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The Northridge quake: 3 images to view and download a
mm slides
Wayne Thatcher
Ross Stein G. Marshall and R. Stein,
Serkan Bozkurt
Bill Hammond
A 3-slide set: maps of the Northridge, California, earthquak
deformations, USGS Open File Report, 94-442, 1994. (revis
Marleen Nyst
Tom Parsons
Fred Pollitz
Chuck Wicks
Visitors & Collaborators
Aykut Barka
Gerald Bawden
Thomas Dewez
Jian Lin
Takuya Nishimura
Shinji Toda
Tim Wright
earthquake struck on a 'blind thrust fault,' meaning that the fault is
the earth's surface (see Stein and Yeats 1989 for examples). The fi
aftershocks and ground cracking are shown. The surface faults act
M=6.7 San Fernando earthquake are also shown. This event also s
cutting faults thought to be active during the past 10,000 years are
conceal blind thrust faults like the one that ruptured in the Northri
The principal effects of the earthquake shaking are shown in the 'E
distribution of 'red-tagged' buildings (damaged to the point where
entry); bridge damage, landslides, ground cracking and surface fau
sand and water shot to the surface), and the region in which the pe
exceeded 0.4 g, the nominal design acceleration formerly used for
The permannent ground movement is shown in the 'Deformation'
Contours of predicted uplift are in blue and horizontal motions are
deformation was measured by GPS receivers are red triangles.The
uplifted 70 cm, or 2.3'.
3-Slides:
Effects of the earthquake:
[Preview 58kb] [High
resolution 180kb]
- Red tagged buildings
- Landslides
- Strong ground motion
Tectonic and seismic setting
of the quakes:
[Preview 44kb] [High
resolution 175kb]
- main shock and aftershocks
- known faults
- previous surface ruptures
The 35 mm slide set can also be mailed to you upon request free of
The High resolution images can be used for PowerPoint presentatio
images, for poster-size prints for instance, contact us.
Technical details for the slides:
Map Base:
The digitally shaded relief was produced from the USGS 1: 100,000
(DEM). Roads are from the U.S. Tiger files. Active Faults are from
Activity Map of California, California Division of Mines and Geolo
Stein and R. S. Yeats, 1989, Hidden Earthquakes, Scientific Americ
folds believed to be active during the past million years are depicted
Effects of the 1994 M=6.7 Northridge, California, Earthquake S
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1971 Surface Rupture corresponds to faulting associated wi
San Fernando earthquake, from Charles W. Jennings (1975)
Harp, E. L., and R. W. Jibson, Inventory of landslides trigge
California earthquake, U.S. Geol. Surv. Open-File Rep., 95Holzer, T. L., M. J. Bennett, J. C. T. III, D. J. Ponti, and R.

failure in alluvium during the Northridge, California, earthq
U.S.-Japan Workshop on Earthquake Resistant Design of Li
sures Against Soil Liquefaction, Tokyo: Nat. Cen. Earthqua
Hecker, S., D. Ponti, C. Garvin, T. Powers, T. Fumal, J. Ham
Prentice, and F. Cinti (1995). Ground deformation in Grana
resulting from the January 17, 1994, Northridge, California,
Open-File Rep. 95-62.
Deformation of the 1994 M=6.7 Northridge, California, Earthq
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K.M. Hodgkinson, R.S. Stein, K.W. Hudnut, J. Satalich, and
restoration of geodetic infrastructure caused by the 1994 No
U.S. Geol. Surv. Open-File Report 96-517 [1996] (text, map
internet at the site, http://www-socal.wr.usgs.gov/fema/.
Hudnut, K. W., Z. Shen, M. Murray, S. McClusky, R. King,
P. Fang, A. Donnellan, and Y. Bock ( 1996). Coseismic disp
Northridge, California, earthquake, Bull. Seis. Soc. Amer., 8
Wald, D. J., T. H. Heaton, and K. W. Hudnut (1996). The sl
California, earthquake determined from strong-motion, teles
Bull. Seismol. Soc. Amer. , 86, S49-S70 , 1996.
Damage associated with the Northridge, California, Earthquak
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Strong Shaking (peak horizontal acceleration > 0.4 g, or 40%
contoured from roughly 50 strong ground motion stations by
Borcherdt, Robert K. Mark, and David M. Boore (U.S.G.S.,
and in preparation. Strong motion recordings from Anthony
Sacramento), Mihailo D. Trifunac (U.S.C.), and Ronald L. P
Menlo Park and Pasadena).
Severely Damaged Buildings are blocks or individual buildi
by inspectors of the Federal Emergency Management Agenc
Emergency Services, the City and County of Los Angeles, a
Damaged (minor to major) and Collapsed bridges from Calt
Transportation), Division of Structures, Post Earthquake Inv
Buckle, I.G. (1994). The Northridge, California, earthquake
Performance of Highway Bridges, Tech. Rep. NCEER-94-0
Res., Buffalo.
Grant Marshall, now at SnapTrack, a QUALCOMM company, 675
Campbell CA, 95008,
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U.S. Geological Survey, Earthquake Hazards Program
URL http://quake.wr.usgs.gov/research/deformation/modeling/
Page maintained by Serkan Bozkurt
Contact: sbozkurt@usgs.gov
Last modification: June 28, 2002