Geophysics, Lecture Notes- Physics - Prof Gavin Bell 14

Geophysics, Lecture Notes- Physics - Prof Gavin Bell 14 -...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
PX266 Geophysics (2010/11) Lecture 13 Handout – Plate Tectonics Dr. Gavin Bell The basic concept of plate tectonics is that the Earth’s lithosphere is divided into a small number of nearly rigid plates (there are seven major plates and several more minor ones). Most of the deformation – stretching, folding and shearing – in the lithosphere takes place near the boundaries of the plates. Deformation well inside the plate boundaries is much smaller than deformations occurring at or near boundaries. A seismicity map neatly outlines many of the plate boundaries since most volcanism and earthquake activity occurs in regions of strong lithospheric deformation. The main points are: The generation of new plate material occurs by seafloor spreading, where new oceanic lithosphere is generated along active mid-ocean ridges. Once generated, the new ocean lithosphere forms part of a rigid plate which may or may not include continental material.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Geophysics, Lecture Notes- Physics - Prof Gavin Bell 14 -...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online