other event · reviewed by a seismologist
M 1.7ml
132 km SSE of McCarthy, Alaska
No: USGS classifies this as a other event, not an earthquake. A magnitude 1.7 other event was recorded 132 km SSE of McCarthy, Alaska at 22:49 UTC on 2023-08-01, less than 1 km deep.
- When
- Magnitude
- M 1.7 (ml)
- Depth
- 0.0 km below the surface
- Felt
- no reports yet
- Nearest
- Yakutat City and Borough, 92 km ESE
- Nearest mapped fault
- Kosakuts fault (Chugach-St. Elias fold and thrust belt), under 1 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1189 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
USGS catalogues this as other event, not an earthquake.
How big was it?
This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 89× the energy of this one
- This earthquake M 1.7 about 11 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:
- 7.1 113 km SE of McCarthy, Alaska · 39 km NNE of this epicentre
- 5.9 115 km NW of Yakutat, Alaska · 39 km ESE of this epicentre
- 5.5 112 km NW of Yakutat, Alaska · 40 km ESE of this epicentre
- 5.2 104 km NW of Yakutat, Alaska · 50 km ESE of this epicentre
- 5.1 103 km NW of Yakutat, Alaska · 49 km ESE of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 60.3391, -141.9535. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Yakutat City and Borough, AK | 92 km (57 mi) | ESE | earthquakes near Yakutat City and Borough |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.7 127 km SSE of McCarthy, Alaska
- 1.6 119 km SSE of McCarthy, Alaska
- 1.5 128 km WNW of Yakutat, Alaska
- 2.0 126 km SSE of McCarthy, Alaska
- 2.1 112 km WNW of Yakutat, Alaska
- 1.5 133 km NW of Yakutat, Alaska
- 1.6 95 km SSE of McCarthy, Alaska
- 1.6 114 km SSE of McCarthy, Alaska
- 1.6 122 km WNW of Yakutat, Alaska
- 2.5 123 km WNW of Yakutat, Alaska
- 3.4 134 km SE of McCarthy, Alaska
- 1.5 114 km WNW of Yakutat, Alaska
- 2.5 116 km WNW of Yakutat, Alaska
- 2.0 114 km WNW of Yakutat, Alaska
- 2.2 117 km WNW of Yakutat, Alaska
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.