Abstract
In this paper, based on the results of tomographic image of Tangshan and **ngtai areas, the relations between the characteristics of the two strong earthquake sequences and their three-dimensional velocity structures are studied. The research results indicate that: (1) Mosaic distribution of low-velocity bodies and high-velocity bodies, especially the existence of high-velocity bodies with large size in crust are the common basis of development of the two earthquake sequences. (2) Scale, depth, and heterogeneity of high-velocity and low-velocity bodies are the important factors to effect the characteristic of earthquake sequences. (3) The depth of the high-velocity body in Tangshan area is less than that in **ngtai area, which is the principal reason why the dominant focal depth and the biggest focal depth of Tangshan earthquake sequence are less than **ngtai’s. (4) The depth of the high-velocity bodies in Ninghe area is more than that in Tangshan-Luanxian area, which lead to the biggest magnitude and epicentral intensity are lower. These results could be helpful for predicting the main shock of strong swarm-type earthquakes and later strong aftershocks.
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This project is supported by the Key Project from China Seismological Bureau under the Ninth Five-Year Plan (95-04-03-01-01).
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Mei, SR., Xue, Y. & Yin, JY. Relationship between the earthquake sequences of Tangshan and **ngtai and the three dimensional velocity structure. Acta Seimol. Sin. 12, 175–182 (1999). https://doi.org/10.1007/s11589-999-0022-5
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DOI: https://doi.org/10.1007/s11589-999-0022-5