Victoria Land, Antarctica: An Improved Geodynamic Interpretation Based on the Strain Rate Field of the Current Crustal Motion and Moho Depth Model
<p>(<b>A</b>) Geographical distribution of the Global Navigation Satellite Systems (GNSS) stations used for estimating the Eulerian Pole (VLNDEF18), [<a href="#B14-remotesensing-13-00087" class="html-bibr">14</a>], 95 of which are in Antarctica. Victoria Land (VL), the object of this study, is represented in a black frame, bottom-right inset. Yellow triangles identify the International GNSS Service (IGS) stations adopted to frame the network within the ITRF14 datum; IGS, POLENET, and VLNDEF GNSS stations are respectively represented by purple diamonds, red and cyan circles; blue and orange stars in the bottom of the figure show VLNDEF18 and VLNDEF20 (proposed in this work) Euler poles. (<b>B</b>) Map of VL shows the 36 GNSS stations used in this work and the location of the gravimetric data collected during the last 20 years within the PNRA projects. Yellow circles identify the locations of terrestrial gravimetric measurements; yellow polylines show the tracks of shipborne gravimetric data acquisition; red and cyan circles identify POLENET, and VLNDEF GNSS stations.</p> "> Figure 2
<p>The difference between the relative velocities of the GNSS stations obtained using VLNDEF18 Euler pole and those obtained using the VLNDEF20 pole. Significant vectors are highlighted in red according to the ±σ criterion; blue star in the middle of the figure identifies the Euler pole of the differences.</p> "> Figure 3
<p>Dilatation rate field computed for Victoria Land. Red and blue colors indicate, respectively, extension or compression statistically significant values at 1σ. Blanked grid cells correspond to area with statistically not significant values.</p> "> Figure 4
<p>Maximum shear strain rates of Victoria Land. Green lines depict the directions of maximum right lateral shear values while yellow to black colors show the magnitude of statistically significant values at 1σ. Blanked grid cells correspond to area with statistically not significant values.</p> "> Figure 5
<p>The estimated Moho depth in the Ross -TAM region derived from the inversion of gravity data and known Moho depth from the combined dataset of Pappa et al. [<a href="#B26-remotesensing-13-00087" class="html-bibr">26</a>]. The gravity disturbance used in the computation is upward continued to a reference height of 50 km.</p> "> Figure 6
<p>Difference between two Moho depth estimates assuming 30 km and 50 km for the reference height of the gravity disturbance upward continuation.</p> "> Figure 7
<p>Geodynamic framework of VL region and its surroundings, characterized by four blocks with homogeneous geodetic and geophysical characteristics. The blocks are: the Southern Ocean to North (pink), the Ross Sea to the E (cyan), the Wilkes Basin to the W (green), and VL in between (orange).</p> ">
Abstract
:1. Introduction
2. GNSS and Gravimetric Data
2.1. GNSS Dataset
2.2. Gravimetric Dataset
3. Strain Map Rate from GNSS Observations
4. Computation of the Moho Depths from Gravimetric Data
5. Discussion
6. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Model | NS (a) | ωx (mas yr−1) | ωy (mas yr−1) | ωz (mas yr−1) | ω (° Myr−1) | Lon (°) | Lat (°) |
---|---|---|---|---|---|---|---|
VLNDEF18 | 95 | −0.260 | −0.325 | 0.638 | 0.212 | 51.4018 | 56.8956 |
±0.005 | ±0.004 | ±0.016 | ±0.004 | 0.6815 | 0.6290 | ||
VLNDEF20 | 36 | −0.217 | −0.339 | 0.798 | 0.248 | 57.3652 | 63.2239 |
±0.012 | ±0.004 | ±0.039 | ±0.009 | 1.6439 | 0.9491 |
ID | Lon (°) | Lat (°) | H (m) | Ve | ±σe | Vn | ±σn |
---|---|---|---|---|---|---|---|
TNB1 | 164.1029 | −74.6988 | 72.24947 | 0.03 | 0.06 | −0.18 | 0.06 |
VL01 | 169.7251 | −72.4501 | 596.904 | 0.15 | 0.05 | −0.19 | 0.07 |
VL02 | 167.3781 | −72.5649 | 2047.183 | 0.24 | 0.05 | 1.00 | 0.06 |
VL03 | 162.9264 | −72.9505 | 2469.591 | 0.57 | 0.05 | −0.01 | 0.06 |
VL04 | 169.7487 | −73.5182 | 1834.54 | 0.26 | 0.05 | −0.39 | 0.07 |
VL05 | 169.6122 | −73.0631 | 478.4783 | 0.11 | 0.05 | 0.12 | 0.07 |
VL06 | 164.6907 | −74.35 | 2671.024 | 0.18 | 0.06 | −0.12 | 0.06 |
VL07 | 165.3793 | −73.7599 | 2039.205 | −0.70 | 0.05 | 0.04 | 0.06 |
VL08 | 163.7395 | −73.7643 | 2655.37 | 0.23 | 0.05 | 0.04 | 0.06 |
VL09 | 162.1694 | −73.3308 | 2270.461 | −0.02 | 0.05 | 0.14 | 0.06 |
VL10 | 162.7686 | −73.6885 | 2619.389 | −0.30 | 0.05 | 0.10 | 0.06 |
VL11 | 162.5417 | −74.3714 | 2362.313 | 0.02 | 0.06 | 0.52 | 0.06 |
VL12 | 163.727 | −72.2744 | 1932.967 | 0.05 | 0.05 | −0.86 | 0.06 |
VL13 | 162.205 | −74.8478 | 1460.353 | −0.33 | 0.06 | 0.43 | 0.06 |
VL14 | 165.9057 | −73.2282 | 2084.013 | 0.39 | 0.05 | −0.20 | 0.06 |
VL15 | 163.7157 | −74.9343 | −28.0657 | −0.40 | 0.06 | −0.06 | 0.06 |
VL16 | 162.5455 | −75.2326 | 311.3152 | 0.66 | 0.07 | −0.39 | 0.06 |
VL17 | 161.5387 | −75.0951 | 683.5092 | −0.49 | 0.07 | 0.17 | 0.06 |
VL18 | 162.5937 | −75.8985 | 58.0139 | −0.08 | 0.08 | 0.11 | 0.06 |
VL19 | 161.7816 | −75.805 | 809.8439 | −0.25 | 0.08 | 0.26 | 0.06 |
VL21 | 163.7329 | −71.6687 | 1899.384 | −2.69 | 0.06 | 0.24 | 0.06 |
VL22 | 162.0404 | −71.4219 | 274.8542 | −0.15 | 0.06 | −0.06 | 0.06 |
VL23 | 170.3047 | −71.3458 | 1118.984 | 0.11 | 0.06 | 0.16 | 0.07 |
VL29 | 163.8963 | −71.1541 | 1624.468 | −0.02 | 0.07 | 0.03 | 0.06 |
VL30 | 162.5251 | −70.5987 | 1491.51 | −0.67 | 0.07 | −0.59 | 0.06 |
VL32 | 166.1646 | −71.7331 | 1784.029 | 0.66 | 0.06 | −0.72 | 0.06 |
VLHG | 162.2017 | −75.398 | 165.6562 | −0.10 | 0.07 | −0.17 | 0.06 |
BRIP | 158.4691 | −75.7957 | 2110.894 | −0.08 | 0.08 | −0.38 | 0.07 |
BURI | 155.8942 | −79.1474 | 2006.296 | −0.36 | 0.14 | −0.49 | 0.08 |
COTE | 161.9978 | −77.8059 | 1878.372 | 0.42 | 0.11 | 0.05 | 0.06 |
FIE0 | 168.4235 | −76.1446 | 153.8106 | 0.45 | 0.08 | 0.52 | 0.06 |
FLM5 | 160.2714 | −77.5327 | 1869.704 | −0.34 | 0.11 | −0.07 | 0.06 |
FTP4 | 162.5647 | −78.9277 | 243.185 | −0.14 | 0.14 | 0.01 | 0.06 |
MCM4 | 166.6693 | −77.8384 | 97.97845 | 0.18 | 0.12 | −0.15 | 0.06 |
MIN0 | 167.1638 | −78.6503 | 676.8787 | −0.19 | 0.13 | 0.41 | 0.06 |
ROB4 | 163.1901 | −77.0344 | −41.6182 | 0.46 | 0.10 | −0.32 | 0.06 |
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Zanutta, A.; Negusini, M.; Vittuari, L.; Martelli, L.; Cianfarra, P.; Salvini, F.; Mancini, F.; Sterzai, P.; Creati, N.; Dubbini, M.; et al. Victoria Land, Antarctica: An Improved Geodynamic Interpretation Based on the Strain Rate Field of the Current Crustal Motion and Moho Depth Model. Remote Sens. 2021, 13, 87. https://doi.org/10.3390/rs13010087
Zanutta A, Negusini M, Vittuari L, Martelli L, Cianfarra P, Salvini F, Mancini F, Sterzai P, Creati N, Dubbini M, et al. Victoria Land, Antarctica: An Improved Geodynamic Interpretation Based on the Strain Rate Field of the Current Crustal Motion and Moho Depth Model. Remote Sensing. 2021; 13(1):87. https://doi.org/10.3390/rs13010087
Chicago/Turabian StyleZanutta, Antonio, Monia Negusini, Luca Vittuari, Leonardo Martelli, Paola Cianfarra, Francesco Salvini, Francesco Mancini, Paolo Sterzai, Nicola Creati, Marco Dubbini, and et al. 2021. "Victoria Land, Antarctica: An Improved Geodynamic Interpretation Based on the Strain Rate Field of the Current Crustal Motion and Moho Depth Model" Remote Sensing 13, no. 1: 87. https://doi.org/10.3390/rs13010087