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Published February 18, 2012 | Published + Supplemental Material
Journal Article Open

Multiscale InSAR Time Series (MInTS) analysis of surface deformation

Abstract

We present a new approach to extracting spatially and temporally continuous ground deformation fields from interferometric synthetic aperture radar (InSAR) data. We focus on unwrapped interferograms from a single viewing geometry, estimating ground deformation along the line-of-sight. Our approach is based on a wavelet decomposition in space and a general parametrization in time. We refer to this approach as MInTS (Multiscale InSAR Time Series). The wavelet decomposition efficiently deals with commonly seen spatial covariances in repeat-pass InSAR measurements, since the coefficients of the wavelets are essentially spatially uncorrelated. Our time-dependent parametrization is capable of capturing both recognized and unrecognized processes, and is not arbitrarily tied to the times of the SAR acquisitions. We estimate deformation in the wavelet-domain, using a cross-validated, regularized least squares inversion. We include a model-resolution-based regularization, in order to more heavily damp the model during periods of sparse SAR acquisitions, compared to during times of dense acquisitions. To illustrate the application of MInTS, we consider a catalog of 92 ERS and Envisat interferograms, spanning 16 years, in the Long Valley caldera, CA, region. MInTS analysis captures the ground deformation with high spatial density over the Long Valley region.

Additional Information

© 2012 American Geophysical Union. Received 29 July 2011; revised 12 December 2011; accepted 14 December 2011; published 18 February 2012. We thank the editor, Tom Parsons, and two anonymous reviewers. This work was partially supported by NASA grant NNX09AD25G to M.S.

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Published - Hetland2012p17539J_Geophys_Res-Sol_Ea.pdf

Supplemental Material - 2011jb008731-fs01.pdf

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