Tectonics in the Region around Susitna

Faults and shallow earthquakes in the region surrounding this proposed Susitna-Watana hydroelectric reservoir.

Geologists map faults as active (Class A), likely-to-be-active (Class B), and unknown (Class C).  A fault known to be active will produce earthquakes in the future.  However, major earthquakes have often occurred on faults not previously identified as active, if identified at all.  Alaska has many known faults, and frequently experiences shallow (<35 km depth) earthquakes for which no fault has yet been identified.


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