| 长白山天池火山区的震群活动研究 |
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| 引用本文： | 吴建平,明跃红,张恒荣,刘国明,房立华,苏伟,王未来.长白山天池火山区的震群活动研究[J].地球物理学报,2007,50(4):1089-1096. |
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| 作者姓名： | 吴建平 明跃红 张恒荣 刘国明 房立华 苏伟 王未来 |
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| 作者单位： | 1.中国地震局地球物理研究所，北京 100081 2 吉林省地震局，长春 133613 |
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| 基金项目： | 国家科技支撑计划项目(2006BAC01B04)，地震科学联合基金(106023)资助，中国地震局地球物理研究所论著号:07AC1003. |
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| 摘 要： | 2002和2003年夏季流动地震观测揭示，天池火山口附近存在大量的微震活动和一系列震群活动.地震定位结果表明地震主要发生在火山口附近，以震群形式发生的地震全部集中在天池火山口西南部，东北部地震密集区没有观测到震群活动.在夏季以外的其他季节，天池火山区只有一个固定地震台站（CBS）用于地震监测.利用CBS台不同时间的观测纪录，通过波形相关分析发现其他季节的主要震群活动仍然集中在天池西南部.震群的高精度相对定位揭示震源位置沿北西－南东向分布，倾向西南，倾角约80°. 2003年7月13日的震群发生期间，地震震源位置出现从深到浅的迁移现象，同时震源深度较大的地震在不同台站的地震波初动方向几乎全部向上，表明震源具有明显的膨胀分量.考虑到长白山天池火山2002年以来出现明显的地表形变、地球化学异常和谐频地震等现象，我们认为震群活动可能与5 km深度附近存在岩浆热液活动和岩浆增压有关.
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| 关 键 词： | 震群 火山 长白山 |
| 文章编号： | 0001-5733（2007）04-1089-08 |
| 收稿时间： | 2006-8-11 |
| 修稿时间： | 2006-08-11 |
Earthquake swarm activity in Changbaishan Tianchi volcano |
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| WU Jian-Ping,MING Yue-Hong,ZHANG Heng-Rong,LIU Guo-Ming,FANG Li-Hua,SU Wei,WANG Wei-Lai.Earthquake swarm activity in Changbaishan Tianchi volcano[J].Chinese Journal of Geophysics,2007,50(4):1089-1096. |
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| Authors: | WU Jian-Ping MING Yue-Hong ZHANG Heng-Rong LIU Guo-Ming FANG Li-Hua SU Wei WANG Wei-Lai |
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| Institution: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2 Earthquake Administration of Jilin Province, Changchun 133613，China |
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| Abstract: | In summers of 2002 and 2003，temporary seismic stations recorded a large number of small earthquakes and a series of swarms near Changbaishan Tianchi volcano. Earthquake location result shows that these earthquakes mainly occurred near the Tianchi caldera. Almost all swarms were concentrated at southwest of the caldera, and no swarms occurred in northeast area where earthquakes densely concentrated. In other seasons, the permanent station CBS is the only seismic station to monitor volcanic earthquakes in Tianchi volcano. Waveform correlation analysis of seismic data recorded at CBS in different time shows that earthquake swarms occurred in other seasons also concentrated in the southwest Tianchi Lake. High precision relative location shows that hypocenters of earthquake swarm distributed along northwest with a dip angle of 80° to southwest. During the July 13, 2003 earthquake swarm the hypocenters migrated from deep to shallow and deeper events had upward first motion directions at almost all stations. That means they had obvious expansion component in source mechanism. Taking into account of significant surface deformation in Changbaishan Tianchi volcano since 2002, geochemical anomalies and harmonic spectral earthquakes, we believe that the earthquake swarm activity was caused by magmatic and hydrothermal activity and pressureincrease of magma near the depth of 5 km. |
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| Keywords: | Earthquake swarm Volcano Changbaishan |
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