Posted by: Matthew Haney (mhaney@usgs.gov), Fri Dec 12, 2025 01:57 (0157 UTC)
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"Significant" located earthquakes for December 11, 2025 (picking by Scott Stihler):

Iliamna: 7; Martin: 5; Katmai: 3; Edgecumbe: 2; Redoubt: 2; Semisopochnoi: 2; Augustine: 1; Little Sitkin: 1; Novarupta: 1; Okmok: 1; Spurr: 1; Tanaga: 1

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Iliamna (7 EQs):
1 EQ ~4 km ENE of the summit
ML -0.4; Z = 2.1 km

1 EQ ~4 km NE of the summit
ML -0.4; Z = 2.2 km

1 EQ ~2 km NE of the summit
ML -0.5; Z = 1.7 km

1 EQ ~3 km S of the summit
ML -0.5; Z = 0.7 km

1 EQ ~1 km NNE of the summit
ML -0.9; Z = -1.0 km

1 EQ ~2 km SSW of the summit
ML -0.9; Z = 0.8 km

1 EQ ~2 km SE of the summit
ML -0.9; Z = 0.4 km


Martin (5 EQs):
1 EQ ~2 km N of the summit
ML 1.4; Z = 2.8 km

1 EQ ~0 km ESE of the summit
ML 1.2; Z = 0.0 km

1 EQ ~2 km N of the summit
ML 0.9; Z = 1.0 km

1 EQ ~0 km NNW of the summit
ML 0.3; Z = 1.7 km

1 EQ ~1 km NW of the summit
ML 0.1; Z = 2.0 km


Katmai (3 EQs):
1 EQ ~2 km NW of the summit
ML 0.5; Z = 2.9 km

1 EQ ~3 km NW of the summit
ML -0.0; Z = 3.1 km

1 EQ ~2 km WNW of the summit
ML -0.1; Z = 3.7 km


Edgecumbe (2 EQs):
1 EQ ~3 km NE of the summit
ML 0.3; Z = 8.3 km

1 EQ ~4 km N of the summit
ML 0.1; Z = 6.0 km


Redoubt (2 EQs):
1 EQ ~17 km ENE of the summit
ML 0.5; Z = 13.5 km

1 low frequency EQ ~2 km SSW of the summit
ML -0.6; Z = -0.8 km


Semisopochnoi (2 EQs):
1 EQ ~12 km SSW of the Mount Young
ML 2.1; Z = 11.5 km

1 low frequency EQ ~15 km SW of the Mount Young
ML 1.9; Z = 8.4 km


Augustine:
1 EQ ~1 km SW of the summit
ML -0.3; Z = -0.1 km


Little Sitkin:
1 EQ ~4 km SW of the summit
ML 0.7; Z = 1.1 km


Novarupta:
1 EQ ~2 km NNW of the 1912 dome
ML -0.9; Z = 0.4 km


Okmok:
1 EQ ~7 km ENE of the center of caldera
ML -0.8; Z = 0.1 km


Spurr:
1 low frequency EQ ~3 km N of the summit
ML 0.8; Z = 1.9 km


Tanaga:
1 EQ ~1 km N of the summit
ML 0.8; Z = 5.4 km

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