Studies of Global Seismicity and Earth's Structure

Dziewonski EAR-0207608该项目的主要目标是系统地调查全球地震活动和绘制地球内部的三维地图。地震研究主要围绕哈佛大学的CMT项目展开。利用来自全球分布的地震仪的数字资料，对所有震级大于约5.2级的地震进行了震源机制分析。不寻常的地震现象，如慢地震、火山坍塌和不明地震信号，将被详细研究。研究结果通过电子邮件和哈佛大学地震学网站发布：http://www.seismology.harvard.edu.地球内部弹性性质的成像是通过开发新的数据集和联合反演各种现有的数据集来进行的，这些数据集包括绝对和差分走时、面波频散曲线、全波形和简正波频谱。在模型的参数化和反演中特别考虑了各向异性(径向、方位和一般各向异性)的考虑。模型和衍生的数据集可以在调查人员的网站上找到。

DziewonskiEAR-0207608The principal objectives of this project are the systematic investigation of global seismicity and the three-dimensional mapping of the Earth's interior. The earthquake studies are focused around the Harvard CMT project. All earthquakes with magnitudes greater than approximately 5.2 are analyzed for their source mechanisms using digital data from globally distributed seismographs. Unusual seismic phenomena, such as slow earthquakes, volcanic collapses, and unidentified seismic signals, are investigated in detail. Results are disseminated using electronic mail and the Harvard Seismology web page: http://www.seismology.harvard.edu. The imaging of the elastic properties of the Earth's interior is pursued by development of new data sets and the joint inversion of various existing data sets, such as absolute and differential travel times, surface-wave dispersion curves, full waveforms, and normal-mode spectra. Particular consideration is given to the inclusion of anisotropy (radial, azimuthal, and general) in the model parameterization and inversion. Models and derived data sets are available on the investigators' web site.--