Similarity of two Liyang earthquakes |
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| Authors: | Xu Shaoxie Liu Yufen |
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| Institution: | (1) Institute of Geophysics, State Seismological Bureau, Beijing, China |
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| Abstract: | Two moderate earthquakes of magnitudesM
s=5.5 and 6.0 occurred in 1974 and 1979, respectively, in the Liyang region, Jiangsu Province, China. The distance between the two epicenters is less than 20 km and their source mechanisms are very similar. In comparing these two earthquakes, we notice that the similarity of coseismic effects is consistent with a scaling law. The isoseismals of the two earthquakes resemble each other in overall shape but the difference of intensity between pairs of coincident isoseismals is one degree. The precursory seismicity patterns of the two events, such as seismic gaps and preshock swarms, are similar, but do not scale to magnitudes of mainshock. The latter phenomenon may reflect the regional tectonic structure, assuming the entire region to be subjected to the same stress. |
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| Keywords: | Seismicity Patterns Seismic Gap Precursor |
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