4. Given the stress tensor, whose elements are in kbar:
̑ = (
150 2 1
2 155 3
1 3 145
)
(a) What physical situation do the values represent?
(b) What is the mean stress?
(c) What is the deviatoric stress tensor?
(d) At what depth in the earth might this state of stress be found?
5. Download station coordinates from IRIS website (www.iris.edu) for the GSN network and plot them on map. Mark the station names.