Lecture 8 Notes: Elastic Stress Strain Relations
In elastic materials, stress is linearly related to strain, as opposed to viscous
materials, where stress is related to strain rate.
What is strain?
Consider a cube with sides of lengths x, y, z (all equal)
Lecture 5 Notes: Age of the Solar System (Patterson Paper)
Age of Meteorites and the earth
Division of Geological Sciences California Institute of Technology, Pasadena, California, USA
Received 23 January 1956
Lecture 6 Notes: Mass and Moment of Inertia
The masses of the planets were not known until the 17th century, when
Galileo, Kepler and Newton laid the groundwork for understanding the
dynamics of planetary bodies. In 1686, using Keplers laws of planetary
Lecture 7 Notes: Rheology and Seismology
Rheology of the Earth (and other Planets, but we know more about Earth)
The way that planets function internally and their topography and
surface features depend largely on the rhelogy of the planet interiors.
Lecture 10 Notes: Structure of the Planets
dm is the distance that the wave travels in the mantle, dc is the distance that it
travels in the core.
Using Snells law:
sin(90 o /2)
the sine law for triangles:
sin(180 o )
Lecture 9 Notes: Seismic Phases and Travel Times
Seismic body waves (P and S) travel through the crust, mantle
and cores of planetary bodies. These waves are given different names when
they travel through the core. P waves in the outer core are called K w
The Error Function
We will use the conduction equation in a few more classes to relate
lithospheric thickness to time and temperature so we might as well right
down one very useful time-dependent solution, called the error function and
Lecture 2 Notes: Solar System Formation
How do we think the solar system formed. Conditions and observations?
Sun formed out of collapse of giant molecular cloud.
Observations of molecular clouds 1 10 million MSun,10 30 K
Pressure = few thousand molecule