Exploring Planet Earth. Blind Thrust Fault Earthquak

1
Blind Thrust Fault Earthquake Rupture Animation
(Northridge, 1994) Brad Aagaard,
USGS http//pasadena.wr.usgs.gov/office/baagaard/r
esearch/animations/animations.html The fault
rupture will be visible in the animation.
Displacements (magnified 3000 times) will be
visible by the movement of the mesh from the
model. The amplitude of motions and seismic
waves is color coded according to ground velocity.
http//web.ics.purdue.edu/braile/new/AagaardBlind
ThrustAnimation.ppt
Exploring Planet Earth
2
http//pasadena.wr.usgs.gov/office/baagaard/resear
ch/animations/animations.html
Exploring Planet Earth
3
http//pasadena.wr.usgs.gov/office/baagaard/resear
ch/animations/animations.html
Animation from B. Aagaard (place in folder with
PPT may have to re-insert .gif file)
http//web.ics.purdue.edu/braile/new/BlindThrustS
lice.gif
4
Seismic/Eruption view of January 17, 1994 M6.7
Northridge earthquake Note color coded depths of
main shock and aftershocks that indicate a south
dipping fault
5
Seismic/Eruption cross section view of January
17, 1994 M6.7 Northridge earthquake Note color
coded depths of main shock and aftershocks that
indicate a south dipping fault
South
North
0
Aftershocks with depth fixed at 5 km not able
to determine depth accurately
10
Depth (km)
20
Main Shock
0
10
20
-10
-20
Distance (km)
6
Main shock and aftershocks of the 1989 M6.9 Loma
Prieta earthquake, map and cross section view
note approximately rectangular area of the fault
plane that slipped and the bi-lateral rupture
from deepest part of fault plane
Exploring Planet Earth