Reviewed by USGSIndonesia101y ago
M6.6 earthquake 50 km S of Pekanbaru, Indonesia
Monday, June 28, 1926, 03:23:27 UTC · 0.059°N, 101.419°E
A magnitude 6.6 earthquake struck 50 km S of Pekanbaru, Indonesia on Monday, June 28, 1926, 03:23:27 UTC, at a depth of 15.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.
- Magnitude
- 6.6
- Strong · mw
- Depth
- 15 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- VII
- Very strong (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
112 kilotons of TNT
That is about 7 times the Hiroshima bomb. It released about 234 times the energy of a magnitude 5.0.
Tectonic setting
126 km
from the nearest mapped plate boundary, between the North Andes and South American plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
15 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 100 km
USGS has not published any M2.5+ earthquake within 100 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 2 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 8 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 300 recorded deaths. The most severe:
- 1797M8.0
Sw. Sumatra
10 Feb 1797 · 269 km away · intensity IX
300 deathsModerate damage ($1–5M)tsunami
- 1909M7.6
Sw Sumatra: Kerintji, Redjanglebong
3 Jun 1909 · 234 km away
Severe damage ($5–24M)tsunami
- 1926M6.6
Sumatera
28 Jun 1926 · 0 km away · intensity IX
Moderate damage ($1–5M)tsunami
- 1926
Sumatra
5 Jul 1926 · 120 km away
Moderate damage ($1–5M)
- 1861M6.5
Sw. Sumatra
25 Sep 1861 · 234 km away
Limited damage (under $1M)tsunami
- 1908M7.5
Sw. Sumatra
6 Feb 1908 · 278 km away
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.