The 2024 Mw 7.1 Wushi Earthquake: A Thrust and Strike-Slip Event Unveiling the Seismic Mechanisms of the South Tian Shan’s Thick-Skin Tectonics
<p>Major Cenozoic faults in the Tianshan Zone and the tectonic setting of the 2024 Wushi earthquake. (<b>a</b>) The blue arrow indicates the GPS horizontal velocity field from [<a href="#B9-remotesensing-16-02937" class="html-bibr">9</a>]; the red arrow indicates the GPS horizontal velocity field from [<a href="#B10-remotesensing-16-02937" class="html-bibr">10</a>]; the thin black lines represent faults; the empty circles represent the locations of earthquakes with a magnitude of 6 or higher since 1900. (<b>b</b>) The red circular region delineates the area shown in (<b>a</b>); the gray circles represent the locations of strong earthquakes with a magnitude of 7 or higher since 1900 (data are from <a href="https://earthquake.usgs.gov/earthquakes/" target="_blank">https://earthquake.usgs.gov/earthquakes/</a>, accessed on 23 February 2024). (<b>c</b>) shows different organizations’ determined focal mechanism solutions and locations. (<b>d</b>) North–south structural diagram cross-section of the southern margin of the South Tian Shan. The light-blue line delineates the detachment fault. The red lines indicate the thrust faults of the southern margin of the South Tian Shan. Modified from [<a href="#B11-remotesensing-16-02937" class="html-bibr">11</a>,<a href="#B12-remotesensing-16-02937" class="html-bibr">12</a>]. The lemon chiffon area delineates thin skinned structure, medium purple area delineates thick skinned structure. Fault abbreviation: SNBF, the South Naryn Basin Fault; NNBF, the North Naryn Basin Fault; SIKF, the South Issyk-Kul Fault; PFF, the Pamir Frontal Thrust Fault; TFF, Talas-Fergana Fault; MDF, Maidan Fault; TSF, Toshgan Fault; KKSF, Kokesale Fault; NWSF the North Wensu Fault; KTF, Kepingtag Fault.</p> "> Figure 2
<p>Unwrapped InSAR deformation fields of the Wushi earthquake and aftershocks. (<b>a</b>,<b>b</b>) LOS deformation (cold colors indicate motion away from the satellite, while warm colors indicate motion towards the satellite). White lines denote of the surface trace of the seismogenic fault that we inferred. (<b>c</b>,<b>d</b>) Deformation profiles along A-A’ and B-B’ in (<b>a</b>,<b>b</b>). (<b>e</b>,<b>f</b>) InSAR deformation fields of aftershocks. The blue circles represent precise locations of aftershocks with depths less than 10 km and magnitudes greater than M4.5 between 24 January 2024 and 7 February 2024. The size of the circles corresponds to the magnitude of the aftershocks. Data source: <a href="https://data.earthquake.cn/gxdt/info/2024/334671642.html" target="_blank">https://data.earthquake.cn/gxdt/info/2024/334671642.html</a>, (accessed on 12 March 2024). (<b>e</b>) Ascending track 56, time interval 20240125_20240207. (<b>f</b>) Descending track 34, time interval 20240124_20240206.</p> "> Figure 3
<p>Marginal posterior probability distributions for the fault model parameters for the Wushi earthquake. Red lines represent the maximum a posteriori probability solution (cold colors for low frequency, warm colors for high frequency).</p> "> Figure 4
<p>Slip distribution model and deformation and residuals predicted of the Wushi Mw7.1 earthquake. (<b>a</b>) 3D display and (<b>b</b>) 2D display, arrows indicate the slip direction of the hanging wall relative to the footwall. (<b>c</b>,<b>f</b>) represent the observed values of ascending track 56 and descending track 34 after downsampling; (<b>d</b>,<b>g</b>) represent the predicted values; (<b>e</b>,<b>h</b>) represent the residual values. The red solid line indicates the determined trace of seismogenic fault.</p> "> Figure 5
<p>Estimated slip distribution and predicted deformation of the aftershocks. (<b>a</b>) A three-dimensional visualization showcasing the slip distribution of two faults. Red circles depict aftershock events occurring during the SAR imagery acquisition period. (<b>b</b>,<b>c</b>) Two-dimensional representations of the same slip distribution for enhanced clarity. (<b>d</b>–<b>f</b>) Observed deformation, simulated deformation, and residual errors derived from ascending track T56, respectively. (<b>g</b>–<b>i</b>) Similarly, the observed deformation, simulated deformation, and residual errors for descending track T34 are presented in sequence. The thin blue lines represent the seismogenic fault of the Wushi Mw 7.1 earthquake. The red solid line indicates the surface trace of f1 and f2 faults.</p> "> Figure 6
<p>(<b>a</b>) Coulomb stress triggering and (<b>b</b>) source structure locations of the main shock–aftershock sequence of the Wushi earthquake. (<b>a</b>) Changes in positive Coulomb stress (depicted in red) on the fault plane indicate proximity to failure and sliding hazard, while negative values (depicted in blue) signify a lack of sliding hazard. (<b>b</b>) The black lines represent the fault locations delineated based on the inversion of fault geometry parameters and geological cross-section base map (adapted from [<a href="#B27-remotesensing-16-02937" class="html-bibr">27</a>]). The red lines depict faults, the black line segments represent the mainshock fault and the aftershock (f1) fault identified in this study. Shallow light yellow areas indicate reverse-thrust overlying strata.</p> ">
Abstract
:1. Introduction
2. InSAR Data and Processing
2.1. InSAR Deformation of the Mw7.1 Earthquake
2.2. InSAR Deformation of Aftershock
3. Fault Geometry and Slip Exploration
3.1. Fault Parameters Setting of the Mw7.1 Earthquake
3.2. Slip Distribution Inversion of the Mw7.1 Earthquake
3.3. Seismic Structures and Slip Distribution Inversion of the Aftershocks
4. Discussion
4.1. Seismogenic Structure of the Mw7.1 Wushi Earthquake
4.2. Deformation and Potential Seismic Structures of Aftershock
4.3. The Triggering Relationship of Main–Aftershocks
4.4. Seismicity of the Maidan Fault
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Agency | Location | Magnitude (Mw) | Depth (km) | Nodal Plane 1 Strike, Dip, Rake | Nodal Plane 2 Strike, Dip, Rake |
---|---|---|---|---|---|
GCMT * | 41.19°N 78.57°E | 7.0 | 14.0 | 236°, 48°, 47° | 110°, 57°, 127° |
NEIC | 41.269°N 78.649°E | 7.0 | 13.0 | 235°, 45°, 42° | 113°, 62°, 126° |
IPGP | 41.294°N 78.594°E | 7.1 | 22 | 234°, 50°, 51° | 105°, 53°, 127° |
CEA-IGP | 41.2938°N 78.5937°E | 7.1 | 27.4 | 250°, 42°, 59° | 109°, 55°, 115° |
GFZ | 41.28°N 78.73°E | 7.01 | 15 | 251°, 38°, 73° | 93°, 54°, 103° |
Direction | Track No. | Detection Time | Time Interval (Day) | Spatial Baseline (m) | Event | |
---|---|---|---|---|---|---|
Master | Slave | |||||
Asc | 56 | 14 January 2024 | 25 January 2024 | 12 | −35.9 | Main shock |
Des | 34 | 13 January 2024 | 24 January 2024 | 12 | −1.4 | |
Asc | 56 | 25 January 2024 | 7 February 2024 | 12 | 106.8 | Aftershock |
Des | 34 | 24 January 2024 | 6 February 2024 | 12 | −92.2 |
Model Param. | Optimal | Mean | Median | 2.5% | 97.5% |
---|---|---|---|---|---|
Fault Length | 83,783.7 | 83,721.4 | 83,783.4 | 82,694 | 84,815.7 |
Fault Width | 13,179 | 13,195.5 | 13,244.1 | 12,260.3 | 13,916.2 |
Fault Depth | 18,221.6 | 18,190.1 | 18,211.9 | 17,733.1 | 18,552.4 |
Fault Dip * | −59.8794 | −59.8732 | −59.8719 | −60.4573 | −59.2678 |
Fault Strike * | 49.1688 | 49.1993 | 49.1971 | 48.9167 | 49.4954 |
Fault StrSlip | −1.58574 | −1.58309 | −1.58101 | −1.65472 | −1.51888 |
Fault DipSlip | −1.94319 | −1.93905 | −1.93353 | −2.02938 | −1.86268 |
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Qiu, J.; Sun, J.; Ji, L. The 2024 Mw 7.1 Wushi Earthquake: A Thrust and Strike-Slip Event Unveiling the Seismic Mechanisms of the South Tian Shan’s Thick-Skin Tectonics. Remote Sens. 2024, 16, 2937. https://doi.org/10.3390/rs16162937
Qiu J, Sun J, Ji L. The 2024 Mw 7.1 Wushi Earthquake: A Thrust and Strike-Slip Event Unveiling the Seismic Mechanisms of the South Tian Shan’s Thick-Skin Tectonics. Remote Sensing. 2024; 16(16):2937. https://doi.org/10.3390/rs16162937
Chicago/Turabian StyleQiu, Jiangtao, Jianbao Sun, and Lingyun Ji. 2024. "The 2024 Mw 7.1 Wushi Earthquake: A Thrust and Strike-Slip Event Unveiling the Seismic Mechanisms of the South Tian Shan’s Thick-Skin Tectonics" Remote Sensing 16, no. 16: 2937. https://doi.org/10.3390/rs16162937