Enhanced Surface Imaging of Crustal Deformation

Haines, A. J.; Dimitrova, L. L.; Wallace, L. M.; Williams, Charles A.

doi:10.1007/978-3-319-21578-5

Cited by 21 publications

(40 citation statements)

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“…Such a complex tectonic setting results in a complex geodetic deformation field, with a myriad of possible deformation sources (e.g., Beavan & Haines, 2001;Hamling et al, 2015;Wallace et al, 2004Wallace et al, , 2007. To better resolve the locus of tectonic deformation in New Zealand, we implement the Haines et al (2015) method on the most recent version of the GPS horizontal velocity field (Beavan et al, 2016) ( Figure 1).…”

Section: Geophysical Research Lettersmentioning

confidence: 99%

“…In areas with lower rates of tectonic activity (e.g., Northland and the Waikato), site spacing increases to~50 km. Such a dense, high-quality velocity field is well suited to extracting VDoHS and high-precision strain rates using the Haines et al (2015) method.…”

Section: Deriving a New Zealand Strain And Vdohs Rate Field From Gps mentioning

confidence: 99%

“…The previous methods lack the constraints provided by including the physics of elastic behavior near the Earth surface, and to compensate have often been applied with strong damping, which results in highly smoothed strain rates, typically giving mismatches to the GPS data of~2 standard deviations or larger. We outline the fundamentals of the method below, although we refer the reader to Haines et al (2015), Dimitrova et al (2016), and Árnadóttir et al (2018) for more detail on application of the method to GPS velocity fields. An analytical approximation for the Haines et al (2015) method has been developed by Sandwell and Wessel (2016) to create gridded 2-D velocity fields in the gpsgridder algorithm in GMT.…”

Section: Deriving a New Zealand Strain And Vdohs Rate Field From Gps mentioning

confidence: 99%

“…We outline the fundamentals of the method below, although we refer the reader to Haines et al (2015), Dimitrova et al (2016), and Árnadóttir et al (2018) for more detail on application of the method to GPS velocity fields. An analytical approximation for the Haines et al (2015) method has been developed by Sandwell and Wessel (2016) to create gridded 2-D velocity fields in the gpsgridder algorithm in GMT.…”

Section: Deriving a New Zealand Strain And Vdohs Rate Field From Gps mentioning

confidence: 99%

“…Improved approaches to resolve the distribution of tectonic deformation in plate boundary zones are needed for geodetic data to play an important role in the assessment of seismic hazards, and even to highlight hidden or ill-characterized zones of deformation. Haines et al (2015) devised a novel method to invert GPS displacement fields for Vertical Derivatives of Horizontal Stress (VDoHS) rates, relying on elasticity theory and the horizontal force balance equations at the Earth's surface. VDoHS rates are essentially spatial derivatives of stress rates and, as such, are a more spatially compact surface expression of subsurface deformation than conventionally used strain rates, which are themselves a spatial derivative of displacement fields.…”

Section: Introductionmentioning

confidence: 99%

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New Zealand‐Wide Geodetic Strain Rates Using a Physics‐Based Approach

Haines

Wallace

2020

Geophysical Research Letters

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We present a new strain rate map for New Zealand, based on geodetic data acquired from 1995 to 2013. We use a physics‐based approach, which inverts the horizontal GPS velocities for Vertical Derivatives of Horizontal Stress (VDoHS) rates, relying on using elasticity theory and the horizontal force balance equations at the Earth's surface. The VDoHS rates are then integrated to obtain horizontal strain rates. Strain rates derived using this new approach are less spatially smoothed than previous results using conventional methods. In addition to the major plate boundary features in New Zealand, low‐rate zones of deformation are resolved by the strain and VDoHS rates, which bodes well for the utility of this method to reveal processes on hidden or ill‐characterized fault zones. Application of this new method to obtain strain and VDoHS rates provides the highest resolution view to‐date of contemporary deformation in New Zealand.

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Section: Geophysical Research Lettersmentioning

confidence: 99%

Section: Deriving a New Zealand Strain And Vdohs Rate Field From Gps mentioning

confidence: 99%

Section: Deriving a New Zealand Strain And Vdohs Rate Field From Gps mentioning

confidence: 99%

Section: Deriving a New Zealand Strain And Vdohs Rate Field From Gps mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New Zealand‐Wide Geodetic Strain Rates Using a Physics‐Based Approach

Haines

Wallace

2020

Geophysical Research Letters

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Moho depth and crustal thinning in the Marmara Sea region from gravity data inversion

et al. 2017

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The free‐air gravity in the Marmara Sea reveals that the low density of sedimentary basins is partly compensated in the lower crust. We compiled geophysical upper crust studies to determine the sediment basin geometries in and around the Marmara Sea and corrected the gravity signal from this upper crust geology with the Parker method. Then, assuming long wavelength anomalies in the residual gravity signal is caused by variations in the Moho topography, we inverted the residual to build the Moho topography. The result shows that the Moho is uplifted on an area greater than the Marmara Sea with a maximum crust thinning beneath the basins where the Moho is at about 25 km, 5 km above the reference depth. We then evaluated the Neogene extension by comparing the surface covered by our 3‐D thinned model with the surface covered by an unthinned model with same crustal volume. Comparing this surface with areal extension rate from GPS data, we found a good compatibility indicating that the extension rate averaged over the Sea of Marmara area probably remained close to its present‐day value during major changes of tectonic regime, as the incursion of the North Anatolian Fault system during the Pliocene leads to the establishment of the dominantly strike‐slip present‐day system. We also show that crustal extension is distributed over a wider domain in the lower crust than in the upper crust, and that this may be accounted for by a relatively minor component of lower crustal ductile flow.

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Interpolation of 2‐D vector data using constraints from elasticity

Sandwell

Wessel

2016

Geophysical Research Letters

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We present a method for interpolation of sparse two‐dimensional vector data. The method is based on the Green's functions of an elastic body subjected to in‐plane forces. This approach ensures elastic coupling between the two components of the interpolation. Users may adjust the coupling by varying Poisson's ratio. Smoothing can be achieved by ignoring the smallest eigenvalues in the matrix solution for the strengths of the unknown body forces. We demonstrate the method using irregularly distributed GPS velocities from southern California. Our technique has been implemented in both the Generic Mapping Tools and MATLAB®.

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Enhanced Surface Imaging of Crustal Deformation

Cited by 21 publications

References 0 publications

New Zealand‐Wide Geodetic Strain Rates Using a Physics‐Based Approach

New Zealand‐Wide Geodetic Strain Rates Using a Physics‐Based Approach

Moho depth and crustal thinning in the Marmara Sea region from gravity data inversion

Interpolation of 2‐D vector data using constraints from elasticity

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