Contribution of GGP to GGOS

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Contribution of GGP to GGOS

• David Crossley
• Earth and Atmospheric Sciences, Saint Louis
  University, St. Louis, USA
• J. Hinderer
• IPG/EOST Strasbourg, France

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GGP Organization

• GGP is now an Inter - Commission Project of IAG
  (like WEGENER)
• Reports to
• Commission 2 The Gravity Field
• Commission 3 Earth Rotation and Geodynamics
• (Inter Commission Project 3.1)
• Chair D. Crossley
• Secretary J. Hinderer
• Meetings 1 per year (next - IUGG Perugia)
• Workshops 1 every year or two (last - Jena,
  March 2006).
• Newsletters as needed

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Current European SGs, and Suggested Network
Extensions
Pecny
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10 years
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How Can GGP Help GGOS?

• Provide access to GGP database expand GGP
  mailing list to GGOS representatives (Newsletters
  etc.)
• 2. Undertake a project within GGP to record
  and report on all GPS measurements at the
  stations these are necessary anyway to account
  for height variations that contribute to gravity
  variations
• 3. Undertake a project within GGP to record
  and report all Absolute Gravity measurements made
  at the GGP sites these would be benchmark
  measurements (one point with error bar and
  supplementary information).

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continued

• 4. Assist in the coordination of future
  Absolute Gravimeter Intercomparisons at a site
  (or sites), where there is an SG.
• 5. Be receptive to joint initiatives in
  geodesy or tectonics where the use of an SG would
  significantly improve the interpretation of
  measurements from other instruments.
• Examples
• (a) be a base station for network monitoring of
  volcanoes
• (b) assist in the determination of hydrology
  experiments
• (c) establish new stations (e.g. in Northern
  Europe) to strengthen the co-observation of
  gravity field variations with satellite missions
  such as GRACE and GOCE.

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SG AG comparisons ALWAYS instructive!
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GGP GRACE ground / satellite comparisons with
hydrology. New challenges with an enhanced
European SG array?
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SG array monitoring of co-seismic static
deformation (Imanishi et al., 2005) following a
large earthquake
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Canadian AG measurements of episodic slip at the
Cascadia subduction zone in the Pacific NW
(Lambert et al., 2005). Wish there was an SG
nearby!
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Measurements of gravity and deformation just
before the collapse of the dome of the
Miyakejima Volcano, Japan in 2000 (Furuya et al.
2003). Ideal situation for SG to act as a base
station.
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Planned GGP Stations

• India - will be operating in northern India near
  Dehradun by Wadia Institute of Himalayan Geology
  China - will be operating in Wuhan by China
  Earthquake Administration. Czech Republic -
  will be operating at Pecny GFZ - Brazil in
  Amazon Basin Two in the US - one will operate
  at Sunspot New Mexico in Lunar Ranging Station
  the second for hydrology near Austin, Texas.