Full
YAN Donghan, engineer, majors in seismic geology and geodesy, E-mail: yandonghan@yeah.net
Outline
To study the surface deformation caused by the 2020 Changbai mountain Tianchi volcanic swarm event, GNSS data from the Tianchi volcanic area were processed, treating GNSS observation points as SBAS-InSAR orbit refinement points. The results from GNSS and SAR data processing were compared and analyzed to obtain the deformation velocity field of Changbai mountain Tianchi volcano. The results show that the deformation near the Tianchi volcanic crater is significant, characterized by expansion and uplift near the crater and slow subsidence in the surrounding areas. Before 2022, the Tianchi volcanic area experienced large-scale uplift, presumably due to the sudden large-scale movement of underground fluids. After 2022, the deformation and deformation rate at the volcanic crater decreased. Specifically, the surface uplift in the north and southeast directions of the Tianchi volcanic crater is more pronounced, while there is a small area of subsidence in the northeast direction. The maximum deformation rate in the northwest direction is -12 mm/a, and in the southeast direction, it is 6.9 mm/a. The results of trend analysis indicate that the eastern and southwestern parts of Tianchi volcano may continue to contract, and the expansion trends of the northern and southern slopes have weakened, with the overall deformation rate being 10 to 14 mm/a lower than before 2023. This suggests that after the swarm event, the overall volcanic activity is weakening.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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