Full
DONG Chunli, senior engineer, majors in earthquake cataloging and digital earthquake application, E-mail:nzy2001@126.com
Outline
This article collected seismic waveform data for events of magnitude ML≥2.0 in Changzhi, Shanxi province, and its surrounding areas since 2009. The focal mechanisms of these events were determined using the Snoke first motion polarity and amplitude ratio method. Ultimately, 42 focal mechanisms were obtained for natural earthquakes with ML≥2.4 and RMS≤ 0.45, alongside 6 for non-natural earthquakes. The results indicate that the focal mechanisms of natural earthquakes in the study area are predominantly strike-slip and normal strike-slip, primarily influenced by NEE-SWW compression and NNW-SSE extension. The Changzhi basin exhibits a complex and unique local stress field characterized by a nearly NS-oriented T-axes direction. The P-axes along the Wenwangshan fault follow an NEE-SWW orientation, while in other regions, NE-SW is the dominant direction, showing good consistency in fault plane solutions and high dip angles. The study also explores the focal mechanisms of non-natural earthquakes in the region. Mining-induced earthquakes are mostly normal faulting, while collapse events are reverse faulting. The stress axis characteristics of these non-natural events exhibit significant deviations, with the P-axes or T-axes showing large rotations and the angles between the two axes are about 180°, which is distinctly different from the natural earthquakes where the P-axis/T-axis are nearly perpendicular. These features can assist in distinguishing between different types of 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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