Reviewed by USGSIndonesia15y ago
M4.7 earthquake south of Java, Indonesia
Wednesday, April 6, 2011, 22:26:03 UTC · 10.185°S, 107.768°E
A magnitude 4.7 earthquake struck south of Java, Indonesia on Wednesday, April 6, 2011, 22:26:03 UTC, at a depth of 10.0 km (shallow). It is the strongest earthquake within 300 km since an M4.7 on April 4, 2011.
- Magnitude
- 4.7
- 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
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
17 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 3 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.6 on April 25, 2011. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 249 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 · 107 km N of this epicenter
- 7.487 km SSW of Srandakan, IndonesiaJuly 23, 1943 · 286 km NE of this epicenter
- 7.066 km SSW of Banjar, IndonesiaSeptember 2, 2009 · 272 km N of this epicenter
- 6.9south of Java, IndonesiaJuly 24, 1979 · 107 km S of this epicenter
- 6.7278 km SSW of Kawalu, IndonesiaApril 3, 2011 · 38 km N of this epicenter
- 6.5260 km SSW of Kroya, IndonesiaSeptember 7, 1974 · 76 km NE of this epicenter
- 6.3136 km S of Kawalu, IndonesiaSeptember 14, 1944 · 178 km N of this epicenter
- 6.3south of Java, IndonesiaMarch 21, 1940 · 7 km SW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 8 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 · 107 km away
802 deaths$55 million damagetsunami
- 1943M8.1
Java: Jogyakarta
23 Jul 1943 · 256 km away · intensity VIII
213 deathsSevere damage ($5–24M)
- 2009M7.0
Java
2 Sep 2009 · 272 km away
81 deathsSevere damage ($5–24M)tsunami
- 1979M6.1
Java
2 Nov 1979 · 286 km away
30 deaths$16 million damage
- 1937M7.2
Java: Jogyakarta: Klumpit,Prambanan
27 Sep 1937 · 280 km away · intensity IX
1 deathSevere damage ($5–24M)
- 2010M5.1
Java: Garut
10 Jan 2010 · 254 km away
1 death
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.