华东地区钻孔体应变对飑线天气过程响应的特征与机制

doi:10.12196/j.issn.1000-3274.2021.04.014

Abstract

Abstract: On 4 March 2018, a southwest-northeast-oriented squall line was observed propagating across East China, which caused disaster during its evolution. The main object of this work is to systematically reveal the characteristics of the squall line in strainmeter measurements, and to improve our understanding of atmospheric loading signals in strainmeter records during the passage of the mesoscale convective system. Combined with the doppler radar, atmospheric pressure and outdoor temperature observations, we analyze the responses of volumetric strain with 1-minute resolution to the strong squall line recorded at Nanchang, Huangshan, Huzhou, and Daishan stations. The results show that: ① The short-period jump in the atmospheric pressure caused by the squall line is the main dominating driving force for the pressure-induced volumetric strain, the maximum magnitude is about 16.2×10^-9 on strain records. ② It is also observed the relationship between the fluctuations of atmospheric pressure and the compressive strains as for the magnitudes for the above-mentioned stations show a good linear variations. And the observed fluctuations with a periodicities ranging from 26 to 74 minutes are almost consistent between the atmospheric pressure and volumetric strain. Moreover, the atmospheric pressure coefficient of volumetric strain can reach up to 5.0×10^-9/hPa. ③ All the stations can respond well to the squall line. Furthermore, the evolution process and propagating pattern of the spatiotemporal and intensity variations for the squall line can be revealed clearly by multi-station records. The results could lead to reasonably uncover the physical origin of anomalous volumetric strain changes recorded at single-and/or multi-station. Meanwhile, the results can also contribute to providing the crucial observational evidences for atmospheric loading model in short period aiming to correct barometric effect precisely.

Key words: Squall line, Convective weather, Atmospheric pressure, Borehole volumetric strain, East China

CLC Number:

P315.7

YANG Xiao-lin, YANG Jin-ling. Characteristics and Mechanism of Borehole Strainmeter in Response to a Squall Line in East China[J]. EARTHQUAKE, 2021, 41(4): 180-191.

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Characteristics and Mechanism of Borehole Strainmeter in Response to a Squall Line in East China

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