[Geoqus] Mantle viscosity at EGU 2012

[Wouter van der Wal - LR]

Hi Holger,

Thanks for the notice. Mantle viscosity and glacial isostatic adjustment is my favorite word combination. 
I didn't come to the last sessions at AGU, so I missed you and Rebekka. Exhaustion was taking its toll on my old body..
Anyway, I wish you both a happy and fruitful new year! When you awake from hybernation in Calgary it will soon be time for EGU and we will meet there. 

Wouter 

> -----Original Message-----
> From: 
> geoqus-bounces+w.vanderwal=tudelft.nl at lists.ruhr-uni-bochum.de
>  
> [mailto:geoqus-bounces+w.vanderwal=tudelft.nl at lists.ruhr-uni-b
ochum.de] On Behalf Of Holger Steffen
> Sent: donderdag 5 januari 2012 20:16
> To: Geoscientific Abaqus User Group
> Subject: [Geoqus] Mantle viscosity at EGU 2012
> 
> (with apologies for multiple postings)
> 
> Dear colleagues,
> 
> We would like to announce our mantle viscosity and glacial 
> isostatic  adjustment session at EGU2012 and encourage you to 
> submit an abstract:
> 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> GD3.4/G3.3/TS1.7
> Mantle viscosity and the post-glacial uplift
> 
> EGU General Assembly in Vienna: 22 to 27 April 2012 Deadline 
> for abstract submission: 17 January 2012, 24:00 CET
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> We are pleased to announce our invited presenter Larry Cathles!
> 
> More information on our session can be found below and on:
> http://meetingorganizer.copernicus.org/EGU2012/session/9634
> 
> We look forward to discussing mantle viscosity with you!
> 
> Willy and Holger
> 
> ---------------------------------------------------------------------
> 
> GD3.4/G3.3/TS1.7
> Mantle viscosity and the post-glacial uplift
> Conveners: Willy Fjeldskaar and Holger Steffen
> 
> Scientific investigations of the glacial isostatic adjustment 
> (GIA)  started in the early 18th century in Fennoscandia, and 
> since then various  data have been collected, e.g. relative 
> sea-level (RSL), tide gauges  records, leveling, GPS, 
> absolute and relative gravity measurements, and  nowadays 
> also data from satellite missions. With the help of these 
> data  investigations regarding the mantle structure have been 
> made in Fennoscandia, North America and a few other regions 
> in the world.
> 
> However, there are still remarkable differences in the 
> resolved properties of the mantle, especially in 
> Fennoscandia. Early results, for example,  include a 100 km 
> thick low viscosity asthenosphere with 1.3×10**19 Pa s  (van 
> Bemmelen and Berlage, 1935), a 200 km thick asthenosphere 
> with 10**20 Pa s (McConnell, 1968), a 75 km thick 
> asthenosphere with 4 × 10**19 Pa s  (Cathles, 1975), and a 
> 100 km thick asthenosphere with 1.2×10**19 Pa s  (Wolf, 
> 1987). GIA modeling has undergone a huge improvement since 
> its  beginning. Nowadays with the computational power, 3D 
> spherical models  based on different techniques are mainly in 
> use. They include the  theoretical basics such as sea-level 
> equation, earth rotation and, partly, self gravitation.
> 
> Appropriate regional models also exist, which may allow the 
> inclusion of  crustal structures such as sedimentary basins 
> and faults for selected  special investigations such as 
> post-glacial-induced earthquakes. The Earth structure beneath 
> Fennoscandia seems now to be generally characterized by  a 
> laterally varying lithosphere with a thick root of more than 
> 200 km in  central-east Fennoscandia, then becoming thinner 
> to the outer parts.
>  South-west Sweden is expected to have about 100 km, the 
> German North Sea  coast as well as the Norwegian Atlantic 
> coast about 80 km. A low-viscosity asthenosphere underneath 
> the elastic lithosphere is still under debate.
>  The upper-mantle viscosity can be bracketed between 10**20 
> and 10**21 Pa  s, whereas the latest results calculated from 
> different data yield between (3-8)×10**20 Pa s. The viscosity 
> is getting higher towards the lower  mantle.
> 
> In this session we invite papers, which are focused on 
> determination of  the mantle viscosity from post-glacial 
> rebound and its importance and  impact on GIA phenoma around 
> the world.
> 
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> ._____________________________________.
> |                                     |
> | Dr. Holger Steffen                  |
> | Department of Geoscience            |
> | University of Calgary               |
> | 2500 University Drive NW            |
> | Calgary, AB, T2N 1N4                |
> | Canada                              |
> |                                     |
> | Office: MS214                       |
> | Phone:  +1 403 210 6476             |
> | Fax:    +1 403 284 0074             |
> | Email:  sholger at ucalgary.ca         |
> | Web:    http://www.ucalgary/steffen |
> |_____________________________________|
> 
> 
> 
> 
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