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DORISMail               27-Aug-2004 20:23:08                   Message No 0343
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Author: Pascal Willis <Pascal.R.Willis@jpl.nasa.gov> Subject: Geodesy Section Call for Papers 


(forwarding message from the AGU)


Dear Colleagues,
This is an open "call for papers" for sessions that have been proposed
for the Fall AGU Meeting in the Geodesy Section.  Session descriptions
are below.  Please feel free to distribute this message among other
appropriate venues, as the greater the number of abstracts submitted,
the greater the odds of securing oral presentation slots at the meeting.
Please note that the electronic abstract submission deadline is 9
September at 2359 UT.  It is expected that the submission tool will
experience very heavy traffic in the last days before the deadline, so
you are encouraged to submit as early as possible. You can visit the AGU
website for additional information at http://www.agu.org/meetings/fm04
The Meeting will be held December 13-17, 2004 in San Francisco, CA. We
hope to see you there!
==========================================================
G01: Geodesy General Contributions


G02: Geophysical Synergies From Combinations of Independent Geodetic Results
One advantage of a system of multiple, independent geodetic observing
techniques is the potential to produce combined products that provide
improved geophysical insights compared to any single method in terms of
accuracy, precision, resolution, reliability, or other property. This
session will focus on studies demonstrating this potential or clarifying
the limitations of such approaches. Examples include improved
tropospheric monitoring using combined GPS, VLBI, and DORIS path delay
estimates, more accurate Earth orientation estimates using
multi-technique combinations, improved spatial resolution of surface
deformations using GPS and InSAR jointly, etc. The emphasis here is on
the enhancements to geophysical understanding that can be derived rather
than on the mechanics of combinations strategies, although papers on
this aspect are also welcome. Identification of any weaknesses in the
current networks of observing systems and ideas to address them are
appropriate as well.


G03: Earth Rotation Variations and Geocenter Motion
Space-geodetic techniques are used to monitor precisely the Earth's
rotation and the motion of its center of mass. These techniques perform
observations relating terrestrial sites to extra-terrestrial objects.
The motions of the terrestrial and celestial fiducial objects are
modelled taking into account the knowledge of plate tectonics and
deformations, solar system dynamics, quasars physics (VLBI), the Earth
gravity field (SLR, DORIS, GPS) and other effects. On the other hand,
the dynamics of the global fluids (atmosphere, ocean, hydrosphere, ...)
is also monitored and its influence on the the observed motions can be
modelled. The session topics will include the observation of these
variations and motions at long as well as short timescales, the
modelling involved in the analysis of observations and the effects of
geophysical fluids.


G04: Integrating Geodetic and Geologic Data With Models of Plate
Boundary Deformation
As paleoseismic records of earthquakes on major faults becomes more
complete and geodetic measurements of surface deformation span longer
time periods, it is becoming more important to develop techniques to
integrate the two types of data sets with models of plate boundary
deformation. To date, attempts to reconcile geologic and geodetic
measurements of crustal deformation have produced mixed results. For
example, some studies find paleoseismic slip rate estimates to be
consistent with model slip rates inverted from geodetic data, while
other studies show inconsistencies. These inconsistencies may arise from
the inadequacy of elastic and viscoelastic dislocation models, commonly
used to analyze geodetic data collected over decadal time-scales, to
capture deformation processes that are important over Holocene and
longer time-scales. This session encourages contributions that attempt
to combine geologic measurements of long-term deformation and geodetic
measurements over decadal time-scales with models of plate boundary
deformation. We particularly encourage studies that present
state-of-the-art theoretical models that include decadal and longer
time-scale deformation processes. We also welcome data oriented studies
that present geological or geophysical data relevant to the problem of
understanding how plate boundaries deform at various time scales. This
session is open to contributions spanning a broad range of plate
tectonic settings.


G05: GPS Time Series: Signal and Noise
GPS time series are the convolution of instrumental noise and a growing
number of detectable geophysical signals which operate on varying
temporal and spatial scales. While one type of signal is of interest to
a particular analysis group it may just be systematic error to another.
Interpretation of the GPS data then depends on our ability to extract a
signal of interest (usually tectonics or ground deformation associated
with global change) from the total observed signal. This session will
highlight two issues: 1) the difficulties associated with extracting a
chosen geophysical signal from GPS time series in the presence of noise
and other signals; and 2) subsequent interpretation of the chosen
signal. Papers which address the characterization of noise in GPS time
series e.g. hydrostatic zenith delay and its gradient, the ionosphere,
multipath, antenna phase center variations, reference frame
miss-modeling, etc. as well as papers focusing on the interpretation of
GPS data in terms of global change (e.g. surface mass loading, post
glacial rebound, tectonics, etc.) are encouraged. Additionally papers
exploiting the combination of GPS with other crustal deformation
techniques to extract and analyze a signal are particularly welcome.


G06: Active Deformation of the Continents Monitored by Geodesy: From
Fault to Plate Scale
Recent advances in geodesy have lead to a dramatic improvement in our
ability to monitor the active deformation of the continents on a wide
range of space and time scales. In particular, GPS can provide
continental-scale velocity fields; dense spatial sampling can be
obtained using InSAR, and time-dependent deformation can be monitored
with continuous GPS. These data are providing new constraints on models
of the earthquake cycle (fault scale) and on the dynamics of continental
deformation ("plate" scale). This session solicits contributions that
describe new observations of continental deformation obtained using
geodetic techniques. We are particularly interested in abstracts that
use geodetic observations to constrain models of the earthquake cycle or
continental deformation, and in contributions that compare or combine
geodetic data with data from other sources (e.g. seismology,
palaeoseismology, geology).


G07: Postseismic Deformation: New Observations, Models, and Syntheses
A number of large earthquakes over the past 15 years have benefited from
direct observations of postseismic deformation from GPS, leveling or
InSAR data. New models of postseismic deformation incorporate realistic
rheology and elastic structure, and studies are underway to reconcile
these models with geodetic and geologic observations of longer term
deformation. Nevertheless, the debate on the mechanisms accommodating
postseismic deformation (and hence the rheology and dynamics of fault
systems) remains open. We solicit presentations of (1) postseismic
deformation models incorporating additional constraints such as
interseismic surface deformation, geologically derived slip/uplift
rates, or other geophysical and geological data; (2) comparisons of
postseismic deformation (observations and models) in different tectonic
settings and at different timescales; (3) new observations and models of
postseismic deformation following recent earthquakes; or (4) studies
addressing longer-term implications of postseismic deformation, e.g. its
relevance to stress triggering or to the interpretation of
"interseismic" deformation fields.


G08: Recent Results and Advances in Volcano Geodesy
Over the past two decades, an extraordinary variety of new,
high-precision geodetic measurements have been applied to volcanic
systems-ranging from ground-based surveying to continuous GPS, borehole
strain and tilt devices, and satellite-based interferometric synthetic
aperture radar (InSAR). These measurements are providing increasingly
detailed information about the surface deformation associated with
magmatic processes at a variety of volcanic systems around the globe.
This session is dedicated to the integration of these new geodetic
observations with related volcanologic and geophysical observations to
constrain subsurface geometry and/or rheology and the development of
realistic models of magma intrusion and eruption. Contributions from
observational geodesy, volcano source modeling, and integrative models
of volcano dynamics are welcomed.


G09: Reference Frame Procedures in Practice to Enhance Scientific
Investigations
We solicit scientific investigators to present papers on the actual
practice of reference frames to specific scientific problems. Scientific
investigators do not necessarily apply the same conventional reference
frame procedure to all scientific problems, but often apply various
procedures appropriate to the signal under investigation. Reasons for
selecting a specific procedure might be to improve signal to noise ratio
in station coordinate time series, or to simplify the scientific
interpretation by a physically useful choice of datum, or to simplify
the analysis in cases where the choice of frame is irrelevant.
Scientists often do not require accurate determination of station
positions, but they more generally do require very precise knowledge of
station kinematics. Reference frame procedures appropriate to the study
of seasonal loading signals might be more relaxed than studies that also
require scientific interpretation of secular loading signals. Frames
used in practice for the study of secular tectonics might not be the
same as those for the study of secular loading or GIA. Depending on the
situation, frames procedures that produce globally-reference coordinate
time series (such as fiducial-free precise point positioning) may be
more or less effective for scientific interpretation of tectonics than
regionally-filtered coordinate time series. We welcome papers that
present results on the application of reference frame procedures to
specific scientific problems, and also papers that discuss the
effectiveness of different possible procedures appropriate to scientific
problems over a wide variety of spatial and temporal scales. Our
definition of 'reference frame procedure' is intended to be broad,
including spatial and temporal filtering schemes.


G10: Planetary Geodesy: An Essential Tool for Illuminating Planetary and
Solar System Dynamics
In the past decades, the planets and other bodies of our Solar System
have been targeted by numerous space missions. This is especially the
case for Mars, the Moon and Venus. Among the investigations conducted by
various instruments, the geodetic observations play an important role.
Indeed, these observations have allowed us to improve our current
knowledge of these bodies, such as their shape, dynamics and interior
structure. Geodetic investigations by Orbiters or Landers, along with
the data of previous missions or ground-based observations, allow us to
study intensively and monitor these planetary bodies. This allows
testing the models of planetary dynamics by improving the precision on
the estimation of geodetic and geophysical parameters. For this session,
we encourage papers on all subjects related to the planetary dynamics
that are illuminated by geodetic measurements, including gravity field
determination (especially time-varying gravity), rotation, interior
structure, and planetary ephemeris modeling. Papers pertaining to
geodetic results from recent or current missions (e.g. Mars Global
Surveyor, Mars Odyssey, Mars Express, MER, Galileo, Lunar Prospector,
Clementine) or future missions (e.g., Bepi-Colombo, SELENE, Messenger,
Lunar Reconnaissance Orbiter) are especially encouraged. Papers that
discuss the use of ground-based measurements as a complement to
space-based measurements are also solicited.


G11: Potential Fields in Geodynamics, Geophysics, and Geology
Potential fields (gravity and magnetism) can today be measured with high
precision and increasing resolution from land, sea, air and satellites.
An important problem is how best to combine these different sources to
create consistent data sets. Beyond data analysis, interpretation poses
the most serious problems because potential fields are integral fields
and inversion absolutely requires additional information. Many of the
questions asked are basically geological and the foremost aim of
interpretation is to understand the earth's structure, state and
dynamics. Potential fields play an important role in it. It is the aim
of the symposium to integrate the different approaches of geodesists,
geophysiscists and geologists and to stress interpretation, in
particular inverse problems on all scales in space-time. The strategy is
unavoidably to march separately but to attack the problems together


G12: Time-Variable Gravity: Observations, Analyses, and Implications
The Earth is a dynamic system - it has a fluid, mobile atmosphere and
oceans, a continually changing distribution of ice, snow, and
groundwater, a fluid core undergoing hydromagnetic motion, a mantle
undergoing both thermal convection and rebound from glacial loading of
the last ice age, and mobile tectonic plates. These processes affect the
distribution of mass in the Earth and produce variations in the Earth's
gravitational field on a variety of spatial and temporal scales. Highly
accurate measurements of the Earth's gravity field made with appropriate
spatial and temporal sampling can thus be used to better understand the
processes that move mass within the Earth, and on and above its surface.
This session will address the measurement of time-varying gravity and
their interpretation, particularly as it applies to the solid Earth,
ocean and hydrosphere, cryosphere, atmosphere and the interactions
between the various components of the Earth system. Results from
multi-satellite laser ranging and GRACE, as well as expected findings
from future missions, such as GOCE, are encouraged.


G13: Emerging Earth Science Applications of Airborne Laser Swath Mapping
Geodesy, Hydrology, and Tectonophysics
Large, high-resolution digital elevation data sets acquired via airborne
laser swath mapping present new opportunities to measure and map the
Earth's surface with an unprecedented combination of precision and
scale. This session will explore the frontiers of Earth Science research
applications of laser swath mapping data in geodesy, surface processes,
and tectonic geomorphology. Contributions should highlight new types of
research problems and results from application of airborne and/or
ground-based LiDAR (light distance and ranging) imaging. Contributions
are also encouraged to present novel techniques that overcome challenges
of processing, visualization, and measurement of large topographic data
sets.



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