Three Dimensional Structure of the Mantle

这项研究是为了推进对地幔三维结构的认识。纵波和横波速度模型的改进将通过扩展以下观测结果来完成：利用1984年以后部署的许多新的宽带数字台站的数据增强了波形数据库，扩展了从数字地震记录中测量的绝对走时和差分走时数据集，并根据ISC公报开发了一个新的包含地震台站震源区异常的“汇总走时”数据库。获取该数据库之后，将联合反演波形和旅行时间；在过去，这些数据是分开处理的。除了这一主要目标之外，获得的数据将允许检查Q的大尺度各向异性和横向变化。

This research is to advance the knowledge of three dimensional structure of the Earth's mantle. The improvement of P- and S- wave velocity models will be accomplished through expansion of the following observations: augmentation of the waveform data bases using data from many new broad-band digital stations deployed after 1984, expansion of absolute and differential travel-time data sets measured from digital seismograms, and development of a new "summary travel time" data base from ISC Bulletins containing seismic station-source region anomalies. Acquisition of this data base will be followed by a joint inversion of waveforms and traveltimes; in the past these data were treated separately. In addition to this primary objective, the acquired data will allow the examination for large scale anisotropy and lateral variations in Q.