Reviewed by USGSChina18y ago
M4.1 earthquake 38 km NNW of Guangyuan, China
Friday, September 26, 2008, 10:32:01 UTC · 32.767°N, 105.678°E
A magnitude 4.1 earthquake struck 38 km NNW of Guangyuan, China on Friday, September 26, 2008, 10:32:01 UTC, at a depth of 10.0 km (shallow).
- Magnitude
- 4.1
- 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 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
364 km
from the nearest mapped plate boundary, between the Eurasian and Yangtze plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
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 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 87 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.958 km W of Tianpeng, ChinaMay 12, 2008 · 297 km SW of this epicenter
- 7.4101 km WNW of Jiangyou, ChinaAugust 25, 1933 · 209 km SW of this epicenter
- 6.9121 km NNW of Jiangyou, ChinaAugust 16, 1976 · 142 km W of this epicenter
- 6.794 km NNW of Jiangyou, ChinaAugust 23, 1976 · 143 km W of this epicenter
- 6.499 km NNW of Jiangyou, ChinaAugust 21, 1976 · 136 km W of this epicenter
- 6.3146 km NW of Jiangyou, ChinaNovember 9, 1960 · 192 km W of this epicenter
- 6.261 km S of Tianshui, ChinaAugust 1, 1936 · 140 km N of this epicenter
- 6.1127 km WNW of Jiangyou, ChinaMarch 14, 1938 · 219 km W of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 31 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 194,768 recorded deaths. The most severe:
- 2008M7.9
Sichuan Province
12 May 2008 · 293 km away · intensity IX
87,652 deaths$86 billion damagetsunami
- 1718M7.5
Gansu Province
19 Jun 1718 · 252 km away · intensity X
73,000 deathsExtreme damage ($25M+)
- 1879M8.0
Gansu Province
1 Jul 1879 · 103 km away · intensity XI
22,000 deathsExtreme damage ($25M+)
- 1933M7.4
Sichuan Province
25 Aug 1933 · 209 km away · intensity X
9,300 deathsExtreme damage ($25M+)
- 1765M6.5
Gansu Province: Wushan, Gangu
2 Sep 1765 · 235 km away · intensity IX
2,068 deathsExtreme damage ($25M+)
- 1881M6.5
Gansu Province
20 Jul 1881 · 137 km away · intensity VIII
480 deathsSevere damage ($5–24M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.