Reviewed by USGSAlaska Peninsula115y ago
M6.8 earthquake in Event 48 Novarupta-Mount Katmai area, Alaska Peninsula
Monday, June 10, 1912, 16:06:06 UTC · 58.270°N, 155.190°W
A magnitude 6.8 earthquake struck in Event 48 Novarupta-Mount Katmai area, Alaska Peninsula on Monday, June 10, 1912, 16:06:06 UTC, at a depth of 5.0 km (shallow). No earthquake of this size or larger appears within 300 km in the USGS catalog since 1900.
- Magnitude
- 6.8
- Strong · mw
- Depth
- 5 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
201 kilotons of TNT
That is about 13 times the Hiroshima bomb. It released about 422 times the energy of a magnitude 5.0.
Tectonic setting
300 km
from the nearest mapped plate boundary, between the North American and Pacific plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
5 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 lists 2 M2.5+ earthquakes within 100 km in the following 30 days. 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 46 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. The most severe:
- 1900M8.3
Kodiak Island
9 Oct 1900 · 166 km away · intensity VIII
Limited damage (under $1M)
- 1788M8.0
Unga Island
21 Jul 1788 · 192 km away · intensity VII
Limited damage (under $1M)tsunami
- 1792
Kodiak Island
1792 · 237 km away · intensity VII
Limited damage (under $1M)tsunami
- 1906M7.6
Aleutian Islands
23 Dec 1906 · 176 km away
- 1912M7.5
Alaska Peninsula
7 Nov 1912 · 86 km away · intensity V
- 1854
Gulf Of Alaska
27 Jan 1854 · 237 km away · intensity V
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.