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Outline
Taking the 2021 Horqin MS4.7 earthquake as a case study, this paper uses the Biot-Savart law and the Monte-Carlo method, and employs the abnormal amplitude of the anti-phase geomagnetic vertical component at observation stations to invert and locate the information of these earthquake-induced currents. It reveals the temporal and spatial evolution characteristics of the induced currents related to the pre-earthquake geomagnetic anti-phase anomalies, as well as their correlations and influences with seismogenic structures and nearby/far-field earthquakes in the surrounding areas. Spatial distribution of induced currents: 1)The distribution trend of the peak value of induced currents is similar to the nature of the seismogenic fault. 2)Conjugate-shaped induced currents appear before the earthquake. Temporal sequence analysis of induced current depth: 1)The depth of induced currents during the earthquake occurrence period is very close to the focal depth. 2)As the earthquake approaches in time, the first-order difference of the shallowest depth of induced currents shows a convergent trend. 3)Surrounding earthquake events can cause the phenomenon of "shrinking before the earthquake and increasing after the earthquake" in the maximum depth of induced currents.This study represents a new attempt in the application of the electromagnetic discipline to the location of earthquake precursor anomalies, and provides new ideas for the short-term and imminent earthquake prediction methods based on electromagnetic anomalies.
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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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