| 青海省河南MS5.1和玛沁MS5.0地震后库玛断裂带的地震活动趋势研究 |
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| 引用本文： | 都昌庭,杨广华.青海省河南MS5.1和玛沁MS5.0地震后库玛断裂带的地震活动趋势研究[J].西北地震学报,2001,23(2):155-159. |
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| 作者姓名： | 都昌庭 杨广华 |
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| 作者单位： | 1. 青海省地震局,
2. 青海省都兰地震台, |
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| 基金项目： | 国家重点基础研究项目(95-13-01-02)． |
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| 摘 要： | 根据地震活动特征、大武地震台尾波持续时间及长宁、湟源和西宁3个台水氡异常变化，讨论了1999年河南Ms5.1和玛沁Ms5.0地震发生后库玛断裂带的地震活动趋势，结果表明，河南-玛沁地区的中强地震活动与库玛断裂带上的强震活动有明显的对应关系；在库玛断裂带中东段存在一个由ML≥3.0地震围成的空区；上述2次地震发生后大武地震台尾波持续时间异常依然存在，长宁、湟源和西宁台水氡趋势异常仍然持续，据此认为库玛断裂带存在发生强震的背景。
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| 关 键 词： | 青海 库玛断裂带 地震活动趋势 地质构造 地震前兆异常 |
| 文章编号： | 1000-0844（2001）02-0160-04 |
| 收稿时间： | 2000/7/24 0:00:00 |
| 修稿时间： | 2000年3月14日 |
A STUDY ON EARTHQUAKE TREND OF KUMA FAULT ZONE AFTER THE HENAN MS5. 1 AND MAQIN MS5. 0 EARTHQUAKES IN QINGHAI PROVINCE |
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| DU Chang-ting and Yang Guang-hua.A STUDY ON EARTHQUAKE TREND OF KUMA FAULT ZONE AFTER THE HENAN MS5. 1 AND MAQIN MS5. 0 EARTHQUAKES IN QINGHAI PROVINCE[J].Northwestern Seismological Journal,2001,23(2):155-159. |
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| Authors: | DU Chang-ting and Yang Guang-hua |
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| Affiliation: | Seismological Bureau of Qinghai Province, Xining 810001, China and Dulan Seismostation, Qinghai Province, Dulan 816100, China |
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| Abstract: | The space distribution characteristics of structures from topography and landform of the south part of Ordos block and Weihe basin are analyzed.It is considered that three dimensional cross structures are formed by three NW upwarpings of the south part of Ordos block and EW subsidence centers which range obliquely as well as cross uplifts among them in Weihe basin.The space distribution of historical and modern earthquakes in and surrounding the Weihe basin shows that three dimensional cross structures have a strong dominion on seismicity in the basin. |
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| Keywords: | Three dimensional cross structure Weihe basin Earthquake space distribution Ordos block |
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