Full
Outline
Using GNSS observation data of Chinese mainland from 1996 to 2016, we invert the current slip rates of active faults around Longxi block based on elastic block model. Combined with the historical earthquake catalog, we calculate the seismic moment deficit of each fault and analyze the spatial distribution of seismic b-value in Longxi block and its surrounding regions to assess seismic risk. The results show that the Haiyuan fault zone exhibits high-rate left-lateral strike-slip motion with a compression component, while the Liupanshan fault zone is dominated by crustal shortening and compression with a strike-slip component in both its northern and southern segments. The northern margin of western Qinling fault zone is primarily characterized by left-lateral strike-slip motion, with an extensional component in its western segment and a compression component in its eastern segment. In terms of seismic risk, significant seismic moment deficits have accumulated in the arcuate tectonic region where the Hasishan-Machangshan segment of Haiyuan fault zone meets the northern segment of Liupanshan fault zone. Meanwhile, the Jinqianghe, Maomaoshan, and Laohushan faults within the Tianzhu seismic gap show rapid stress accumulation and high seismic moment deficits. The Maxianshan fault zone exhibits high compression slip rate and a low b-value, indicating high stress accumulation. Additionally, the Zhuanglanghe fault zone has a substantial seismic moment deficit. These fault zones all possess the potential to generate moderate-to-strong earthquakes.
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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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