长白山—镜泊湖火山区地壳结构接收函数研究
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摘要
利用71个远震的波形资料,用接收函数方法提取了布设在长白山—镜泊湖火山区的34个宽频带流动数字地震台站的接收函数,通过对接收函数反演,获得了台站下方的S波速度结构.研究结果表明,沈阳—敦化一线莫霍面深度32～33km ,向西地壳厚度加厚,到长春附近地壳厚度约为36km .在天池火山口莫霍面深度为达38km ,而镜泊湖火山口森林的莫霍面深度约为39km .总体看研究区的地壳厚度是南浅北深.长白山天池火山口附近地下10km左右有一明显的低速层存在;镜泊湖火山口森林附近30km也可能有低速体存在;研究发现莫霍面上S波速度梯度在火山口附近和远离火山口有明显区别.在火山口附近其莫霍面的S波速度梯度比非火山口地区的S波速度梯度明显小,说明火山口下与一般的地壳莫霍面结构有差别.研究发现沈阳—敦化一线两侧的莫霍面深度有较大变化,其位置与地表的敦化—密山断裂基本一致,说明敦化—密山断裂是研究区的一条非常重要的地质构造带.
We have obtained 34 receiver functions from 71 teleseismic waveforms recorded by 34 stations that were installed in Changbaishan-Jingpohu volcanic area. Through inversing receiver function of 34 seismic stations, we obtain S wave velocity structures beneath the stations. The results revealed that the Moho depth is about 32～33km along Shenyang-Dunhua direction and becomes deeper toward its west side. In Changchun area, the Moho thickness reaches about 36km,and under the crater of Changbai-Tianchi volcano the depth of Moho reaches about 38km, while beneath Jinpohu volcanic area, Moho depth is about 39km. Overall, the crust of studied area is thick in north and thin in south. We found an anomalous layer with obvious low S wave velocity beneath Changbai-Tianchi crater at about 10km depth. Beneath Jingpohu volcanic area there is also possibly a low S-wave velocity anomalous body at about 30km depth. The results show that the S-wave velocity gradients at Moho are obviously different near and far from the crater. The gradient near crater is clearly smaller than that in areas without volcano, which suggests that Moho structures beneath volcano are different from general Moho structures in other areas. The crust thickness at two sides of Shenyang-Dunhua direction has a comparatively great change and its location is almost same as Dunhua-Mishan fault at near surface. Therefore, Dunha-Mishan fault is a very important geological structure zone in the studied area.
We have obtained 34 receiver functions from 71 teleseismic waveforms recorded by 34 stations that were installed in Changbaishan-Jingpohu volcanic area. Through inversing receiver function of 34 seismic stations, we obtain S wave velocity structures beneath the stations. The results revealed that the Moho depth is about 32～33km along Shenyang-Dunhua direction and becomes deeper toward its west side. In Changchun area, the Moho thickness reaches about 36km,and under the crater of Changbai-Tianchi volcano the depth of Moho reaches about 38km, while beneath Jinpohu volcanic area, Moho depth is about 39km. Overall, the crust of studied area is thick in north and thin in south. We found an anomalous layer with obvious low S wave velocity beneath Changbai-Tianchi crater at about 10km depth. Beneath Jingpohu volcanic area there is also possibly a low S-wave velocity anomalous body at about 30km depth. The results show that the S-wave velocity gradients at Moho are obviously different near and far from the crater. The gradient near crater is clearly smaller than that in areas without volcano, which suggests that Moho structures beneath volcano are different from general Moho structures in other areas. The crust thickness at two sides of Shenyang-Dunhua direction has a comparatively great change and its location is almost same as Dunhua-Mishan fault at near surface. Therefore, Dunha-Mishan fault is a very important geological structure zone in the studied area.
引文
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[14]RameshDS ,KindR ,YuanX .ReceiverfunctionanalysisoftheNorthAmericancrustanduppermantle.Geophys.J .Int.,2002,150:91～108
[15]FountainDM ,ChristensenMI.Compositionofthecontinentalcrustanduppermantal:areview.Geol.Soc.Amer.Bull,1989,172:711～742
[16]O’ConnellRJ ,BudianskyB .Seismicvelocitiesindryandsaturatedcrackedsolids.J .Geophys.Res.,1974,79:5412～5426
[2]刘嘉麒.中国火山.北京:科学出版社,1999LiuJQ .ChinaVolcano(inChinese).Beijing:SciencePress,1999
[3]张立敏,唐晓明.西太平洋板块俯冲运动与中国东北深震带.地球物理学报,1983,26(4):331～340ZhangLM ,TangXM .TheunderthrustingmovementoftheWesternPacificPlateandthedeepfocusearthquakezoneofthe NortheastChina.ChineseJ .Geophys.(inChinese),1983,26(4):331～340
[4]傅维洲.中国东北深震及其构造意义.长春地质学院学报,1996,26(3):316～321FuWZ .DeepearthquakesinNortheastChinaandtheirtectonicsignificance.TheJournalofChangchunGeologicalCollege(inChinese),1996,26(4):316～321
[5]刘若新,李继泰,魏海泉等.长白山天池火山———一座具有喷发危险的近代火山.地球物理学报,1992,35(5):661～665LiuRX ,LiJT ,WeiHQ ,etal.VocanoatTianchiLake,ChanbaishanMT .—modernvolcanowithpotentialdangeroferuption.ChineseJ .Geophys.(inChinese),1992,35(5):661～665
[6]刘若新,李继泰,汤 吉等.长白山天池火山研究进展.地震电磁观测研究,1996,17(4):2～11LiuRX ,LiJT ,TangJ,etal.ProgressofthestudyonTianchiVolcano,Changbaishan.SeismologicalandGeomagneticObservationandResearch(inChinese),1996,17(4):2～11
[7]张贻侠,孙运生,张兴洲等.中国满洲里—绥芬河地学断面.北京:地质出版社,1998ZhangYX ,SunYS ,ZhangXZ ,etal.ChinaManzhouliSuifenheGeoSection.Beijing:GeologicalPublishingHouse,1998
[8]张先康,张成科,赵金仁等.长白山天池火山区岩浆系统深部构造的深地震研究.地震学报,2002,24(2):135～143ZhangXK ,ZhangCK ,ZhaoJR ,etal.DeepseismicsoundinginvestigationintodeepstructureofthemagmasysteminChangbaishanTianchivolcanicregion.ActaSeismologicSinica(inChinese),2002,24(2):135～143
[9]汤 吉,刘铁胜,江 钊等.长白山天池火山区大地电磁测深初步观测.地震地质,1997,19(2):164～169TangJ,LiuTS ,JiangZ ,etal.PreliminaryobservationoftheTianchivolcanoareainChangbaishanMountainbyMTmethod.SeismologyandGeology(inChinese),1997,19(2):164～169
[10]朱仁学,付维洲,孟令顺等.黑龙江镜泊湖火山地区电性结构初步研究.地震地质,2001,23(2):186～190ZhuRX ,FuWZ ,MengLS ,etal.PreliminarystudyonelectricintheJingbohuvolcanoareaofHeilongjiangprovince.SeismologyandGeology(inChinese),2001,23(2):186～190
[11]吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构.地球物理学报,1998,41(5):669～679WuQJ ,ZengRS .ThecrustalstructureofQinghaiXizhangPlateauinferredfrombroadteleseismicwaveform.ChineseJ .Geophys.(inChinese),1998,41(5):669～679
[12]DuekerKG ,SheehanAF .MantlediscontinuitystructurebeneaththeColoradoRockyMountainsandHighplains.J .Geophys.Res.,1998,103:7153～7169
[13]AiYinshuang,ZhengTianyu,XuWeiwei,etal.Acomplex660kmdiscontinuitybeneathnorthestChina.EarthandPlanetaryScienceLetters,2003,212:63～71
[14]RameshDS ,KindR ,YuanX .ReceiverfunctionanalysisoftheNorthAmericancrustanduppermantle.Geophys.J .Int.,2002,150:91～108
[15]FountainDM ,ChristensenMI.Compositionofthecontinentalcrustanduppermantal:areview.Geol.Soc.Amer.Bull,1989,172:711～742
[16]O’ConnellRJ ,BudianskyB .Seismicvelocitiesindryandsaturatedcrackedsolids.J .Geophys.Res.,1974,79:5412～5426
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