QuakeScout
Magnitude4.2

Reviewed by USGSIndonesia17y ago

M4.2 earthquake 67 km S of Banjar, Indonesia

Friday, October 2, 2009, 09:00:37 UTC · 7.800°S, 107.328°E

A magnitude 4.2 earthquake struck 67 km S of Banjar, Indonesia on Friday, October 2, 2009, 09:00:37 UTC, at a depth of 13.4 km (shallow).

Magnitude
4.2
Light · mb
Depth
13 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

30 tons of TNT

That is about 1/500 of the Hiroshima bomb. A magnitude 5.0 releases about 16 times more energy.

Tectonic setting

205 km

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

Depth: shallow

13 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 3 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.7 on October 12, 2009. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

M3M4M51h6h1d3d7d14d30dMainshock M4.2
Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.
  1. 4.797 km S of Banjar, Indonesia17y ago · 30 km S of this epicenter
  2. 4.463 km SSW of Banjar, Indonesia17y ago · 5 km NW of this epicenter
  3. 4.770 km SSW of Banjar, Indonesia17y ago · 4 km SW of this epicenter

Regional history

Past M5+ earthquakes within 300 km

USGS lists 431 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 · 165 km S of this epicenter
  2. 7.535 km NNE of Rengasdengklok, IndonesiaAugust 8, 2007 · 216 km N of this epicenter
  3. 7.487 km SSW of Srandakan, IndonesiaJuly 23, 1943 · 291 km E of this epicenter
  4. 7.066 km SSW of Banjar, IndonesiaSeptember 2, 2009 · 4 km NW of this epicenter
  5. 7.030 km WNW of Labuan, IndonesiaApril 1, 1943 · 256 km NW of this epicenter
  6. 6.850 km WSW of Labuan, IndonesiaJuly 3, 1954 · 245 km NW of this epicenter
  7. 6.829 km SW of Labuan, IndonesiaOctober 25, 2000 · 233 km NW of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 32 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 1,715 recorded deaths. The most severe:

  1. 2006M7.7

    Java

    17 Jul 2006 · 165 km away

    802 deaths$55 million damagetsunami

  2. 1924

    Java: Wonosobo

    2 Dec 1924 · 289 km away · intensity IX

    727 deathsSevere damage ($5–24M)

  3. 2009M7.0

    Java

    2 Sep 2009 · 4 km away

    81 deathsSevere damage ($5–24M)tsunami

  4. 1924

    Java

    12 Nov 1924 · 278 km away

    60 deaths

  5. 1979M6.1

    Java

    2 Nov 1979 · 103 km away

    30 deaths$16 million damage

  6. 1875

    W Java: Kuningan

    25 Oct 1875 · 147 km away · intensity VIII

    7 deathsSevere damage ($5–24M)

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

Nearby trackers

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