Magnitude 6.5KERMADEC ISLANDS

Magnitude 5.9KODIAK ISLAND, ALASKA

Two main groups of seismic waves.

Body waves travel through the Earth’s interior.

Surface waves are guided by the outer layers of the Earth.

Two types of body waves.

P-waves = Primary Waves = first arrival

S-waves = Secondary Waves = second arrival

Two types of surface waves.

Rayleigh waves: Discovered by Lord Rayleigh (1887).

Love waves: Discovered by A.E.H. Love (1911).

Magnitude 6.5KERMADEC ISLANDS

123º

Magnitude 5.9KODIAK ISLAND, ALASKA

52º

Magnitude 6.5KERMADEC ISLANDS

2009 May 16 00:53:46 UTC

Magnitude 5.9KODIAK ISLAND, ALASKA

2009 May 16 18:22:39 UTC

500 Hz

570 Hz

500 Hz

550 Hz

500 Hz

530 Hz

500 Hz

510 Hz

1 minute

Magnitude 6.3 - Fiji 2005 December 13 03:16:09 UTC

Magnitude 6.3 - Fiji 2005 December 13 03:16:09 UTC

Plate Tectonics

Earthquakes

Plate TectonicsEarthquakes correlated with:

* Mid-Ocean Ridges

* Fracture Zones

* Ocean Trenches

1980-2001 (NEIC, M5)

Mechanism of Plate Tectonics

www.bibliotecapleyades.net

Directions and Rates of Plate Motion

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U.S. Geological Survey AVO

http://whyfiles.org/031volcano/2.html