Reviewed by USGSIndonesia15y ago
M4.0 earthquake 288 km SSW of Kawalu, Indonesia
Wednesday, April 6, 2011, 20:16:50 UTC · 9.902°S, 107.549°E
A magnitude 4.0 earthquake struck 288 km SSW of Kawalu, Indonesia on Wednesday, April 6, 2011, 20:16:50 UTC, at a depth of 10.0 km (shallow).
- Magnitude
- 4.0
- 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
15 tons of TNT
That is about 1/998 of the Hiroshima bomb. A magnitude 5.0 releases about 32 times more energy.
Tectonic setting
5 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 6 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.7 on April 6, 2011. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 4.6south of Java, Indonesia15y ago · 26 km S of this epicenter
- 4.2290 km SSW of Singaparna, Indonesia15y ago · 22 km W of this epicenter
- 4.5276 km SSW of Kawalu, Indonesia15y ago · 19 km NW of this epicenter
- 4.3south of Java, Indonesia15y ago · 24 km S of this epicenter
- 4.2288 km S of Kawalu, Indonesia15y ago · 40 km E of this epicenter
- 4.7south of Java, Indonesia15y ago · 40 km SE of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 273 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.7226 km SSW of Singaparna, IndonesiaJuly 17, 2006 · 70 km N of this epicenter
- 7.487 km SSW of Srandakan, IndonesiaJuly 23, 1943 · 289 km NE of this epicenter
- 7.066 km SSW of Banjar, IndonesiaSeptember 2, 2009 · 237 km N of this epicenter
- 6.9south of Java, IndonesiaJuly 24, 1979 · 140 km S of this epicenter
- 6.7278 km SSW of Kawalu, IndonesiaApril 3, 2011 · 17 km E of this epicenter
- 6.5260 km SSW of Kroya, IndonesiaSeptember 7, 1974 · 89 km E of this epicenter
- 6.3136 km S of Kawalu, IndonesiaSeptember 14, 1944 · 154 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 10 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 1,128 recorded deaths. The most severe:
- 2006M7.7
Java
17 Jul 2006 · 70 km away
802 deaths$55 million damagetsunami
- 1943M8.1
Java: Jogyakarta
23 Jul 1943 · 272 km away · intensity VIII
213 deathsSevere damage ($5–24M)
- 2009M7.0
Java
2 Sep 2009 · 237 km away
81 deathsSevere damage ($5–24M)tsunami
- 1979M6.1
Java
2 Nov 1979 · 261 km away
30 deaths$16 million damage
- 1937M7.2
Java: Jogyakarta: Klumpit,Prambanan
27 Sep 1937 · 296 km away · intensity IX
1 deathSevere damage ($5–24M)
- 2010M5.1
Java: Garut
10 Jan 2010 · 225 km away
1 death
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.