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| 滇西南地震活动特征分析 | |
| 引用本文： | 毕青,沈坤,续外芬,马丽霞,张晓岗,李祥,夏开平,张体移,熊瑞.滇西南地震活动特征分析[J].高原地震,2010,22(1):10-16. |
| 作者姓名： | 毕青 沈坤 续外芬 马丽霞 张晓岗 李祥 夏开平 张体移 熊瑞 |
| 作者单位： | 1. 云南省玉溪市防震减灾局,云南,玉溪,653100 2. 云南省峨山县防震减灾局,云南,峨山,653200 3. 云南省江川县防震减灾局,云南,江川,652600 4. 云南省澄江县防震减灾局,云南,澄江,652500 5. 云南省通海县防震减灾局,云南,通海,652700 6. 云南省玉溪市红塔区防震减灾局,云南,玉溪,653100 |
| 基金项目： | 由中国地震局监测预报司震情跟踪合同制课题 |
| 摘 要： | 对滇西南1970年以来所有M≥4.6级地震前的空间活动图像进行研究,用地震频度作为参数描述地震前区域的地震活动增强与平静现象,用空区、条带描述地震的孕震过程,得到以下认识:①地震频度增加是滇西南地区5级以上地震前的共性特征;②滇西南地区M≥4.6级地震前出现空区的比例随着地震震级的增加而有所增加,4.6~4.9级地震前只有60%的地震出现空区,5.0~5.9级地震前有90.9%的地震出现空区,而6.0级以上地震前全部出现空区;③空区平均持续时间也随着震级的加大而增加,空区平均持续时间为13.58个月,最短为3个月,最长为37个月;④主震位置(27/33)多发生在空区边缘(含长轴端12次、短轴端8次)。震前出现条带的规律则不明显。 |
| 关 键 词： | 滇西南地震 空间图像 地震活动特征 |
ANALYSIS OF SEISMIC CHARACTERISTICS IN SOUTHWEST OF YUNNAN |
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| BI Qing,SHEN Kun,XU Waifen,MA Lixia,ZHANG Xiaogang,LI Xiang,XIA Kaiping,ZHANG Tiyi,XIONG Rui.ANALYSIS OF SEISMIC CHARACTERISTICS IN SOUTHWEST OF YUNNAN[J].Plateau Earthquake Research,2010,22(1):10-16. | |
| Authors: | BI Qing SHEN Kun XU Waifen MA Lixia ZHANG Xiaogang LI Xiang XIA Kaiping ZHANG Tiyi XIONG Rui |
| Institution: | 1.Yuxi Earthquake Prevention And Disaster Mitigation Bureau,Yunnan Province,Yuxi 653100,China;2.Ersan County Earthquake Prevention And Disaster Mitigation Bureau,Yunnan Province,Ersan 653200,China; 3.Jiangchuan County Earthquake Prevention And Disaster Mitigation Bureau,Yunnan Province,Jiangchuan 652600,China; 4.Chengjiang County Earthquake Prevention And Disaster Mitigation Bureau,Yunnan Province,Chengjiang 652500,China; 5.Tonghai County Earthquake Prevention And Disaster Mitigation Bureau,Yunnan Province,Tonghai 652700,China; 6.Hongta Earthquake Prevention And Disaster Mitigation Bureau In Yuxi,Yunnan Province,Yuxi 653100,China) |
| Abstract: | The spatial patterns of M≥4.6 earthquakes in southwest of Yunnan province since 1970 are studied by using the earthquake frequency parameters to describe the increase and quiet phenomena before earthquakes in the region,and using gaps and belts to describe the process of earthquakes,then got the following results：①The increase in frequency is the common characteristics before M≥5 earthquakes in southwest of Yunnan province;②The gap ratio increases with the earthquake magnitude,and the gap ratio is 60% of 4.6~ 4.9 earthquakes,90.9% of 5.0 ~ 5.9 earthquakes,100% of 6.0 -6.9 and 7.0- 7.9 earthquakes;③The average duration of gaps is also increased with the magnitude,which is 13.58 months,the minimum is 3 months,the maximum is 37 months;④The main shocks＇ locations（27/33） occurred within the edge of gaps（including the long axis side 12 times,short axis side 8 times）.Belts before earthquakes are not significant. |
| Keywords: | Earthquakes in southwest of Yunnan province Spatial pattern Seismic characteristic |
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