Estimating regional deformation from a combination of space and terrestrial geodetic data

Dong, Danan; Herring, Thomas A.; King, Robert W.

doi:10.1007/s001900050161

Cited by 360 publications

(266 citation statements)

References 25 publications

Supporting

Mentioning

257

Contrasting

Unclassified

Order By: Relevance

“…We solved for a free network global polyhedron which we then aligned with the ITRF97 [Boucher et al, 1999] by computing Helmert transformations on the coordinates and velocities of the 47 class A and B core IGS sites [Altamimi, 1998]. These analysis procedures have been well documented by, for example, Feigl et al [1993], Dong et al [1998], and Tregoning et al [1998a]. Detailed information regarding the geodetic solution presented in this paper is provided in Appendix A.…”

Section: Geodetic Datamentioning

confidence: 99%

Plate kinematics in the western Pacific derived from geodetic observations

Tregoning

2002

J. Geophys. Res.

View full text Add to dashboard Cite

Plate kinematics have been derived from GPS site velocities spanning Australasia and the western Pacific and define a framework in which deformation fields at plate boundaries can be investigated. The Australian Plate appears to be rigid from Cocos Island in the west to Noumea in the east and incorporating all of the Australian continent. A revision of the angular velocity vector of the Pacific Plate using six site velocities has led to the detection of significant relative motion between the Pacific Plate and sites in northern Papua New Guinea. This provides strong evidence in support of a North Bismarck Plate between the South Bismarck and Pacific Plates and we model the motion of the North Bismarck Plate with the angular velocity vector (45.0°S, 126.4°E, 0.85°/Myr). These new angular velocity vectors model the rigid plate motions of a substantial part of the Australasian and western Pacific regions with an accuracy better than 3 mm/yr.

show abstract

Section: Geodetic Datamentioning

confidence: 99%

Plate kinematics in the western Pacific derived from geodetic observations

Tregoning

2002

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…In the case of Arenal volcano, the deformation occurs at a constant rate, so it is appropriate to use a linear regression to compute the time-series. When velocities are not constant, the method could be extended using a Kalman filter (Dong et al 1998;Fournier et al 2009;Shirzaei & Walter 2010;Berrocoso et al 2012). …”

Section: Methods Extensionmentioning

confidence: 99%

“…Two approaches are used to defined it: 'generalized constrain' approach when long time-series are available on the many fiducial sites and the 'finite constrained' approach when only short time-series on few fiducial sites are available (Lisowski et al 2008;Palano 2010). In the first one, the secular velocities of the fiducial sites are computed within ITRF using a 'generalized constrain' solution (Dong et al 1998) then the Euler pole parameters and eventually, a uniform strain rate are estimated and allow to reduce the site velocities from the tectonic block motion. Although, this solution is the most rigorous approach, a long timeseries on uniformly spread fiducial sites cannot always be obtained.…”

Section: Reference System and Reference Framementioning

confidence: 99%

See 1 more Smart Citation

Integrated velocity field from ground and satellite geodetic techniques: application to Arenal volcano

Muller¹,

Potro

Biggs³

et al. 2014

Geophysical Journal International

View full text Add to dashboard Cite

S U M M A R YMeasurements of ground deformation can be used to identify and interpret geophysical processes occurring at volcanoes. Most studies rely on a single geodetic technique, or fit a geophysical model to the results of multiple geodetic techniques. Here we present a methodology that combines GPS, Total Station measurements and InSAR into a single reference frame to produce an integrated 3-D geodetic velocity surface without any prior geophysical assumptions. The methodology consists of five steps: design of the network, acquisition and processing of the data, spatial integration of the measurements, time series computation and finally the integration of spatial and temporal measurements. The most significant improvements of this method are (1) the reduction of the required field time, (2) the unambiguous detection of outliers, (3) an increased measurement accuracy and (4) the construction of a 3-D geodetic velocity field. We apply this methodology to ongoing motion on Arenal's western flank. Integration of multiple measurement techniques at Arenal volcano revealed a deformation field that is more complex than that described by individual geodetic techniques, yet remains consistent with previous studies. This approach can be applied to volcano monitoring worldwide and has the potential to be extended to incorporate other geodetic techniques and to study transient deformation.

show abstract

“…In addition, several authors (e.g., Feigl et al, 1990, Dong et al, 1998 have integrated the conventional geodetic data with recent GPS observations in order to increase the temporal resolution. The high-quality record of conventional and GPS geodetic data for Faial has allowed Catalão et al (2006) to demonstrate the feasibility and usefulness of the integrative method for deriving the source mechanisms for the Capelinhos eruption in 1958.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of the gravity geoid estimation: A case study on the Azores plateau

Catalão¹,

Bos²

2008

Physics of the Earth and Planetary Interiors

View full text Add to dashboard Cite

A numerical investigation into the effects of high-resolution heterogeneous data on the estimation of the geoid is presented for the area of the Azores plateau. Gravity data were complemented with highresolution digital terrain models, mass density models from geophysical information, and the most recent geopotential model from the CHAMP mission (GGM02) to derive a high-precision gravity model. Gravity data were reduced from the residual terrain model effects and the GGM02C model, and a grid with 1.5' spatial resolution was generated by least squares collocation. The gravimetric geoid model was computed by the direct evaluation of Stokes' integral with a spherical cap radius of 0.8 degree, with gravity data reduced by Helmert's second condensation method. The geoid model was evaluated over sea by comparison with six years of Topex/Poseidon altimeter data and an absolute agreement of 14 cm RMS was achieved after removing the bias. Over land, the geoid was compared with a total of 223 GPS/levelling points corresponding to five different vertical datums. Locally adjusted solutions were determined for each island with a four-parameter model, and a maximum RMS of 12 cm (on Pico) and a minimum of 2.1 cm (on Faial) were determined. As a result of persistent volcanic and tectonic activity on most of the Azores islands, this geoid residual standard deviation must not be viewed as purely geoid error but containing, in addition, levelling and GPS position errors and vertical displacement. The effect on geoid accuracy of the digital terrain model resolution, of the spatial density of gravity data, and of the mass density was evaluated and two important conclusions were derived. First, the digital terrain model resolution has a clear effect on the geoid accuracy, with a maximum RMS of 3.4 cm on S. Miguel. Second, the mass density model does not affect the accuracy of the geoid. This second result indicates that the effect of variable density Manuscript + tables + figuresPage 2 of 44 A c c e p t e d M a n u s c r i p t 2 models on geoid determination may apply only to extensive areas of high terrain and not to smaller topographic units such as single volcanoes. The high-precision gravity model and gravimetric geoid for Azores (AZGEOD07) generated in this study will allow the conversion of old orthometric heights to ellipsoidal heights at precisions useful for the monitoring of vertical deformation. The geoid will also have application to investigations of ocean circulation modulation and of dynamic processes of Earth's mantle.

show abstract

Estimating regional deformation from a combination of space and terrestrial geodetic data

Cited by 360 publications

References 25 publications

Plate kinematics in the western Pacific derived from geodetic observations

Plate kinematics in the western Pacific derived from geodetic observations

Integrated velocity field from ground and satellite geodetic techniques: application to Arenal volcano

Sensitivity analysis of the gravity geoid estimation: A case study on the Azores plateau

Contact Info

Product

Resources

About