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Acta Seismologica Sinica

, Volume 9, Issue 2, pp 223–234 | Cite as

On the physical model of earthquake precursor fields and the mechanism of precursors’ time-space distribution (III) — anomalies of seismicity and crustal deformation and their mechanisms when a strong earthquake is in preparation

  • Shi-Rong Mei
Article

Abstract

By studying the seismicity pattern before 37 earthquakes withM⩾6.0 in North China and the pattern of crustal deformation in the Capital Area from 1954 to 1992, some abnormal characteristics of these patterns before strong earthquakes have been extracted. A comparison has been made between the anomalies of these two kinds of patterns. From the results we can know the following. (1) Before a strong earthquake, the seismicity will strengthen and the crustal deformation rate will increase. (2) Several years before a strong earthquake, there will be seismic gaps and deformation gaps around the epicenter of the quake. (3) The dynamic parameters of patterns all show a decrease in information dimension. This means that the crustal deformation has become more and more localized with time and it gives an important indication showing that a strong earthquake is in preparation. At the end of the paper, the physical mechanisms of the abnormal patterns of seismicity and crustal deformation have been explained in a unified way in terms of the earthquake-generating model of a inhomogeneous strongbody in inhomogeneous media.

Key words

seismicity pattern crustal deformation field localization of deformation pattern dynamics information dimension 

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Copyright information

© Acta Seismologica Sinica 1996

Authors and Affiliations

  • Shi-Rong Mei
    • 1
  1. 1.Center for Analysis and PredictionState Seismological BureauBeijingChina

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