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Outline
Taking the March 28, 2025, MS7.9 earthquake in Myanmar as an example, this study systematically analyzes the coseismic displacement and the resulting permanent displacement of the earthquake using 1 Hz high-frequency observation data from 21 GNSS reference stations in Yunnan, China, near the epicenter, based on the precise point positioning ambiguity resolution (PPPAR) method. The results indicate that the mean standard deviations of multi-system GNSS before the earthquake in the N (north), E (east), and U (up) directions are 0.7 cm, 1.1 cm, and 2.0 cm, respectively, representing accuracy improvements of 36.3%, 15.4%, and 39.4% compared to single-system GNSS. After the earthquake, high-frequency GNSS near the epicenter can detect distinct coseismic displacement waveforms, with the YNRL station, closest to the epicenter, showing a maximum peak change of 10.0 cm in the N direction and 6.2 cm in the E direction. The earthquake magnitude in Myanmar, calculated based on GNSS coseismic displacement results, is MS7.8, which is generally consistent with the officially released magnitude of MS7.9. Additionally, calculations reveal that multiple GNSS stations exhibit significant permanent displacements due to the earthquake, with the maximum displacement exceeding 2.0 cm. This study provides reference and data support for the application of high-frequency GNSS in monitoring coseismic displacement and analyzing earthquake magnitudes.
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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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