| 1997-2003年新疆伽师地震序列时空分布研究 |
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| 引用本文： | 王筱荣,孙甲宁,王季达.1997-2003年新疆伽师地震序列时空分布研究[J].内陆地震,2005,19(2):113-121. |
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| 作者姓名： | 王筱荣 孙甲宁 王季达 |
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| 作者单位： | 新疆维吾尔自治区地震局,新疆,乌鲁木齐,830011 |
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| 基金项目： | 国家科技攻关项目2004BA601801-04-01和新疆维吾尔自治区科技攻关项目200333116.3资助. |
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| 摘 要： | 分析研究了伽师地震序列目录。分析结果表明：①1997-2003年伽师地震分为3个发震阶段，不同阶段具有各自的活动特点，第一阶段6级地震频次高，第二阶段5级地震频次高，第三阶段地震强度大，高b值是伽师序列明显起伏前的主要特征；②伽师6级地震经历了由西南向北东再向东南的发展过程，1997年4月16日前发生的6级地震余震分布倾向性不显著，其后发生的6级地震的余震大都分布在主震南侧，2003年2月24日伽师6．8级地震余震分布形态与以往6级地震明显不同，这可能与该区特殊的构造条件有关;③1998年以前伽师6级地震余震扩展不明显，1998年8月27日6级地震余震已显现出扩展趋势，2003年2月24日6级地震余震扩展显著;④伽师强震群6级地震震源深度介于17—31km范围，1997年4月16日后震源深度维持在27km左右范围，表明伽师序列初始破裂从上地壳开始，而优势破裂深度在中地壳；⑤伽师地震整体上表现出由浅到深的分布特征，3个活动阶段5级地震也具有这种特征，多数5级以上地震的震源深度正是震区高速体存在区。
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| 关 键 词： | 伽师地区 6级地震 序列时空特征 |
| 文章编号： | 1001-8956（2005）02-0113-09 |
| 收稿时间： | 2004-11-21 |
| 修稿时间： | 2004年11月21 |
RESEARCH OF THE TIME AND SPACE DISTRIBUTION FOR THE JIASHI EARTHQUAKE SEQUENCE IN XINJIANG FROM 1997 TO 2003 |
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| WANG Xiao-rong,SUN Jia-ning,WANG Ji-da.RESEARCH OF THE TIME AND SPACE DISTRIBUTION FOR THE JIASHI EARTHQUAKE SEQUENCE IN XINJIANG FROM 1997 TO 2003[J].Inland Earthquake,2005,19(2):113-121. |
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| Authors: | WANG Xiao-rong SUN Jia-ning WANG Ji-da |
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| Abstract: | We analyzed and studied the catalog of Jiashi earthquake sequence. The result showed: The Jiashi earthquake sequence from 1997 to 2003 was composed by three phases of occurring earthquakes, the different phases had themselves characteristics, the frequency of M6 earthquakes was high in first phase, the frequency of M5 earthquakes was high in second phase, the earthquake intension was high in the third phase, and the main characteristic before the obvious change of Jiashi earthquake sequence was high b value; The developing course of Jiashi earthquake sequence is from SW direction to NE direction to SE direction, the distribution of M6 earthquakes' aftershocks before Apr. 16, 1997 isn't obvious, the aftershocks of most of the later M6 earthquakes in the south of the main earthquakes, the aftershocks' distribution was different between the Jiashi M6.8 earthquake in Feb. 24, 2003 and the other M6 earthquakes, the reason can be the especial construct; The expansion of the aftershocks of Jiashi M6 earthquakes before 1998 wasn't obvious, the obvious expansion trend occurred in the aftershocks of the M6 earthquake in Aug. 27, 1998, the obvious expansion occurred in the aftershocks of the M6 earthquake in Feb.24,2003; the focal depths of the Jiashi strong earthquakes cluster were from 17km to 31km, the focal depths were about 27km after Apr.16,1998, this showed the first fracture of the Jiashi earthquake sequence started from the crust, but the main fracture started from the middle crust; the distribution characteristic of Jiashi earthquake is from shallow to deep, the M5 earthquakes in three phases also had the same characteristic, most of the M5 earthquakes' occurred in the high-speed region. |
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| Keywords: | Jiashi region M6 earthquakes Time and space characteristic of sequence |
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