Full
TU Xianxin, engineer, majors in earthquake monitoring and prediction, E-mail: tuxianxin621@foxmail.com
Outline
We select the hourly data of two components of extensometer at Yichang station from 2013 to 2023, calculate the M2 wave tidal factors of the two components, perform variational mode decomposition(VMD) on them, and compute the power spectral density(PSD) for each decomposition results. Based on this, a Hilbert time-frequency analysis is conducted. The results show that NS component contains information with a frequency of 0.002 7/d, which may be related to the annual variation of water level in the Three Gorges reservoir(with a frequency of 0.002 7/d) and the current geological stress state. The EW component contains information with a frequency of 0.004-0.012/d, which may be related to the rapid changes of water level during the flood season in Three Gorges reservoir(with frequencies of 0.004-0.007/d and 0.010-0.013/d). Combining the VMD decomposition results of tidal factors and earthquake events with magnitude above 4.0 within 200 km of Yichang station, abnormal high value is observed in the detailed information of EW component tidal factor before the Badong M5.1 earthquake in 2013. Additionally, in terms of meteorological factors, the tidal factors do not exhibit a regular annual variation similar to temperature. However, trend changes in air temperature lead to cave temperature changes, which has a certain impact on the variation trend of tidal factors.
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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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