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Mt Churchill volcano (Alaska): earthquake swarm
Map of recent earthquakes at Mt Churchill volcano in eastern Alaska
Friday, Jul 19, 2013
A seismic swarm with magnitudes up to 3.5 has been occurring in the Wrangell Arc about 40 km NE of Mt. Churchill volcano during the past few days. The intensity and frequency of the quakes has calmed down yesterday. ... [more]
 

Churchill volcano

Stratovolcano 5005 m / 16,420 ft
United States, Eastern Alaska, 61.38°N / -141.75°W
Current status: dormant (1 out of 5) | Reports
Churchill volcano books
Last update: 19 Jul 2013 (seismic swarm in mid July)
Typical eruption style: unspecified
Churchill volcano eruptions: 800 AD ± 100 years
TimeMag. / DepthDistanceLocation
Sun, 15 Apr
Sun, 15 Apr 22:21 UTCM 1.0 / 18.8 km48 km- 140km NNE of Cape Yakataga, Alaska
Wed, 11 Apr
Wed, 11 Apr 23:14 UTCM 1.6 / 13.4 km34 km- 141km E of Chitina, Alaska
Wed, 11 Apr 21:42 UTCM 1.4 / 14.4 km35 km- Southern Alaska
Fri, 6 Apr
Fri, 6 Apr 17:19 UTCM 2.337 km- 175km NNE of Cape Yakataga, Alaska
Fri, 6 Apr 11:50 UTCM 1.633 km- 170km E of Chitina, Alaska
View all recent quakes

Background:

The Bona-Churchill massif in the St. Elias Mountains forms the highest Quaternary volcano in the United States. A 2.7 x 4.2 km wide caldera caps the summit of 4766-m-high Mount Churchill, which is now known to be the source of the White River Ash, produced during two of the largest explosive eruptions in North America during the past 2000 years (McGimsey et al. 1992). The 5005-m-high summit of Mount Bona lies 4 km across a high saddle from the younger Mount Churchill. The source vent of the widespread bilobate White River Ash deposit, which blankets more than 340,000 sq km of eastern Alaska and NW Canada, was initially thought to be a pumice mound that is mostly buried beneath the Klutlan Glacier NE of Churchill volcano. More recent work has revealed thick young pumice deposits mineralogically and chemically similar to the White River Ash deposits along the rim of the Mount Churchill caldera.
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Smithsonian / GVP volcano information


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