镜泊湖火山地震监测研究
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摘要
利用布设在镜泊湖"火山口森林"附近的14个24位宽频带三分量流动地震台站所记录的地震资料,对镜泊湖火山区地震活动进行了研究。观测结果表明镜泊湖及周围地区有一定的地震活动性,但活动水平不高,经综合分析认为所记录的地震大部分为火山构造地震。从地震定位的结果看大部分地震震源深度在10～30km之间,震级大部分小于ML2.0,震中主要集中在"火山口森林"和穿过火山区的敦化-密山断裂附近。在记录条件较好的2号台,记录到2种可能与火山活动有关的事件,其波形特征与长周期火山事件(LP)和火山颤动事件的波形特征有相似之处,但频率特征不同。
The Jingpohu volcano cluster lies on the southwest of Ningan county seat,Mudanjiang city,Heilongjiang Province,China.There are 13 craters in this area and the volcano cluster formed in Holocene Epoch is concentrated in the two areas of Crater Forest and Hamatang.According to the recent studies,Jingpohu volcano cluster is located on the western side of the Dunhua-Mishan Fault,where the volcanic activity has been highly frequent and the volcanoes were active in Paleocene,Eocene and Holocene.These volcanisms were associated with strong earthquakes of magnitude 6～7.In order to understand the volcanic activities as well as the structure features of crust and upper mantle in this area,14 broadband seismic stations with 24 bit digital seismographs were installed around Crater Forest in Jingpohu volcano area and various seismic events including the volcanic tectonic earthquakes and the volcanic-like events were recorded.In this paper,based on the analysis of a great deal of data,the earthquake type classification,seismicity analysis and earthquake location were carried out.The classification of recorded event types indicate that the earthquakes observed in Jingpohu volcanic area are mainly of volcanic tectonic ones while the seismicity was not high during the recording periods,and at the same time,two types of earthquakes which are different from tectonic ones were recorded.Among these events,the waveform features of one type of events are similar to the volcanic events with long period(LP),however,compared with standard volcanic events with long period(LP),their frequencies are higher;the other type of events have some similar features with volcanic tremors.It could be seen from earthquake location results that the most focus depths range from 10 to 30km and their epicenters are mainly concentrated on the southwestern side of craters.There are few earthquakes in the interior of craters and their magnitudes are mostly less than 2.0.It is suggested that the occurrence of these earthquakes is possibly related with the activities of Dunhua-Mishan fault because the volcanic and seismic activities during observation periods in Jingpohu volcano area are not too obvious and the epicenters are mainly distributed near Crater Forest and Dunhua-Mishan fault.Close attention should be paid to the volcanic-like events with long period and the tremors recorded around Crater Forest.However,it needs further research to make sure that whether the two types of events recorded in this area are related to the magmatic activities because of shorter observation time and a few recorded events available in this study.
The Jingpohu volcano cluster lies on the southwest of Ningan county seat,Mudanjiang city,Heilongjiang Province,China.There are 13 craters in this area and the volcano cluster formed in Holocene Epoch is concentrated in the two areas of Crater Forest and Hamatang.According to the recent studies,Jingpohu volcano cluster is located on the western side of the Dunhua-Mishan Fault,where the volcanic activity has been highly frequent and the volcanoes were active in Paleocene,Eocene and Holocene.These volcanisms were associated with strong earthquakes of magnitude 6～7.In order to understand the volcanic activities as well as the structure features of crust and upper mantle in this area,14 broadband seismic stations with 24 bit digital seismographs were installed around Crater Forest in Jingpohu volcano area and various seismic events including the volcanic tectonic earthquakes and the volcanic-like events were recorded.In this paper,based on the analysis of a great deal of data,the earthquake type classification,seismicity analysis and earthquake location were carried out.The classification of recorded event types indicate that the earthquakes observed in Jingpohu volcanic area are mainly of volcanic tectonic ones while the seismicity was not high during the recording periods,and at the same time,two types of earthquakes which are different from tectonic ones were recorded.Among these events,the waveform features of one type of events are similar to the volcanic events with long period(LP),however,compared with standard volcanic events with long period(LP),their frequencies are higher;the other type of events have some similar features with volcanic tremors.It could be seen from earthquake location results that the most focus depths range from 10 to 30km and their epicenters are mainly concentrated on the southwestern side of craters.There are few earthquakes in the interior of craters and their magnitudes are mostly less than 2.0.It is suggested that the occurrence of these earthquakes is possibly related with the activities of Dunhua-Mishan fault because the volcanic and seismic activities during observation periods in Jingpohu volcano area are not too obvious and the epicenters are mainly distributed near Crater Forest and Dunhua-Mishan fault.Close attention should be paid to the volcanic-like events with long period and the tremors recorded around Crater Forest.However,it needs further research to make sure that whether the two types of events recorded in this area are related to the magmatic activities because of shorter observation time and a few recorded events available in this study.
引文
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刘志,张先康,王夫运,等.2005.用走时反演计算长白山天池火山区二维地壳泊松比[J].地震学报,27(3):324—331.LIU Zhi,ZHANG Xiang-kang,WANG Fu-yun,et al.2005.2-D crustal Poisson s ratio from seismic travel time in-version in Changbaishan Tianchi volcanic region[J].Acta Seimologica Sinica,27(3):324—331(in Chinese).
吴建平.2005.中国大陆火山监测研究进展[J].地震地磁观测与研究,26(5):1—10.WUJian-ping.2005.The recent progress of volcanic monitoring in China Mainland[J].Seismological and Geomagnet-ic Observation and Research,26(5):1—10(in Chinese).
吴建平,明跃红,张恒荣,等.2005.2002年夏季长白山天池火山区的地震活动研究[J].地球物理学报,48(3):621—628.WU Jian-ping,MING Yue-hong,ZHANG Heng-rong,et al.2005.Seismic activity at the Changbaishan Tianchi volca-no in the summer of2002[J].Chinese J Geophys,48(3):621—628(in Chinese).
王椿镛,楼海,吴建平,等.2002.腾冲火山地热区地壳结构的地震学研究[J].地震学报,24(3):231—242.WANG Chun-yong,LOU Hai,WU Jian-ping,et al.2002.Seismological study on the crustal structure of TengchongVolcano—geothermal area[J].Acta Seismologica Sinica,24(3):231—242(in Chinese).
叶建庆,蔡绍平,刘学军,等.2003.腾冲火山地震群的活动特征[J].地震地质,25(增刊):128—137.YE Jian-qing,CAI Shao-ping,LIU Xue-ju,et al.2003.Characteristics of earthquake cluster activity in Tengchongvolcano area[J].Seismology and Geology,25(Suppl):128—137(in Chinese).
张先康,张成科,赵金仁,等.2002.长白山天池火山区岩浆系统深部构造的深地震研究[J].地震学报,24(2):135—143.ZHANG Xian-kang,ZHANG Cheng-ke,ZHAO Jin-ren,et al.2002.Deep seismic sounding investigation into deepstructure of the magma system in Changbaishan Tianchi volcanic region[J].Acta Seismologica Sinica,24(2):135—143(in Chinese).
张先康,石林珂.1987.地震定位的广义反演方法及程序[J].华北地震科学,5(3):1—17.ZHANG Xian-kang,SHI Lin-ke.1987.A method of general inversion and its program for earthquake location[J].North China Earthquake Science,5(3):1—17(in Chinese).
Chouet B A.1996.Long-period volcano seismicity:its source and use in eruption forecasting[J].Nature,380(28):309—316.
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