The Characteristics of Time Residual between ML≥2.0 Earthquake Occurrence and Its Corresponding Time of Solid Earth Tidal Maximum in Tangshan Old Seismic Region
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摘要: 以固体潮极值时刻与地震发震时刻的时间差为参数，统计了唐山老震区ML≥2.0地震的时差在月、半月、日、半日尺度下的各时间分段内的频度分布。结果显示唐山地区的地震活动高频度时段与固体潮极值时刻有对应性，表明其在一定程度上受到了固体潮作用的影响。其中唐山断裂中东段的地震落入触发时段内的几率更大，似乎意味着唐山地区的应力集中区主要还是集中在唐山断裂中东段。另外，强震之后1~3周余震受固体潮极值的影响显著，所以此时间内应更加注意在固体潮接近极值时发生强余震的可能性。Abstract: Based on the time residual between earthquake occurrence and its corresponding time of solid earth tidal maximum, we analyzed the distribution of these time residuals in different statistics time span with the month, half month, day and half day for Tangshan ML ≥ 2.0 earthquakes. The results reflect that the higher seismicity time in Tangshan is more or less synchronous with the earth tidal maximum, which maybe indicate these earthquakes had been triggered by tide to some extent. In space, those earthquakes with more chances to fall into the tidal triggering time mostly locate in the middle and eastern of Tangshan fault. This phenomenon maybe also indicates the remarkable area for the regional stress accumulating is still concentrated at this segment mentioned above. In addition, in 1-3 weeks after the main strong earthquake, the aftershocks are distinctly enhanced by earth tide. Thus it needs to put more attention on the occurrence of strong aftershock when the time is close to the tidal maximum.
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