M4.7 earthquake 177 km WSW of Sungai Penuh, Indonesia

Tuesday, February 26, 2008, 05:29:13 UTC · 2.690°S, 99.926°E

A magnitude 4.7 earthquake struck 177 km WSW of Sungai Penuh, Indonesia on Tuesday, February 26, 2008, 05:29:13 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M6.7 on February 25, 2008.

Magnitude: 4.7; Light · mb
Depth: 35 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

169 tons of TNT

That is about 1/89 of the Hiroshima bomb. A magnitude 5.0 releases about 3 times more energy.

Tectonic setting

8 km

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

Depth: shallow

35 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 6 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.9 on February 27, 2008. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 445 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 19 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 201 recorded deaths. The most severe:

1995M6.8
Sumatera, Jambi Province
6 Oct 1995 · 182 km away
84 deathsExtreme damage ($25M+)
2007M6.4
Sumatra: Southern
6 Mar 2007 · 252 km away · intensity VIII
67 deathsSevere damage ($5–24M)
2007M8.4
Sumatra
12 Sep 2007 · 252 km away
25 deathsSevere damage ($5–24M)tsunami
1914M7.6
Sumatera
25 Jun 1914 · 251 km away
20 deathsLimited damage (under $1M)tsunami
2004M5.1
Sumatra: Padangpanjang
16 Feb 2004 · 260 km away
5 deathsLimited damage (under $1M)
1909M7.6
Sw Sumatra: Kerintji, Redjanglebong
3 Jun 1909 · 142 km away
Severe damage ($5–24M)tsunami

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

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