H. Montag's research while affiliated with Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ and other places
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Publications (28)
Fast polarization directions α of split SKS waves in Central Europe change from NE/ENE in the western part to dominatingly E/ESE orientation towards north and east. This coincides strikingly well with the dominating trend of Hercynian deformational crustal features. It hints to frozen anisotropy related to paleo-crustal fabric. But when considering...
As a basis for many applications the terrestrial reference frame has to be determined and maintained with high accuracy. This implies the investigation of different geodetic and geodynamic parameters as well as the application of different redundant methods of measurement and analysis. The potential offered by several space geodetic techniques is d...
The modelling accuracy of the LAGEOS 1 orbit was continously improved since its launch in 1976. In spite of these experiences the modelling accuracy of LAGEOS 2 is still about 20 per cent worse. Considering e. g. only the influence of different gravity field models it has been shown that the orbital fits for arc lengths of one month is generally ab...
Earth rotation parameters with a daily and sub-daily resolution were determined using SLR and GPS data. Although both techniques can deiiver highly accurate results the GPS data have clear advantages because of the better data distribution.
The high accurate Earth Orientation Parameters (EOP) obtained by geodetic space methods in the last decade have much improved the understanding of the interaction of outer and inner forces with the Earth rotation behaviour. Besides the accuracy a better time resolution of the high-frequency part of the Earth rotation variations is important for the...
ETALON satellites, launched in 1989, have a high potential for
geodynamical and geophysical research due to their small perturbed, good
modelable orbit. Up to now there exist laser ranging data of ETALON
satellites over 2 years. This is sufficient to investigate the accuracy
of the determination of geodynamical parameters from ETALON observations
a...
Laser ranging to artificial satellites and VLBI are the only modern
geodetic techniques having a longer history of precise data acquisition
which enables the monitoring of crustal deformations in regional and
global scale. The 12-year span laser ranging data to LAGEOS were
analysed to give the tectonic motions of about 40 stations. To
investigate t...
Using the improved POTSDAM-5 orbital modelling and parameter adjustment software satellite laser ranging (SLR) data to LAGEOS from 1983 to 1990 have been analysed to estimate horizontal motion parameters for a global set of 40 laser tracking stations. These parameters were computed first by a simultaneous adjustment of station coordinates together...
In the last decades, the investigation of the kinematics and dynamics of the Earth has achieved remarkable progress in understanding and explaining a large variety of geodynamic, geophysical and geological phenomena. The impact of increasingly precise geodetic space-time measurements and analyses has contributed much to these results. The papers fo...
The plate tectonic concept has nearly revolutionized the geo-sciences in the last decades. Many geodynamical, geophysical and geological phenomena could be understood for the first time. The investigation of the present-day global crustal kinematics is a crucial contribution which can be delivered by space geodesy only. Since the beginning of the M...
The solution of the Central Institute for Physics of the Earth (ZIPE) for the realization of the terrestrial reference frame and the determination of the Earth’s rotation parameters (ERP) using satellite laser ranging data to LAGEOS of 1987 is presented. The data, constants, parameters, models and algorithms used are described. On the basis of comp...
The different cosmic-geodetic methods using artificial Earth's satellites (laser and radio wave ranging), the Moon (laser ranging) and Quasars (VLBI) are described and characterized according to the efficiency for the determination of different geodetic and geodynamic parameters. Recent results are shown for Earth's rotation parameters, station coo...
This document is intended to define the standard reference system to be used by the International Earth Rotation Service (IERS). It is based largely on the Project MERIT Standards (1983) with revisions being made to reflect improvements in models or constants since the Project MERIT Standards were published.
The POTSDAM-5 program system is based on the numerical integration of the perturbation equations. As a quasi-inertial system the mean astronomical system for the reference epoch J 2000.0 is chosen. The realization of the reference system and the force model is provided for the cm-level. Especially, the latest theories of nutation and tides are impl...
In the framework of the international MERIT project the Central Institute for Physics of the Earth, Potsdam, acted as one of the 5 designated analysis centers for the satellite laser ranging method. The orbital program POTSDAM-5, which performs a numerical integration of the orbit and in this way permits an orbital modelling and parameter estimatio...
The Lageos satellite laser ranging data of the MERIT campaign were analyzed by means of the POTSDAM-5 orbital program. A set of geocentric station coordinates was determined, with a station position internal precision of about + or - 2 cm. The pole coordinates and length of day (LOD) were estimated for overlapping 1-d, 2-d, 3-d, and 5-d intervals....
The LAGEOS satellite laser ranging data of the MERIT campaign were analysed. The internal precision of the station position is about ±2 cm. The pole coordinates and length of day (LOD) were estimated for overlapping 1-, 2-, 3- and 5-day intervals. For the 5- and 3-day resolution the precision is nearly the same, about ±0arcsec.0005 (±1.5 cm) for th...
The “Potsdam-4” program system can model satellite orbits with a high accuracy by means of numerical integration. It takes into account gravitational forces of the earth, the moon, the sun, and non-gravitational forces, and realizes an inertial system with a high accuracy. On the basis of this orbit calculation, geodetic and geodynamic parameters c...
Using the satellite laser ranging (SLR) data to Lageos in 1987 a set of station coordinates (SSC) and several series of Earth orientation parameters (EOP) were determined by the program package POTSDAM-5.
Citations
... The Explorer-22 (also known as Beacon-B) satellite was successfully tracked for ten sessions during 11 October to 13 November 1964.The expected range accuracy was about 3 m (Combrinck, 2010). Since then, the SLR technique has greatly improved in accuracy (1-2 cm), and di erent applications are routine; these range from geodynamics, geophysical studies and tests of the General Theory of Relativity (Gendt et al., 1993;Combrinck et al., 2011). ...
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... The average E-W orientation of the fast S azimuth is closer to the ENE strike of the Variscan structures (Babuska et ai, 1993) than to the absolute present-day plate motion of 130°-140° (Minster and Jordan, 1978). On the other hand, the absolute plate motions given by NUVEL-1 NNR (Argus and Gordon, 1991) and the GFZ95 solution (Montag et al, 1994;1995) show azimuths between 53° and 60°, which are closer to the observed fast S azimuths. It is thus probable that an E-W flow in the asthenosphere, related to the general N-S shortening of the central European lithosphere, probably contributes to the observed shear-wave splitting parameters (Bormann et al., 1993). ...
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... In continuation of the former years Solutions (Montag et al, 1993) an improved Set of Station Coordinates (SSC) and four sets of Earth Rotation Parameters (ERP) with different time resolution were determined. The constants and model parameters implemented in the GFZ Software package EPOS.P.V1 used for the multistage-multiarc parameter estimation procedure conform to the IERS Standards (McCarthy (Ed.), 1992) with the following exceptions: -tidal variations in UTl caused by zonal tides with periods larger than 35 days not considered, -nutation corrections derived by VLBI included, -GEM-Tl instead of T3 applied. ...
... (b) ERP (GFZ) L04 and ERP (GFZ) 97P01 Both series are individual solutions computed by the GFZ. ERP (GFZ) L04: This independent GFZ series has been computed using global SLR data to Lageos; see Montag et al. (1993, 1994). Oscillations due to zonal tides with periods up to 35 days are removed from the LOD data, but the tidal effects Sa and Ssa are still contributing to the seasonal oscillations of LOD. ...
... Software. All data were analysed by means of the POTSDAM-5 orbital program package [Gendt, 1984;Gendt and Montag, 1986]. This program is implemented according to the IERS Standards and adopts the following constants and models: For the internal computations the station and pole coordinates were shifted, so that the polar motion is centered around 0 in x r and Yr-This is convenient for the corrections of the spherical harmonics according to Chandler wobble and rotational deformation. ...
... One of the problems of all methods of determining high-frequency ERP's is the decomposition of EOP's and nutation terms. In the case of satellite methods the correlation with orbital elements has an additional influence (Montag et al. (1993)). Therefore, the high resolution of ERP's requires highaccurate measurements and modelling. ...
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... Etalon-1 and Etalon-2 were designed and launched to investigate satellite orbit dynamics of the Russian 'GLObalnaja NAvigazionnaja Sputnikowaja Sistema' (GLONASS) constellation and tailor the geopotential model to these orbits (see Table 1). The goal of these satellites was to model the Earth's gravity field to support the GLONASS program and at the same time, support international space geodesy programs, including improvements in the terrestrial reference frame, Earth rotation parameters, gravity field modeling, the gravitational constant GM, and the improvement of the selenocentric gravitational constant (Dick et al. 1993). At the initial altitude of 19130 km, the orbit was not in resonance and hence provided unique targets for these applications. ...
... The lower-layer FPD suggests that the downthrusting Indian lithosphere acts as a barrier and influences asthenosphere mantle flow (Heintz et al. 2009;Singh et al. 2006;Roy et al. 2014). Similar trends are also found in the young (Cenozoic) collisional mountain belts worldwide, where splitting FPDs are found to be aligned with plate boundaries and directed sub-orthogonal to the present-day compression direction (Silver andChan 1988, 1991;Vinnik et al. 1992;McNamara et al. 1994;Russo and Silver 1994;Bormann et al. 1996). ...
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... Once the GPS technology available it is possible to determine the position of the points in comparison with the mass center of the Earth (Montag et al., 1996), thus to define Earth-centered geodetic datums. WGS84 (World Geodetic System 1984; DMA 1986) is such a system. ...
