TY - JOUR
T1 - Gradient maps
T2 - A tool in the interpretation of tomographic images
AU - Fishwick, S.
PY - 2006/6/16
Y1 - 2006/6/16
N2 - Gradient maps are introduced as a tool for the interpretation of tomographic images. The interpretation of tomographic images can be strongly dependent on the choice of reference models or a particular colour scale, but the gradient maps provide an image that is independent of the reference model. Incorporating new data in central and eastern Australia to update a surface wave tomography model, the horizontal gradient is calculated using a finite difference approximation. Results at 175 km depth clearly show that the gradient maps give information that may be missed in the simple interpretation of the change from fast to slow velocities highlighted in the tomographic images. It appears that there are a number of steps in the thickness of the lithosphere within eastern Australia.
AB - Gradient maps are introduced as a tool for the interpretation of tomographic images. The interpretation of tomographic images can be strongly dependent on the choice of reference models or a particular colour scale, but the gradient maps provide an image that is independent of the reference model. Incorporating new data in central and eastern Australia to update a surface wave tomography model, the horizontal gradient is calculated using a finite difference approximation. Results at 175 km depth clearly show that the gradient maps give information that may be missed in the simple interpretation of the change from fast to slow velocities highlighted in the tomographic images. It appears that there are a number of steps in the thickness of the lithosphere within eastern Australia.
KW - Australia
KW - Lithospheric boundaries
KW - Surface wave tomography
KW - Wavespeed gradients
UR - http://www.scopus.com/inward/record.url?scp=33646594113&partnerID=8YFLogxK
U2 - 10.1016/j.pepi.2006.02.003
DO - 10.1016/j.pepi.2006.02.003
M3 - Article
SN - 0031-9201
VL - 156
SP - 152
EP - 157
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
IS - 1-2
ER -