夏威夷瓦胡岛地区接收函数特征分析

研究壳幔间断面转换波信息的接收函数方法是一种非常有效的地球物理探测技术。我们采用P波接收函数方法对夏威夷瓦胡岛地区布设的一个宽频带地震台站所采集到的数据进行了处理,得到该台站下方接收函数径向分量和切向分量的特征,并对所得到的径向接收函数进行时深转换处理,得到该地区410 km间断面的深度信息。结果表明:该台站的西北方和西南方存在明显的横向非均匀介质,且该地区410 km间断面的深度变浅,大约为390 km,反映了瓦胡岛下方存在热的地幔熔融物质。

Analysis of Characteristics of Receiver Functions in Oahu Island of Hawaii Area

Receiver function method,which is often used to obtain the information from the subsurface in the crust and mantle of the Earth,is a very useful geophysical prospecting tool.Data from one station KIP deployed in Hawaii area were processed by using the P-wave receiver function technique.We analyzed the characteristics of radial and tangential receiver functions,and committed the time-depth conversion for the radial receiver function to obtain the information from 410 km discontinuity.Results show that there is obvious laterally heterogeneity in southwest and northwest of station KIP,and the 410 km discontinuity becomes shallower with the depth of about 390 km which may be the response of a hot melt matter beneath the KIP station.