Publications related to the GRACE Missions (no abstracts)

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Mobility, Thickness, and Hydraulic Diffusivity of the Slow-Moving Monroe Landslide in California Revealed by L-Band Satellite Radar Interferometry

Hu, Xie, Bürgmann, Roland, Lu, Zhong, Handwerger, Alexander L., Wang, Teng, and Miao, Runze, 2019. Mobility, Thickness, and Hydraulic Diffusivity of the Slow-Moving Monroe Landslide in California Revealed by L-Band Satellite Radar Interferometry. Journal of Geophysical Research (Solid Earth), 124(7):7504–7518, doi:10.1029/2019jb017560.

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@ARTICLE{2019JGRB..124.7504H,
       author = {{Hu}, Xie and {B{\"u}rgmann}, Roland and {Lu}, Zhong and {Handwerger}, Alexander L. and {Wang}, Teng and {Miao}, Runze},
        title = "{Mobility, Thickness, and Hydraulic Diffusivity of the Slow-Moving Monroe Landslide in California Revealed by L-Band Satellite Radar Interferometry}",
      journal = {Journal of Geophysical Research (Solid Earth)},
     keywords = {space and planetary science, earth and planetary sciences (miscellaneous), geochemistry and petrology, geophysics},
         year = 2019,
        month = jul,
       volume = {124},
       number = {7},
        pages = {7504-7518},
     abstract = "{GRACE satellites have detected regional-scale preseismic, coseismic, and
        postseismic gravity changes associated with great earthquakes
        during the GRACE era (2002-2017). Earthquakes also excite
        global-scale transient gravity changes associated with free
        oscillations that may be discerned for a few days. In this
        study, we examine such global gravity changes due to Earth's
        free oscillations and quantify how they affect GRACE
        measurements. We employ the normal mode formalism to synthesize
        the global gravity changes after the 2004 Sumatra earthquake and
        simulate the (gravitational) free oscillation signals manifested
        in the GRACE K-band ranging (KBR) measurements. Using the Kaula
        orbit perturbation theory, we show how GRACE inter-satellite
        distances are perturbed through a complex coupling of
        eigenfrequencies of the normal modes with the Earth's rotation
        rate and the GRACE satellites' orbital frequency. It is found
        that a few gravest normal modes can generate range-rate
        perturbations as large as 0.2 {\ensuremath{\mu}} m/s, which are
        comparable to actual errors of GRACE KBR ranging and
        accelerometer instruments. Wavelet time-frequency analysis of
        the GRACE KBR residual data in December 2004 reveals the
        existence of a significant transient signal after the 2004
        Sumatra earthquake. This transient signal is characterized by a
        frequency of \raisebox{-0.5ex}\textasciitilde0.022 mHz that
        could be potentially associated with the largest excitation due
        to the ``football'' mode of the Earth's free oscillation.
        However, the results are also affected by low-frequency noise of
        the GRACE accelerometers. Improved space-borne gravitational
        instrumentation may open new opportunities to study the Earth's
        interior and earthquakes independently from global seismological
        analysis.}",
          doi = {10.1029/2019jb017560},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2019JGRB..124.7504H},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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