Abstract
The abundant data of focal mechanism solutions in Tangshan region, China, are inverted for the tectonic stress field. Combined with tectonophysical consideration, the magnitude of the three principal stresses, as well as their vertical variation under the average crustal rock property, in the source region of the 1976 Tangshan earthquake is estimated. The relationship between crustal stress and friction μ c, pore pressure P 0 and stress shape factor Φ is studied. The paper draws the conclusion that the vertical increasing rate of the maximum principal stress σ is directly proportional to friction, and inversely to pore pressure P 0 and stress shape factor Φ; while the vertical increasing rate of the minimum principal tress σ is directly proportional to pore pressure P 0, inversely to friction μ c and stress shape factor Φ. This study is a try to invert the data of focal mechanism solutions for the complete stress tensor.
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Foundation item: The MOST under contract number 95-S-05 and Joint Seismological Science Foundation of China (199022).
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Jian-tao, Z., Cui, Xf. & Xie, Fr. Preliminary analysis on the tectonic stress level in the source region of Tangshan earthquake. Acta Seimol. Sin. 15, 285–293 (2002). https://doi.org/10.1007/s11589-002-0061-7
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DOI: https://doi.org/10.1007/s11589-002-0061-7