Mapping lateral variations in upper mantle attenuation by stackingPandPPspectra
نویسندگان
چکیده
منابع مشابه
Seismic-wave Attenuation and the State of the Upper Mantle
Seismic-wave Attenuation and the state
متن کاملLateral variation in upper mantle viscosity: role of water
Differences in the viscosity of the earth’s upper mantle beneath the western US (f 10–10 Pa s) and global average values based on glacial isostatic adjustment and other data (f 10–10 Pa s) are generally ascribed to differences in temperature. We compile geochemical data on the water contents of western US lavas and mantle xenoliths, compare these data to water solubility in olivine, and calcula...
متن کاملOxygen Isotope Variations of Basaltic Lavas and Upper Mantle Rocks
This chapter summarizes the oxygen isotope geochemistry of terrestrial basalts and their mantle sources, including the conceptual framework for interpreting such data and the phenomenology of known variations. In particular, the first section outlines the motivations for and first-order results of oxygen isotope studies of terrestrial and lunar basalts over the last 30 years; the second section...
متن کاملA study of large-scale lateral variations of P velocity in the upper mantle beneath western Europe
A large-scale three-dimensional inversion of teleseismic P wave arrival times from ISC bulletins is performed over the part of Europe extending from Scandinavia to the Alps, and down to a depth of 700 km. The inferred velocity variations are compared with those obtained previously for North America in a similar study (Romanowicz 1979). The models obtained manage to explain one third of the stan...
متن کاملModification of the lithospheric stress field by lateral variations in plate-mantle coupling
[1] The presence of deeply penetrating continental roots may locally increase the magnitude of basal shear tractions by up to a factor of 4 compared to a layered viscosity structure. Here we examine how these increases in mantlelithosphere coupling influence stress patterns in the overlying elastic lithosphere. By coupling a mantle flow model to a model for the elastic lithosphere, we show that...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 2002
ISSN: 0148-0227
DOI: 10.1029/2001jb001195