Download - Fennoscandian Uplift Observed with Absolute Gravity Measurements in the Period 1991 to 2003
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
Fennoscandian Uplift Observed with Fennoscandian Uplift Observed with Absolute Gravity Measurements in the Absolute Gravity Measurements in the
Period 1991 to 2003Period 1991 to 2003 H. Wilmes 1), R. Falk 1), F. Klopping 2), E. Roland 3),
A. Lothhammer 1), A. Reinhold 1), B. Richter 1), H.-P. Plag 3), J. Mäkinen 4)
1) Bundesamt für Kartographie und Geodäsie (BKG), Germany 2) National Oceanographic and Atmospheric Administration (NOAA), U.S.A.
3) Norwegian Mapping Authorities (NMA), Norway 4) Finnish Geodetic Institute (FGI), Finland
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
Project with participation of:
• NGS / NOAA (USA)• BKG (Germany)• NMA / Statens Kartverk (Norway)• FGI (Finland)• Lantmäteriet (Sweden)
K oszalin
Pasewalk
R ostockF len sbu rg
Vasa
M etsahovi
Trom soe
K irun a
F u ru oegrun d
M artsbo
O nsala
H oen efoss
Tron dh eim
Trysil
S tavan ger
Vagstran da
Absolute Gravity Determination in the Scandinavian Land-Uplift Zone 1991 - 2003
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
Absolute gravity measurements in Martsbo/Sweden
Mårtsbo (S), observed gravity changes
gmean@125 cm = 981 923 082,4 µGal (gradientmean = 287,5 µGal/m)
-15
-12
-9
-6
-3
0
3
6
9
12
15
1991 1993 1995 1997 1999 2001 2003
[µG
al]
JILAg-5
FG5-111
FG5-101
FG5-301
Martsbo(Sweden)
-1,29 µGal / year± 0,3 µGal / year
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
Sta
tio
n
Ob
se
rva
-ti
on
s
Pe
rio
d
ye
ars
up
lift
rate
in
µ
Ga
l/ye
ar
up
lift
rate
in
µ
Ga
l/ye
ar
up
lift
rate
in
µ
Ga
l/ye
ar
Stavanger AA 4 91-03 11,9 -0,6 +/- 0,18 -0,5 +/- 0,51 -0,4 +/- 0,44Hoenefoss AB 3 93-03 9,8 -1,0 +/- 0,23 -1,0 +/- 0,54 -1,0 +/- 0,54
Hoenefoss AC * 2 95-03 7,7 -0,6 -0,6 -0,6Trysil AC 6 93-03 9,9 -1,2 +/- 0,20 -1,1 +/- 0,30 -1,1 +/- 0,30
Trysil AC with AB 9 93-03 9,9 -1,2 +/- 0,18 -1,2 +/- 0,28 -1,2 +/- 0,28Trondheim AA 3 95-03 7,8 -2,5 +/- 0,30 -2,5 +/- 0,76 -2,5 +/- 0,76Tromsoe AA 5 92-03 11,3 -0,3 +/- 0,51 -0,4 +/- 0,37 -0,4 +/- 0,32
Kiruna * 2 95-03 7,8 -1,1 -1,1 -1,1Furuoegrund AA 5 92-03 11,4 -2,0 +/- 0,18 -2,0 +/- 0,44 -1,9 +/- 0,38
Mårtsbo AA 4 93-03 10,3 -1,3 +/- 0,27 -1,3 +/- 0,54 -1,3 +/- 0,46Onsala AS 6 93-03 10,3 -0,9 +/- 0,20 -0,9 +/- 0,33 -0,8 +/- 0,29
Onsala AS with AN 9 93-03 10,3 -0,9 +/- 0,18 -0,9 +/- 0,30 -0,8 +/- 0,26
FG5 and JILAg-5 propagation of à priori errors
1 σ
err
or
es
tim
ate
—
—
FG5 only,simple line fit
FG5 only,propagation of à priori errors
1 σ
err
or
es
tim
ate
—
1 σ
err
or
es
tim
ate
—
—
—
Observed Mean Gravity Rates
* only 2 observations
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
GPS at Martsbo
GPS-time serieEPN (EUREF Permanent Network)
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
Outline
K oszalin
Pasewalk
R ostockF len sburg
Vasa
M etsahovi
Trom soe
K irun a
F uru oegrun d
M artsbo
O nsala
H oen efoss
Tron dheim
Trysil
S tavan ger
Vagstran da
10 mm / year(Kaniuth/Vetter 2004)
-2 µGal / year
G PS up lift ra tes
(BIFROST 2001)
G PS up lift ra tes 10 mm / year
G ra vity c ha nges
Compilation of gravity changes and GPS uplift rates
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
Conclusions
• More than 10 years of absolute gravity observations clearly reveal long term gravity changes related to post glacial uplift
• Combination of data from different groups and instruments make instrumnet monitoring and comparison an importand precondition
• Seasonal gravity variations are not accesible with present data and have been assigned for in the error estimation
• The local gravity field at the stations need to be checked.(e.g. building activities in Trondheim cover the gravity signal)
• More complete environmental data improve the description of seasonal gravity variations
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
European Combined Geodetic Network ECGN- Status Report -
Website of ECGN Project
http://www.bkg.bund.de/ecgn
ECGN Website Guidelines and Forms with links to guidelines and forms for the different observation techniques
Johannes Ihde, Trevor Baker, Carine Bruyninx, Olivier Francis, Martine Amalvict, Ambrus Kenyeres, Jaakko Makinen, Steve Shipman, Jaroslav Simek, Herbert Wilmes
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
European Combined Geodetic Network ECGN- Status Report -
• Maintenance of long time stability of the terrestrial reference system with an accuracy 10-9 for Europe especially in the height component
• In-situ combination of geometric positioning (GPS) with physical heights and other Earth gravity parameters in 1 cm-accuracy level
• Modelling of influences of time depended parameters of the solid Earth of the Earth gravity field, the atmosphere, the oceans, the hydrosphere for different applications of positioning
Integrated European Reference System for Spatial Reference and Gravity
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
European Combined Geodetic Network ECGN- Status Report -
This call concerns the elaboration of the observation network of ECGN stations with the standard observation techniques:
GNSS (GPS/GLONASS, GALILEO) – permanent
Gravity (super conducting gravimeter – permanent
and/or absolut gravimeter) or repeated
Levelling connections to UELN/EVRS – repeated
Tide gauges – permanent
Meteorological parameters – permanent.
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
European Combined Geodetic Network ECGN- Status Report -
ECGN status 1st call proposals
•20 countries•72 stations with
GPS (EPN)absolut gravity levelling to EVRS 6 super conducting gravimeters 15 tide gauges
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
European Combined Geodetic Network ECGN- Status Report -
Meta Data – in general the ECGN project based on existing
data– only the information about the data i.e. meta
data should be collect– therefore in the meta data form the availability
of the data and the access to the data should be described
– the local ties are also a part of the form– ECGN Meta Data Form (see ECGN Website –
PDF/TXT File)
Present Status, ECGN Meta Data Base
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
European Combined Geodetic Network ECGN- Status Report -
The second ECGN call is still a matter of further discussions. It will include the status of the project (stations, data availability, meta database, data policy). In a second call it could be asked for:
• Methodical investigations for the combination of spatial observation data with gravity field related data
• AG/SG combination• AG/SG array for GOCE validation• Combination of space techniques (GPS/GLONASS,
GALILEO, VLBI, SLR)• Single station analysis of different observation techniques• Analysis centers for the combination of time series of all
ECGN stations• Establishment of co-operations to solve the above
mentioned questions
Methodology and Analysis (2nd Call postponed)
Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4
Construction of an integrated geodetic network in Germany
-permanent GPS
-Levelling
-Absolute gravity measurements and SCG stations