| 2010年2月27日智利Mw8.8地震前全球地震活动特征分析 |
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| 引用本文： | 薛艳,刘杰,李纲. 2010年2月27日智利Mw8.8地震前全球地震活动特征分析[J]. 地震学报, 2011, 33(3): 292-303. DOI: 10.3969/j.issn.0253-3782.2011.03.003 |
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| 作者姓名： | 薛艳 刘杰 李纲 |
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| 作者单位： | 1 ）中国北京 100081中国地震局地球物理研究所 宋体 2 ）中国北京 100045中国地震台网中心 |
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| 基金项目： | 国家“973”项目(2008CB425704)资助 |
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| 摘 要： | 通过对智利地震前全球不同时空范围地震活动特征分析,发现:①智利地震前出现了两类地震空区:第一类空区为1900年以来形成的360 km长的Mw≥8.0地震空段,第二类空区为震前5年形成的780 km长的M≥5.5地震空段;②1986-2010年,智利中南部仅发生1次Mw7.1地震,表现为显著的Mw≥7.0地震平静异常;③...
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| 关 键 词： | 智利地震 地震空区 中、深源地震 南美板块 环太平洋地震带 |
Characteristics of seismic activity before 27 February 2010 Chile M_W8.8 earthquake |
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| Xue Yan,Liu Jie,Li Gang. Characteristics of seismic activity before 27 February 2010 Chile M_W8.8 earthquake[J]. Acta Seismologica Sinica, 2011, 33(3): 292-303. DOI: 10.3969/j.issn.0253-3782.2011.03.003 |
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| Authors: | Xue Yan Liu Jie Li Gang |
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| Affiliation: | 1）Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2span style=font-size: 1 |
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| Abstract: | Spatio-temporal variation of seismic activity before the greatChileearthquake on February 27, 2010, is studied. Some results are as follows: ① Two types of seismic gaps appeared before the Chile MW8.8 shock. One is the background gap of MWge;8.0 earthquakes with360 kmlong since 1900. The other is the seismogenic gap of Mge;5.5 earthquakes with780 kmlong 5 years before the Chile earthquake. ② There was only one earthquake with MW7.1 inmiddle and southern part of Chile from 1986 to 2010. This is the long-term background anomaly of the obvious quiescence of MWge;7.0 earthquakes before the Chile earthquake. ③ The quiescence of earthquakes with Mge;6.5 appeared in South American Plate and its vicinity during 2007mdash;2009, and the quietude state has been disappeared three months before the MW8.8 shock. ④The deep and intermediate-depth earthquake activity has been noticeably strengthened in the subduction zone of South American Plate since 1993. ⑤ The great Chile earthquake shows that the global seismicity is still in the active period of MWge;8.5 earthquakes since 2004. Based on the characteristics of the former two active periods, several MWge;8.5 great earthquakes would take place in a few years. In addition, the circum Pacific seismic belt would be the main region for MWge;8.0 earthquakes. |
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| Keywords: | Chile earthquake seismic gap deep and intermediate-depth earthquake South American Plate circum-Pacific seismic belt |
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