| Statistical features of aftershock distribution size for moderate and large earthquakes in Chinese mainland |
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| 作者姓名： | 蒋海昆 郑建常 吴琼 曲延军 李永莉 代磊 |
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| 作者单位： | [1]China Earthquake Networks Center, China Earthquake Administration, Beijing 100036, China [2]Earthquake Administration of Shandong Province, Ji＇ nan 250014, China [3]Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China [4]Earthquake Administration of Yunnan Province, Kunming 650041, China |
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| 基金项目： | Joint Seismological Science Foundation of China(105076)，continued subject″Statistical Features of Aftershock Sequences and Forecastof the Large Aftershocks″(2004BA601B01-04-02)，Ministry of Science and Technology of Chinain the 10th Five-year Plan. |
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| 摘 要： | Based on data of earthquake sequences with MS≥5.0 in Chinese mainland from 1970 to 2004,for different se-quence types and different rupture modes of the main shock,the relationship between aftershock distribution size Rand the magnitude of the main shock M0 has been studied statistically.Considering the rupture mode of the mainshock,we give the quantitative statistical relationships between R and M0 under 95%confidence level for differentsequence types.Qualitatively,lgR,the logarithm of the aftershock distribution size,is positively correlative to theM0,but the data distribution is dispersed.Viewing from different sequence types,the correlation between R and M0is very weak for isolated earthquake type(IET)sequence,R distributes in the range from 5 to 60 km;For main-shock-aftershock type(MAT),lgR is positively correlative to M0;For multiple main shock type(MMT),the core-lation between lgR and M0 is not very obvious when M0≤6.2 and R distributes in the range from 5 to 70 km,whileit shows a linear correlation when M0≥6.3.The statistical results also show that the occupational ratios of differentsequence types for strike-slip and oblique slip are almost the same.But for dip-slip(mostly are thrust mechanisms),the ratio of MAT is higher than that of IET and MMT.Comparing with previous results,it indicates that,when M0is large enough,R is mainly determined by M0 and there is almost no relationship with the rupture mode of themain shock.
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| 关 键 词： | 中国大陆 中等地震 大地震 余震分布 统计特征 主震断裂模式 |
| 文章编号： | 1000-9116（2007）02-0158-14 |
| 收稿时间： | 2006-08-14 |
| 修稿时间： | 2006-12-13 |
Statistical features of aftershock distribution size for moderate and large earthquakes in Chinese mainland |
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| Jiang Hai-kun , Zheng Jian-chang , Wu Qiong , Qü Yan-jun , Li Yong-li and Dai Lei.Statistical features of aftershock distribution size for moderate and large earthquakes in Chinese mainland[J].Acta Seismologica Sinica(English Edition),2007,20(2):158-169. |
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| Authors: | Jiang Hai-kun Zheng Jian-chang Wu Qiong Qü Yan-jun Li Yong-li and Dai Lei |
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| Institution: | (1) China Earthquake Networks Center, China Earthquake Administration, Beijing, 100036, China;(2) Earthquake Administration of Shandong Province, Ji’nan, 250014, China;(3) Earthquake Administration of Xinjiang Uygur Autonomous Region, ürümqi, 830011, China;(4) Earthquake Administration of Yunnan Province, Kunming, 650041, China |
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| Abstract: | Based on data of earthquake sequences with M
S≥5.0 in Chinese mainland from 1970 to 2004, for different sequence types and different rupture modes of the main shock, the
relationship between aftershock distribution size R and the magnitude of the main shock M
0 has been studied statistically. Considering the rupture mode of the main shock, we give the quantitative statistical relationships
between R and M
0 under 95% confidence level for different sequence types. Qualitatively, lgR, the logarithm of the aftershock distribution size, is positively correlative to the M
0, but the data distribution is dispersed. Viewing from different sequence types, the correlation between R and M
0 is very weak for isolated earthquake type (IET) sequence, R distributes in the range from 5 to 60 km; For mainshock-aftershock type (MAT), lgR is positively correlative to M
0; For multiple main shock type (MMT), the correlation between lgR and M
0 is not very obvious when M
0≤6.2 and R distributes in the range from 5 to 70 km, while it shows a linear correlation when M
0≥6.3. The statistical results also show that the occupational ratios of different sequence types for strike-slip and oblique
slip are almost the same. But for dip-slip (mostly are thrust mechanisms), the ratio of MAT is higher than that of IET and
MMT. Comparing with previous results, it indicates that, when M
0 is large enough, R is mainly determined by M
0 and there is almost no relationship with the rupture mode of the main shock.
Foundation item: Joint Seismological Science Foundation of China (105076) and continued subject “Statistical Features of Aftershock Sequences
and Forecast of the Large Aftershocks” (2004BA601B01-04-02) and Ministry of Science and Technology of China in the 10th Five-year
Plan. |
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| Keywords: | Chinese mainland aftershock distribution size types of aftershock sequences rupture mode of the main shock |
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