EarthScope: Revealing Earth's Secrets

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• EarthScope Revealing Earth's Secrets

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Scientific Mission

• Explore the structure and evolution of the North
  American Continent, and the physical properties
  that control earthquakes and volcanoes.

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Acknowledgements

• EarthScope is funded by the National Science
  Foundation and conducted in partnership with the
  US Geological Survey.
• EarthScope is being constructed, operated, and
  maintained as a collaborative effort with UNAVCO,
  Inc., IRIS, and Stanford University, with
  contributions from NASA and several other
  national and international organizations.

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Observing Network
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What is a Continent?
Archean crust relative to the S-wave tomography
Are seismic velocities tracking primarily the
temperature or composition of the continental
lithosphere?
Goes and van der Lee (2001), van der Lee et al.
(2002)
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Episodic Tremor and Slip
Cascadia Subduction Zone
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Episodic Tremor and Slip
Cascadia Subduction Zone
Rogers Dragert (2003)
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Seismic Array Observations of Non-Volcanic Tremor
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Magnitude 2.8 July 6, 2005
July 6, 2005 San Andreas fault - M 2.8 6km
hypocentral dist.
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Strainmeter record
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SAOD Fault Contact at 10,063 ft
Metasediment
Clay Gouge
Granodiorite
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SAFOD Core Extracted
10,025-10,034 ft KB
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