Department of Earth Sciences “A. Desio”
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Transcript of Department of Earth Sciences “A. Desio”
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•Our living planet, from the Earth’s surface to the lower
mantle
Roberto Sabadini
Department of Earth Sciences “A. Desio”University of Milano
Italy
• LNGS-Italy, February 09th, 2009
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LithosphereUpper Mantle
Lower Mantle
Core
Animazione Plume
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Satellite data (GRACE, GOCE, GPS,SAR)
Three kinds of data:
- Perturbations in the gravitational field- Horizontal surface deformation (GPS)- Vertical surface deformation (SAR)
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General Scheme
Satellite Data
Solid Earth Phenomena:Model Predictions
comparison
PRESENT DAY MASS CHANGES
MANTLE VISCOSITY
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SLR and GRACESatellite Laser Ranging
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August 2002
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April 2007
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Periodic Signal
Annual
Semi-Annual
9-month 7.2-month
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The Map of Mass Variation Trend - Filtered
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The Post Glacial Rebound
core
core
core
Isostatic Adjustment
Deglaciation
Isostatic Adjustment
mantle
mantle
mantle
The Mantle Viscosity drives the Rebound
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The Map of Mass Variation Trend - Filtered
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GRACE up 30 - All
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Global Problem - Search for best viscosity
Cleaned GRACE
UP = 3.1x1020 Pa s
LW = 1.5x1023 Pa s
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BARLETTA V.R., R. SABADINI AND A. BORDONI, ISOLATING THE PGR SIGNAL IN THE GRACE DATA: IMPACT ON MASS BALANCE ESTIMATES IN ANTARCTICA AND GREENLAND, GEOPHYSICAL JOURNAL INTERNATIONAL, DOI: 10.1111/J.1365-246X.2007.03630.X, 2008.
BARLETTA V.R. AND A. BORDONI, CLEARING OBSERVED PGR IN GRACE DATA AIMED AT GLOBAL VISCOSITY INVERSION: WEIGHETED MASS TRENDS TECHNIQUES, GEOPHYSICAL RESEARCH LETTERS, DOI: 10.1029/2008GL036429, 2009
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MediterraneoMediterraneo
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SAR: acquisizione dati
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Horizontal principal strain rate tensor
Model B:active convergence
+subduction forces in the Hellenic (deep slab) and Calabrian arcs
f = 0.05Jimenez-Munt, I. et al., Active deformation in the Mediterraneanfrom Gibraltar to Anatolia inferred from numerical modeling and Geodetic and seismological data, JGR, 2003
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Dati SAR – Umbria-Marche (Terremoto 1997)
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DALLA VIA G., CRIPPA B., TORALDO SERRA E.M., GIACOMUZZI G. AND SABADINI R., EXPLOITATION OF HIGH-DENSITY DINSAR DATA POINTS OF THE UMBRIA-MARCHE (ITALY) 1997 SEISMIC SEQUENCE FOR FAULT CHARACTERISTICS, GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L17301, DOI:10.1029/2007GL030718,2007
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Normal mode relaxation theory Normal mode relaxation theory and new generation space missions:and new generation space missions:
at the cutting-edge of the at the cutting-edge of the Physics of Earth’s interiorPhysics of Earth’s interior