Newly Discovered NE-Striking Dextral Strike-Slip Holocene Active Caimashui Fault in the Central Part of the Sichuan-Yunnan Block and Its Tectonic Significance
Abstract
:1. Introduction
2. Regional Tectonic Setting
3. Methods
3.1. Remote Sensing Interpretation
3.2. UAV Measurement
3.3. Trench
3.4. Quaternary Dating
4. Results
4.1. Google Earth Image Interpretation
4.2. The Activity of the Caimashui Fault
4.2.1. Trench Location and Landforms
4.2.2. Stratigraphy
4.2.3. Description of the Trench
5. Discussion
5.1. Slip Rate of the Caimashui Fault
5.2. Potential Seismic Hazard for the Caimashui Fault
5.3. Faulting Pattern and Deformation Features
6. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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ID | Lab No. | Radiocarbon Age (a BP) | Correction Age (cal B.P.) | Description |
---|---|---|---|---|
LSZXCC-TC1-14C-01 | 598698 | 7940 ± 30 | 8815–8640 | Organic sediment |
LSZXCC-TC1-14C-02 | 598699 | 3260 ± 30 | 3562–3441 | Organic sediment |
LSZXCC-TC1-14C-03 | 598700 | 17,850 ± 50 | 21,916–21,428 | Organic sediment |
LSZXCC-TC1-14C-04 | 598701 | 26,790 ± 100 | 31,155–30,885 | Organic sediment |
LSZXCC-TC1-14C-05 | 598702 | 5240 ± 30 | 6020–5920 | Organic sediment |
LSZXCC-TC1-14C-06 | 598703 | 10,130 ± 30 | 11,882–11,611 | Organic sediment |
LSZXCC-TC1-14C-07 | 612196 | 4150 ± 30 | 4825–4575 | Organic sediment |
LSZXCC-TC1-14C-08 | 612197 | 7630 ± 30 | 8463–8371 | Organic sediment |
Unit No. | Description |
---|---|
Unit1 | Black peat layer, with a gravel content of approximately 10%, well sorted and poorly rounded. Most gravels are 3–4 cm in diameter. The top of the layer has a vertical drop of approximately 1.7 m on both sides of the fault F1. |
Unit2 | Light yellow clay layer with a small amount of gravel, approximately 5–7%. The gravel is well sorted and moderately rounded. The layer contains some small pieces of grayish-white clay, approximately 15%. The top of the layer has a vertical drop of approximately 1.5–1.6 m on both sides of the fault F1. |
Unit3 | Orange-red clay layer with a gravel content of approximately 20–30%. The gravel size is mostly 0.5–1 cm. The gravels are better sorted and poorly rounded. |
Unit5 | Brown topsoil layer with plant roots. |
Unit6 | Brick red clay layer with a small amount of gravel. The layer forms a colluvial wedge with pre-scarp deposits. |
Unit7 | Brick red clay layer, uniform in lithology and color, without gravel and stratification. |
Unit8 | Orange fault zone with approximately 5 mm wide white faulted mud. The southern boundary is clearer, while the northern boundary is blurred. |
Unit No. | Description |
---|---|
Unit1 | Black peat layer with high carbon content, deposited by a sag pond. Most gravels are 0.5–1 cm in diameter, black in color, well sorted, and poorly rounded. |
Unit2 | Light yellow and grayish-white clay layer with less than 10% gravel content. The clay has a patterned appearance, with the trench being yellowish on the northern side and whitish on the southern side. |
Unit3 | Orange gravel layer with orange clay. Most gravels are 0.5–1 cm in diameter, and the gravel content is approximately 40%. The gravels are slightly reddish, well sorted, and poorly rounded, with mostly orange clay as the filler. This layer may be an accumulation in front of the wedge. |
Unit4 | Purplish-red clay layer, slightly black, accumulated in front of the wedge of F2. |
Unit5 | Purplish-red clay layer, slightly black and purplish. |
Unit7 | Brick red clay layer with almost no gravel and stratification, representing recent deposits. |
Unit8 | Orange clay layer in the deformation zone of F1, affected by fault activity, with a messy accumulation. Both sides of the layer are black peat, while the middle part consists mostly of grayish-yellow clay mud, likely rolled up by fault activity. |
No. | Formula | Applicable Area | Calculated Seismic Magnitude | Source |
---|---|---|---|---|
1 | M = 5.16 + 1.12lgL | Worldwide | 7.04 | Wells and Coppersmith [77] |
2 | M = 5.92 + 0.88lgL | Tibet Plateau | 7.47 | Deng [78] |
3 | M = 5.303 + 1.181lgL | West China | 7.38 | Ran [79] |
4 | M = 6.2078 + 0.715lgL | West China | 7.47 | Huang [80] |
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Tan, X.; Liang, K.; Ma, B.; He, Z. Newly Discovered NE-Striking Dextral Strike-Slip Holocene Active Caimashui Fault in the Central Part of the Sichuan-Yunnan Block and Its Tectonic Significance. Remote Sens. 2024, 16, 3203. https://doi.org/10.3390/rs16173203
Tan X, Liang K, Ma B, He Z. Newly Discovered NE-Striking Dextral Strike-Slip Holocene Active Caimashui Fault in the Central Part of the Sichuan-Yunnan Block and Its Tectonic Significance. Remote Sensing. 2024; 16(17):3203. https://doi.org/10.3390/rs16173203
Chicago/Turabian StyleTan, Xin, Kuan Liang, Baoqi Ma, and Zhongtai He. 2024. "Newly Discovered NE-Striking Dextral Strike-Slip Holocene Active Caimashui Fault in the Central Part of the Sichuan-Yunnan Block and Its Tectonic Significance" Remote Sensing 16, no. 17: 3203. https://doi.org/10.3390/rs16173203