Full
HE Tian, postgraduate, majors in GNSS precise data processing and present-day crustal deformation, E-mail: 2269566647@qq.com
Outline
We use BDS data from continuous GNSS stations of China seismic experiment site(CSES) and crustal movement observation network of China(CMONOC) to study the static and dynamics displacement fields of 2022 Luding MW6.6 earthquake. First, we employ the relative positioning method to process 30 s sampling data based on GAMIT/GLOBK software, and obtain daily solutions over the period of 8 days before and 6 days after the Luding earthquake. We extract co-seismic static displacements using the differences between average coordinates before and after the earthquake. The maximum displacement is determined at SYD5 site, about 39 km away from the epicenter, with 19.57±2.08 mm and 10.88±1.79 mm for EW and NS components, respectively. The displacements decrease with the increase of epicenter distance. The co-seismic displacements are less than 4 mm for stations more than 100 km far away from the epicenter. The static displacement field in spatial distribution shows a left-lateral slip characteristic. Then, we use PRIDE PPP-AR software and precise point positioning method to process 1 Hz data and obtain dynamic displacement waveforms for each station. We calculate static displacements using dynamics waveforms of 2 minutes before and after the earthquake. The results indicate that SYD5(Anshunchang), SYB1(Kangding), SYE0(Liziping) and SYD9(Mianning), relatively close to the epicenter, recorded prominent dynamic displacement waveforms, with dynamic displacement of EW component larger than that of NS component. The SYD5 and SYB1 sites which are closer to the epicenter show prominent static displacements, while the static displacements of other stations are not significant. Finally, a comparative analysis is conducted between the static displacements obtained from BDS and GPS data, which shows a good consistency between them. This study indicates that the Beidou system can clearly record the coseismic static displacement of moderate intensity earthquake occur in the CSES.
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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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