Posted by: Matthew Haney (mhaney@usgs.gov), Sun Nov 23, 2025 17:36 (1736 UTC)
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"Significant" located earthquakes for November 21, 2025 (picking by Scott Stihler):

Iliamna: 4; Shishaldin: 3; Aniakchak: 2; Martin: 2; Novarupta: 2; Augustine: 1; Katmai: 1

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Iliamna (4 EQs):
1 EQ ~1 km ESE of the summit
ML -0.1; Z = -2.2 km

1 EQ ~11 km SE of the summit
ML -0.6; Z = 4.8 km

1 EQ ~4 km NNE of the summit
ML -0.8; Z = 0.8 km

1 EQ ~2 km SE of the summit
ML -1.0; Z = 1.9 km


Shishaldin (3 EQs):
1 low frequency EQ ~13 km W of the summit
ML 1.8; Z = 8.6 km

1 EQ ~3 km WSW of the summit
ML 1.3; Z = 9.4 km

1 low frequency EQ ~1 km SW of the summit
ML 1.2; Z = -2.3 km


Aniakchak (2 EQs):
1 moderately deep low frequency EQ ~13 km NE of the Vent Mountain
ML 1.4; Z = 11.8 km

1 moderately deep low frequency EQ ~5 km ENE of the Vent Mountain
ML 1.1; Z = 10.1 km


Martin (2 EQs):
1 EQ ~1 km WNW of the summit
ML 0.3; Z = 1.9 km

1 EQ ~1 km NW of the summit
ML -0.0; Z = 2.5 km


Novarupta (2 EQs):
1 EQ ~2 km S of the 1912 dome
ML 0.5; Z = 3.6 km

1 EQ ~3 km SSE of the 1912 dome
ML -0.2; Z = 2.7 km


Augustine:
1 EQ ~0 km W of the summit
ML -0.4; Z = -0.2 km


Katmai:
1 EQ ~3 km NW of the summit
ML 0.9; Z = 3.5 km

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