Department of Earth Sciences “A. Desio”

•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

LithosphereUpper Mantle

Lower Mantle

Core

Animazione Plume

Satellite data (GRACE, GOCE, GPS,SAR)

Three kinds of data:

- Perturbations in the gravitational field- Horizontal surface deformation (GPS)- Vertical surface deformation (SAR)

General Scheme

Satellite Data

Solid Earth Phenomena:Model Predictions

comparison

PRESENT DAY MASS CHANGES

MANTLE VISCOSITY

SLR and GRACESatellite Laser Ranging

August 2002

April 2007

Periodic Signal

Annual

Semi-Annual

9-month 7.2-month

The Map of Mass Variation Trend - Filtered

The Post Glacial Rebound

core

core

core

Isostatic Adjustment

Deglaciation

Isostatic Adjustment

mantle

mantle

mantle

The Mantle Viscosity drives the Rebound

The Map of Mass Variation Trend - Filtered

GRACE up 30 - All

Global Problem - Search for best viscosity

Cleaned GRACE

UP = 3.1x1020 Pa s

LW = 1.5x1023 Pa s

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

MediterraneoMediterraneo

SAR: acquisizione dati

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

Dati SAR – Umbria-Marche (Terremoto 1997)

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

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