| 甘肃地区的震源深度分布 |
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| 引用本文： | 王周元.甘肃地区的震源深度分布[J].西北地震学报,1986,8(3):12-19. |
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| 作者姓名： | 王周元 |
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| 作者单位： | 国家地震局兰州地震研究所 |
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| 摘 要： | 重新定位了甘肃地区1977年1月至1984年7月的3000多个中小地震,分析对此这些地震的深度分布可以看到: 1.甘肃地区近年来中小地震主要分布在15公里以上的上部地壳中,而且这些震源在深度上呈层状分布,分别在1.5公里,7.5公里和11公里附近出现三个密集分布层。2.震源分层情况,浅层地震活动水平,地震活动“源”深度等都显示出同历史强震有关,而大震多位于地下15公里深处附近,大震对地壳介质的影响可达40公里深处。3.中小地震强度随震源深度变化不明显。文章最后还论及了定位模型对震源深度测定结果的影响问题。
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| 收稿时间： | 1984/11/17 0:00:00 |
THE DISTRIBUTION OF FOCUS DEPTH IN GANSU REGION |
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| Wang Zhouyuan.THE DISTRIBUTION OF FOCUS DEPTH IN GANSU REGION[J].Northwestern Seismological Journal,1986,8(3):12-19. |
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| Authors: | Wang Zhouyuan |
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| Institution: | Seismological Institute of Lanzhou, State Seismological Bureau, China |
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| Abstract: | More than 3000 small earthquakes in Gansu region from Jan.1977 to uly 1984 were relocated with layered crust model.It could be seen that:1.These events are located commonly in upper crust less than 15Km deep,concentrating mainly on three layers near 1.5Km,7.5Km and 11.0Km deep,respectively;2.The distribution features of foci,such as layers divided,the active evel of upper layer and "source" depth of seismic activity etc.,relate to great historical earthquakes,most of which are located about 15Km deep,fracturing the media close to 40Km deep;3.The magnitude of moderate and small events show no change with the depth of earthquake sources.Finally,it is disscussd the affection of crust model used in location to the result of depth determination. |
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