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一、前言鄂尔多斯地块周边断陷系是我国历史地震活跃区。据历史文字记载,近2000年期间该区曾发生4次8级地震,6次7～7 1/2级地震,28次6～6 3/4级地震。有关该区7级以上历史强震与活动断裂的关系,一直受到地震地质学者的关注。但对于该区6级地震的构造背景讨论不多。在Wells统计的全球19世纪下半叶以来发生的地震数据库中,在有地表破裂的122次地震中,震级等于或大于7级的地震54次,占有地表破裂地震总数的45%,震级6～6.9级的地震52次,占总数的42%。这些有地表破裂的6～6.9级地震,约40%发
I. Introduction The faulted depression system around the Ordos block is an active area of historical earthquake in our country. According to historical records, there have been 4 M8 earthquakes, 6 7 7 7 1 earthquakes and 28 6 6 6 3/4 earthquakes in this area in the past 2000 years. The relationship between the history of strong earthquakes and active faults above Grade 7 in this area has always been the concern of seismologists. However, there is not much discussion on the tectonic setting of the MS6 earthquakes in this area. Among the 122 Earthquakes with surface ruptures, 54 earthquakes with magnitudes equal to or greater than 7, accounting for 45% of the total amount of surface rupture earthquakes in earthquakes occurring in the second half of the 19th century by Wells, have a magnitude of 6 ~ 6.9 earthquakes 52 times, accounting for 42% of the total. These earthquakes of 6 ~ 6.9 earthquakes, about 40% of the hair