuly 24, 1979 · 231 km SW of this epicenter
  6. 6.992 km S of Pundong, IndonesiaSeptember 27, 1937 · 194 km E of this epicenter
  7. 6.5260 km SSW of Kroya, IndonesiaSeptember 7, 1974 · 68 km SW of this epicenter
  8. 6.4244 km SSW of Trenggalek, IndonesiaMay 29, 1955 · 258 km E of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 24 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 8,083 recorded deaths. The most severe:

  1. 2006M6.3

    Java: Bantul, Yogyakarta

    26 May 2006 · 241 km away

    6,234 deaths$3.1 billion damage

  2. 2006M7.7

    Java

    17 Jul 2006 · 147 km away

    802 deaths$55 million damagetsunami

  3. 1924

    Java: Wonosobo

    2 Dec 1924 · 260 km away · intensity IX

    727 deathsSevere damage ($5–24M)

  4. 1943M8.1

    Java: Jogyakarta

    23 Jul 1943 · 138 km away · intensity VIII

    213 deathsSevere damage ($5–24M)

  5. 1924

    Java

    12 Nov 1924 · 255 km away

    60 deaths

  6. 1979M6.1

    Java

    2 Nov 1979 · 196 km away

    30 deaths$16 million damage

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

Nearby trackers

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