This monograph provides an overview of the progress made in illuminating the properties of deep slabs and the surrounding mantle, since the introduction of the plate tectonics model to the earth sciences 25 years ago. The thermal and chemical characteristics of the subducted lithosphere are determined through thermal and petrological modelling, with seismological observations providing critical constraints on model parameters. Down-wellings of the oceanic lithosphere play a critical role in plate tectonics by recycling to the mantle material that has risen at mid-ocean ridges and cooled at the Earth's surface. To assist future efforts in developing detailed thermal and petrological models of oceanic lithosphere down-wellings, this volume includes a review of seismological observations and models. A range of seismological procedures are considered, from travel time constraints on seismic velocity anomalies in the subducting lithospheric slabs, to wave conversions and reflections of internal and external slab boundaries. A reference list is included for earth science researchers and seismological specialists which lists most of the critical literature on slab structure.
- Limba : Engleza
- Cuprins : Introduction: slabs and mantle convection; how seismology provides information about slabs; earthquakes in slabs. General characterization of slab and wedge structures: first-order slab anomalies; guided waves; wedge structure; thermal and mechanical models. Travel time pattern constraints on slab velocity structure: relative time patterns and ray-tracing analyses; residual sphere modelling. Tomographical imaging of slab velocity structure - northwest Pacific, southwest Pacific, South America, Central America, the Caribbean, Cascadia, Aleutians, Alaska, Mediterranean and Hindu Kush: slab boundaries - converted and reflected phases, slab seismocity and double Benioff zones; constraints on slab boundaries and internal structure; seismic imaging of phase boundaries in slabs. Focusing, multipathing, and diffraction effects of slab structure: short-period defocusing and multipathing effects; long-period defocusing and diffraction effects. Future direction in slab imaging.
- Data Publicarii : 05 Sep 1994
- Format : Hardback
- Numar pagini : 185
- ISBN : 9780120188352