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大地震前的地震活动空白区现象,日益引起国内外地震工作者的重视。1976年唐山7.8级大震前的地震活动图象如何?有没有地震活动空白区?目前还没有完全统一的认识。 魏光兴等同志研究了唐山大震前90年M≥4(3/4)级地震后认为,唐山大震前地震活动没有空白区特征。邱群同志则认为,1973年12月后,唐山东南面有一个以2—4级地震围成的空区,这个空区分布在渤海里,与唐山大震的极震区和余震区并不重合,同时还可以找到若干类似的空区。
Earthquake before the earthquake blank area phenomenon, increasingly aroused the attention of earthquake workers at home and abroad. What is the image of the seismic activity before the MS7.8 Tangshan earthquake in 1976? Are there any blank areas for seismic activity? There is not yet a completely unified understanding. Wei Guangxing and other comrades studied the M ≥ 4 (3/4) earthquakes in the 90 years prior to the Tangshan earthquake and concluded that there is no blank area before the Tangshan earthquake. Comrade Qiu Qun believed that after December 1973, there was an empty area enclosed by earthquakes of magnitude 2-4 in the southeast of Tangshan. This empty area was distributed in the Bohai Sea. It did not coincide with the extreme earthquake and aftershocks of the Tangshan earthquake Coincidence, but also can find a number of similar empty area.