Earthquake

Teachable Moment from IRIS - Magnitude 6.0 San Francisco Bay Area, 08/24/14

IRIS

IRIS does an excellent job collecting and preparing resources we can use in our classrooms on recent, significant earthquakes. Check out their PowerPoint, visualizations and animations on this powerful earthquake (M6.0), when early Sunday morning, the Bay Area was awakened by the biggest earthquake the region has experienced since the Loma Prieta earthquake nearly 25 years ago.  The earthquake was centered 6 miles (10 km) south of the city of Napa, which is located about 50 miles northeast of San Francisco.

Teachable Moment from IRIS - Magnitude 7.9 Rat Islands, Aleutian Islands, Alaska

Magnitude 7.9 Rat Islands, Aleutian Islands, Alaska

IRIS does an excellent job collecting and preparing resources we can use in our classrooms on recent, significant earthquakes. Check out their PowerPoint, visualizations and animations on this powerful earthquake (M7.9) that occurred in a remote area of the volcanic Aleutian Islands. The epicenter was located 19 km (11 miles) ESE of Little Sitkin Island, Alaska, while the depth was 108 km below Earth’s surface.

Tectonics & Earthquakes of Alaska

From IRIS  --  Alaskan tectonics are dominated by Pacific-North American plate interaction. The megathrust boundary between the plates results in both the 4,000-km-long Aleutian Trench and in the arc of active volcanoes that lie subparallel to the trench. This animation discusses the range of tectonic activity from megathrust earthquakes to accretion of geologic terranes. Along the trench, the rate of convergence ranges from 5 cm/year on the east to 7.8 cm/year on the west. The angle of subduction also changes from shallow in the east to steep in the west.

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