夏威夷一维深部电性构造研究  

Research on 1-D deep electrical structure in Hawaii

作　　者：梁萱 唐新功[1] 余俊虎 熊博 Liang Xuan;Tang Xingong;Yu Junhu;Xiong Bo(Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,China;Engineering Supervision Center of Sinopec Northwest Oilfield Company,Xinjiang Uygur Autonomous Region Luntai 841600,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,武汉430100 [2]中石化西北油田分公司工程监督中心,新疆维吾尔自治区轮台841600

出　　处：《地震学报》2022年第3期467-475,共9页Acta Seismologica Sinica

基　　金：国家自然科学基金(41874119,41674107);国家重点研发计划(2017YFB0202904)联合资助.

摘　　要：利用加拿大凤凰公司在夏威夷大岛地区布设的长期大地电磁观测台站,选取2018年5月至2019年4月的观测数据,反演并获得了该台站下方大岛深部的电性构造及其随时间变化的特征,并将反演结果与前人探测结果进行对比。研究结果表明:在观测点下方2—3 km处存在一个明显的低阻薄层,电阻率大约为20Ω·m,推测其可能是地表浅部发育的岩浆囊;100 km深处电阻率变化范围在20—70Ω·m,推测该深度下可能为活跃的复杂岩浆储层,反演结果与前人在邻近地区的探测结果具有可比性。Volcanic activity is closely related to deep magma transportation and material melting state.Long-term dynamic monitoring of volcanoes is helpful to master their deep structure and variation characteristics,and provides important geophysical evidence for predicting volcanic eruptions and volcanic earthquakes.We selecte the observation data from May 2018 to April 2019 for inversion,and the data come from a long-term magnetotelluric observation station set up by Phoenix Company in the Big Island,Hawaii.We obtain the deep electrical structure below the observation point and its time-varying characteristics,and compare the inversion results with the previous exploration results.The research results show that there is an obvious thin low-resistance layer at a depth of 2−3 km below the observation point,and its resistivity is about 20Ω·m.It is speculated that it may be a magma chamber developed in the shallow part of the Earth’s surface.The range of resistivity at the depth of 100 km is 20−70Ω·m.It is specu-lated that there may be an active complex magma reservoir at this depth.The inversion results are comparable with the previous exploration results in neighboring areas.

关 键 词：夏威夷 大地电磁测深法 电性结构 低阻体 岩浆囊 

分 类 号：P317.6[天文地球—固体地球物理学] P319.2[天文地球—地球物理学]