Small Magnitude Co-Seismic Deformation of the 2017 Mw 6.4 Nyingchi Earthquake Revealed by InSAR Measurements with Atmospheric Correction
<p>Tectonic setting for the Mw 6.4 Nyingchi earthquake. Historic earthquakes recorded by the USGS database from January 1950 to October 2017 are plotted as blue dots, the main shock is indicated by a green star and aftershocks by red dots. Historic major events recorded by CEA are plotted by a beach ball (red for Mw > 6.0, and black for Mw < 6.0). The GPS velocity field (red arrows) is referenced from Liang et al. [<a href="#B29-remotesensing-10-00684" class="html-bibr">29</a>]. The event was covered by two pairs of Sentinel-1A images with different geometries (solid line boxes). The red solid line is the modeled fault plane projected on the Earth’s surface.</p> "> Figure 2
<p>InSAR observations and atmospheric corrections. (<b>a1</b>,<b>a2</b>) are raw interferograms. Method 1 (<b>b1</b>–<b>b4</b>) is HRES-ECMWF interpolated by the ITD model. Method 2 (<b>c1</b>–<b>c4</b>) removes signals correlated with elevation. Method 3 (<b>d1</b>–<b>d4</b>) is HRES-ECMWF interpolated bilinearly. Note the coverage is different from <a href="#remotesensing-10-00684-f001" class="html-fig">Figure 1</a> as the very far field data has been cut.</p> "> Figure 3
<p>Correlations between the observed phase and the modeled tropospheric corrections for the descending (<b>a</b>) and ascending (<b>b</b>) tracks, respectively. Each dot represents one pixel of the interferograms, the color scale corresponds to its elevation, and r is the correlation ratio.</p> "> Figure 4
<p>(<b>a</b>) Uncertainty analysis by Monte Carlo testing for the nonlinear inversion: standard deviation (red histograms) and trade-offs (scatter plots) between the model parameters. The vertical axes of the first column share the same scale with the bottom horizontal axes. The rest are observed observations (<b>b1</b>,<b>c1</b>), modeled displacement (<b>b2</b>,<b>c2</b>), and residuals (<b>b3</b>,<b>c3</b>).</p> "> Figure 5
<p>Fault plane slip distribution of the Nyingchi M6.4 earthquake; (<b>a</b>–<b>c</b>) are the slip RMS values by Monte Carlo testing along the strike and dip directions, respectively; (<b>d</b>) is the contour map of ABIC searching for the optimal smoothing factor and fault dip. The smoothing factor is represented as log(<span class="html-italic">α</span><sup>2</sup>) in Equation (1). The color bar indicates the data misfit RMS. The determined optimal values are 0.9 for <span class="html-italic">α</span><sup>2</sup>, and 59 for dip angle. The fault geometry is also illustrated with reference to the Jiali fault [<a href="#B6-remotesensing-10-00684" class="html-bibr">6</a>] and the Indian and Eurasian Plates.</p> "> Figure 6
<p>Checkerboard test for fault slip distribution using the modeled fault geometry and the down-sampled InSAR observation distributions.</p> "> Figure 7
<p>Coulomb stress changes of the Nyingchi Mw 6.4 earthquake calculated by the optimal fault plane slip distribution at the surface and at a depth of 8 km.</p> ">
Abstract
:1. Introduction
2. Tectonic Setting
3. Datasets and Error Mitigation
4. Co-Seismic Modelling and Results
5. Discussions
6. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Descending | Ascending | |
---|---|---|
Dates | 6 November 2017–18 November 2017 | 11 November 2017–23 November 2017 |
Acquisition time (UTC) | 23:37 | 11:41 |
Temporal Baseline (Days) | 12 | 12 |
Perpendicular Baseline (m) | 9.6 | 32.9 |
Raw Phase StdDev 1 (cm) | 1.83 | 1.47 |
StdDev after Method 1 2 (cm) | 0.73 | 0.80 |
StdDev after Method 2 3 (cm) | 1.13 | 0.93 |
StdDev after Method 3 4 (cm) | 1.28 | 0.99 |
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Yu, C.; Li, Z.; Chen, J.; Hu, J.-C. Small Magnitude Co-Seismic Deformation of the 2017 Mw 6.4 Nyingchi Earthquake Revealed by InSAR Measurements with Atmospheric Correction. Remote Sens. 2018, 10, 684. https://doi.org/10.3390/rs10050684
Yu C, Li Z, Chen J, Hu J-C. Small Magnitude Co-Seismic Deformation of the 2017 Mw 6.4 Nyingchi Earthquake Revealed by InSAR Measurements with Atmospheric Correction. Remote Sensing. 2018; 10(5):684. https://doi.org/10.3390/rs10050684
Chicago/Turabian StyleYu, Chen, Zhenhong Li, Jiajun Chen, and Jyr-Ching Hu. 2018. "Small Magnitude Co-Seismic Deformation of the 2017 Mw 6.4 Nyingchi Earthquake Revealed by InSAR Measurements with Atmospheric Correction" Remote Sensing 10, no. 5: 684. https://doi.org/10.3390/rs10050684