| 华南连县─博罗─港口地带地壳结构及速度分布的爆炸地震探测结果 |
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| 引用本文： | 尹周勋,赖明惠,熊绍柏,刘宏兵,滕吉文,孔祥儒.华南连县─博罗─港口地带地壳结构及速度分布的爆炸地震探测结果[J].地球物理学报,1999(3). |
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| 作者姓名： | 尹周勋 赖明惠 熊绍柏 刘宏兵 滕吉文 孔祥儒 |
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| 作者单位： | 中国科学院地球物理研究所!北京，100101 |
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| 基金项目： | 国家自然科学基金，中国科学院资助，"东亚大陆地球动力学研究"资助 |
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| 摘 要： | 在华南连县-博罗-港口地区200多个观测点上取得700多道地震记录，并绘制成6张地震记录剖面图．经过分析处理，识别出下列波组：来自地壳浅层的P波组，地壳中各界面的反射组有：P_1，P_2，P_3和P_4，莫霍面的反射波组P_m，以及上地幔顶部的折射波组P_n．经分析解释得出初步结果：①通过P震相的处理，构制了测线下方浅层地壳结构和速度分布图，它与测线穿过的断裂构造带有较好的相关性。②该地区莫霍面的反射波组P_m清晰，求得地壳平均速度为6．25km／s左右．在清远至连县之间，地壳厚度为32-34km．博罗、惠东一带地壳厚度为30km，惠东至港口之间为29．5km，说明该地区莫霍面起伏不大．地壳厚度由北向南和由西向东有逐步变薄的趋势。③观测距离较长的地震剖面图上清晰地记录到上地幔顶部的P_n民震相，该震相从140km处开始以初动出现，能量强，可追踪到200km，求得的P_n速度分别为：港口-惠东-博罗一带为8.05km／s，博罗-从化-清远一带为8．06km／s，由西向南的大湾-清远-从化-博罗一带为8．13km／s，考虑到莫霍面的起伏因素，该区P_n速度值以取8.06km／s为宜。④得到该区地壳5层结构和速度分布模型，并结合该测区的地质、地震、地热和矿产分布等资料进行了初步讨论．
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| 关 键 词： | 华南 莫霍界面 地震测深 地壳结构 |
CRUSTAL STRUCTURE AND VELOCITY DISTRIBUTION FROM DEEP SEISMIC SOUNDING ALONG THE PROFILE OF LIANXIAN-BOLUO-GANGKOU IN SOUTH CHINA |
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| YIN ZHOU-XUN, LAI MING-HUI, XIONG SHAO-BAL, LIU HONG-BING,TENG JI-WAN, KONG XIANG-RU.CRUSTAL STRUCTURE AND VELOCITY DISTRIBUTION FROM DEEP SEISMIC SOUNDING ALONG THE PROFILE OF LIANXIAN-BOLUO-GANGKOU IN SOUTH CHINA[J].Chinese Journal of Geophysics,1999(3). |
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| Authors: | YIN ZHOU-XUN LAI MING-HUI XIONG SHAO-BAL LIU HONG-BING TENG JI-WAN KONG XIANG-RU |
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| Abstract: | The Profile is located in South China, 400km long, running from Lianxian toGangkou. There are 200 recording stations being Placed along the profile to record theseismic signal from explosive sources. Six seismic bine sections are Plotted by about700 seismic recording channels, from which tWo refraction phases (P_0 and P_n and fivereflection Phases (P_1, P_2, P_3, P_4. and P_m) are traced. The P_0 travels through the shllowearth's crust and Pn is refraCted from the top of uppermantle. P_1, P_2, P_3 and P_4 arecaused by various interfaces in the crust respechtiely and Pm comes from Mohodiscontinuity. By analyzing, some Primary resultS are obtained. The shallow crustalstructure and velocity distribution having a close relationship with the faults are imagedby travel bine of P_0 wave phase. The crustal average velocity of Pm wave is 6.25 kin/s,which calculated by Pm phase with stronger energy. The thickness of the crust becomethen gradually from northWest to southeast part, but the variation of thickness is slightly.The depth of Moho is 32-34 km from Qingyuan tO Lianxian, about 30 fan at theregion of Boluo to Huldong, and 29.5 km betWeen Huidong and Gangkou. The P_nPhase can be traced beyond 140 km to 200 km from the section with longer recordingdistance. The velocity of Pn is about 8.06 km/s. A 2D model with five-layered was obtained and discussed in thes paper integrating the model with data of geologicalhistory, earthquake, geothermal survey and mineral resources. |
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| Keywords: | South China Moho disconhninty Deep seismic scuding Crustalstructure |
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