QuakeScout
Magnitude4.1

Reviewed by USGSIndonesia20y ago

M4.1 earthquake 59 km S of Singkil, Indonesia

Thursday, April 20, 2006, 21:04:09 UTC · 1.751°N, 97.768°E

A magnitude 4.1 earthquake struck 59 km S of Singkil, Indonesia on Thursday, April 20, 2006, 21:04:09 UTC, at a depth of 45.4 km (shallow).

Magnitude
4.1
Light · mb
Depth
45 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

21 tons of TNT

That is about 1/707 of the Hiroshima bomb. A magnitude 5.0 releases about 22 times more energy.

Tectonic setting

114 km

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

Depth: shallow

45 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 has not published any M2.5+ earthquake within 50 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 452 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 9.12004 Sumatra - Andaman Islands EarthquakeDecember 26, 2004 · 262 km NW of this epicenter
  2. 8.678 km WSW of Singkil, IndonesiaMarch 28, 2005 · 82 km NW of this epicenter
  3. 8.2The 1907 Sumatra Earthquake and TsunamiJanuary 4, 1907 · 269 km NW of this epicenter
  4. 7.6212 km W of Pariaman, IndonesiaDecember 28, 1935 · 232 km S of this epicenter
  5. 7.450 km NW of Sinabang, IndonesiaNovember 2, 2002 · 222 km NW of this epicenter
  6. 7.1190 km SSW of Sibolga, IndonesiaNovember 17, 1984 · 175 km S of this epicenter
  7. 7.186 km WSW of Pangkalan Brandan, IndonesiaSeptember 19, 1936 · 216 km N of this epicenter
  8. 7.085 km SSE of Meulaboh, IndonesiaJune 20, 1976 · 244 km NW of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 23 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 232,686 recorded deaths. The most severe:

  1. 2004M9.1

    Sumatra: Aceh: Off West Coast

    26 Dec 2004 · 262 km away

    227,899 deaths$10 billion damagetsunami

  2. 1907M8.2

    Nw Sumatra: Gunungsitoli, Barus

    4 Jan 1907 · 269 km away

    2,188 deathsSevere damage ($5–24M)tsunami

  3. 2005M8.6

    Sumatera: Sw

    28 Mar 2005 · 82 km away

    1,319 deaths$37 million damagetsunami

  4. 1861M7.0

    Sw. Sumatra

    9 Mar 1861 · 195 km away

    950 deathsSevere damage ($5–24M)tsunami

  5. 1797M8.0

    Sw. Sumatra

    10 Feb 1797 · 238 km away · intensity IX

    300 deathsModerate damage ($1–5M)tsunami

  6. 1936

    N Sumatera: Tapanuli, Karo

    9 Sep 1936 · 197 km away · intensity VIII

    17 deathsModerate damage ($1–5M)

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

Nearby trackers

Closest city pages