Full
Outline
Based on the GNSS earth observation network system (GEONET) in Japan and the Taiwan geophysical network for seismology (TGNS) in China, this paper investigates the propagation characteristics of co-seismic ionospheric disturbance(CsIDs) triggered by the 1 January 2024 Noto Peninsula MW7.5 earthquake in Japan and the 2 April 2024 Hualien MW7.4 earthquake in Taiwan, China. Meanwhile, the reasons for the anisotropy of the CsIDs produced by the two earthquakes are discussed. The results show that: 1) For the Noto Peninsula earthquake, the seismically excited acoustic waves propagated to the height of the F2 layer of the ionosphere within 8 to 9 minutes, and the triggered CsIDs propagated to the southeast of the epicenter at a speed of ~0.89 km/s, with a maximum amplitude of 0.768 TECu. The 2-minute rate of TEC index (ROTI) maps show higher sensitivity than the 2D-filtered TEC maps. 2) The CsIDs of the Hualien earthquake were also excited by acoustic waves and reached the height of the F2 layer of the ionosphere after ~8 minutes, with a maximum amplitude close to 0.4 TECu. 3) The propagation direction of the CsIDs triggered by the Noto Peninsula earthquake was strongly linked to the geomagnetic field, whereas those triggered by the Hualien earthquake were influenced by both the source mechanism and the geomagnetic field.
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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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