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对山西运城2016年3月12日Ms4.3和27日Ms3.4两次地震的波形特征和震源参数进行对比分析。结果显示,波形一致性很好,PmP波可能由于震源深度的差异,导致在同一台站的特征有所不同;震源机制解非常接近,说明两次地震的应力场作用方式一致。 相似文献
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采用A(b)值空间扫描方法对1980年以来河西走廊及其临近地区ML 2.3到ML 4.9地震资料进行了研究,统计分析了Ms 4.6以上地震前A(b)值异常情况,结果显示大多数Ms 4.6以上地震发生前的1-3年内,震中周围出现A(b)≥5.0的高值异常区域.R值检验结果为0.458. 相似文献
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通过研究中国大陆107次不同断层性质、不同震型、不同地区的5级以上地震的Ms与mb标度关系,用最小二乘法拟合得到:Ms=1 17mb-0 41。进一步分析发现:mb相同时,走滑断层地震的Ms大于倾滑断层地震的Ms;多震型地震的Ms大于孤立型地震的Ms。使用Ms与mb的这种关系,得到一种快速判定地震震型的方法,即对于走滑断层引起的地震,若Ms-1 17mb+0 16>0,则地震序列多数为多震型,再次发生较大或更大地震的可能性较大;对于倾滑断层引起的地震,若Ms-1 17mb+0 66<0,则地震为孤立型的可能性较大,再次发生较大或更大地震的可能性较小。 相似文献
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基于对中国大陆已发生的22个8级大震的研究,发现8级大震的发生有其规律性,这种规律性表现在8级大震发生的年份可组成一个矩形地震链,这种规律可用来对中国大陆8级大震进行预测。 相似文献
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The reason for the failure to forecast the Wenchuan M_S8.0 earthquake is under study, based on the systematically collection of the seismicity anomalies and their analysis results from annual earthquake tendency forecasts between the 2001 Western Kunlun Mountains Pass M_S8.1 earthquake and the 2008 Wenchuan M_S8.0 earthquake. The results show that the earthquake tendency estimation of Chinese Mainland is for strong earthquakes to occur in the active stage, and that there is still potential for the occurrence of a M_S8.0 large earthquake in Chinese Mainland after the 2001 Western Kunlun Mountains Pass earthquake. However the phenomena that many large earthquakes occurred around Chinese Mainland, and the 6-year long quietude of M_S7.0 earthquake and an obvious quietude of M_S5.0 and M_S6.0 earthquakes during 2002~2007 led to the distinctly lower forecast estimation of earthquake tendency in Chinese Mainland after 2006. The middle part in the north-south seismic belt has been designated a seismic risk area of strong earthquake in recent years, but, the estimation of the risk degree in Southwestern China is insufficient after the Ning’er M_S6.4 earthquake in Yunnan in 2007. There are no records of earthquakes with M_S≥7.0 in the Longmenshan fault, which is one of reasons that this fault was not considered a seismic risk area of strong earthquakes in recent years. 相似文献
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电磁辐射与孕震过程的初探 总被引:2,自引:1,他引:2
通过1994年青海共和的几次强余震和1999年河南县Ms5.1,玛沁Ms5.0,以及2000年甘肃景泰Ms5.9,兴海Ms6.6级地震前后平安电磁波资料的分析,总结了电磁辐射在进入短临阶段后的一些特征,得出了在孕震过程中电磁辐射异常与地震的关系,并初步探讨了地震电磁辐射源的形成与影响电磁辐射的可能因素。 相似文献