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Iliamna volcano M2.2 | Alaska Earthquake Center

Iliamna volcano M2.2 |  Alaska Earthquake Center


59.8887°N 153.0914°W Depth 55.7 miles (90 km)

This event has not been reviewed by a seismologist

36 miles (58 km) east of Pedro Bay 38 miles (61 km) north of Augustine Volcano 43 miles (69 km) south of Redoubt Volcano 45 miles (72 km) west of Anchor Point 47 miles (76 km) southeast of Port Ellsworth 50 miles (81 km) km) ) W of Ninilchik 55 miles (89 km) NW English Bay 55 miles (89 km) NW Nanwalk 57 miles (92 km) W Homer 58 miles (94 km) NW Port Graham 58 miles (94 km) NW Seldovia 142 miles (230 km) southwest of Anchorage 147 miles (238 km) north of Kodiak Strength Type: Ml2 Event Type: Tectonic Earthquake Setting of Southern Alaska Earthquakes in south-central Alaska are produced by a number of different tectonic features. (1) The strongest earthquakes in south-central Alaska are generated by the massive fault that represents the contact zone between the dominant Pacific plates and the North American plates. The 1964 M9.2 Great Alaska Earthquake, which remains the second largest earthquake ever recorded worldwide, originated beneath Prince William Sound. (2) Moderate-depth earthquakes (less than 20 miles/32 km) occur in the Wadati-Benioff zone, where the subducting Pacific plate dips into the mantle beneath the North American plate. This region extends along the Aleutian Arc, Alaska Peninsula, and Cook Harbor and ends below the northern slopes of the Alaska Range. In southern and central Alaska, this seismic activity subsides to a depth of about 140 miles (225 km), reflecting the subducting extension of the Pacific Plate. The 2016 M7.1 Iniskin earthquakes and 2018 M7.1 Anchorage earthquakes are recent notable mid-depth events. Both produced a major earthquake in the south-central region and resulted in structural damage to buildings and infrastructure. (3) Crustal earthquakes in this region can be attributed to three main sources: faults and folds in the Cook Inlet basin, the Castle Mountain fault, and the broad band of diffuse earthquakes extending from the northern Cook Inlet to the Denali fault. Certain geological structures in the upper Cook Inlet area are capable of generating strong earthquakes. The M6.9 earthquake of April 1933, which caused extensive damage in Anchorage, appears to have occurred in such a structure. The Castle Mountain Fault, which runs 25 miles (40 km) north of Anchorage, shows geological evidence of Holocene displacements, and generated the 1984 M5.6 Sutton earthquake. The widespread seismic zone between the Cook Inlet and Denali Fault may represent a deformation zone between The Bering Little Plate to the west and the Southern Alaska Block to the east. This broad zone of seismic activity includes a series of mostly thrust faults, and the 1943 M7.0 earthquake may have originated in this zone.




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