Hector Mine, California Earthquake
October 16, 1999

Photos courtesy of Paul "Kip" Otis-Diehl, USMC, 29 Palms.
Captions courtesy of Ken Hudnut, USGS, Pasadena.

#02
#02 - Looking towards NW across Lavic Lake, rupture passing from lower right, stepping out toward upper left; NW end of the surface rupture is in the distance on the far side of Lavic Lake.
#03
#03 - cracks on far side of wash. These we call 'en-echelon' breaks where they step sideways
#04
#04 - splaying of fractures viewed from above
#05
#05 - Southeast of maximum displacement site. Here we see 3-4 meters of right-lateral slip have offset a ridge and created a 'shutter' ridge blocking flow in the dry creek channel. The white vertical surface is the fault scarp.
#06
#06 - fractures crossing a wash
#07
#07 - view right along the main rupture zone, and also visible is a subsidiary fracture from lower right corner coalescing with the main break in the middle distance.
#08
#08 - View downward onto vehicle tracks crossing the fault at a high angle. One can see 2.5 to 3.5 meter right-lateral displacement of the tracks.
#09
#09 - Fracture running along hillside in low-relief topography with offset gullies and tracks
#10
#10 - Ground view along surface rupture, showing the fracturing of the soil and how pieces have been pushed up within the fault zone.
#11
#11 - Subparallel breaks coalesce on face of hill (in shadow) and form a single rupture heading off to the upper left
#12
#12 - Downward view onto gullies, gravel bar, and other laterally offset features. Here slip appears to be about 2 meters
#13
#13 - rupture cutting across the countryside in loose alluvium
#14
#14 - breaks cutting alluvium, nicely lit
#15
#15 - View downward onto site with maximum observed lateral displacement along the Lavic Lake fault. Here a vehicle track and dry creek bed are laterally offset by approx. 370-480 centimeters. The orientation of fractures here is nearly North-South. Compression locally across the fault pushed up a 'mole track' where the fault breaks the dirt road at the right side of the photo.
#16
#16 - fracture cutting across the countryside
#17
#17- fracture cutting across the countryside (left to right) such that fault scarp is lit up by the sun, appearing as a bold white line
#18
#18 - 'Mole track' at the max. slip site from the ground
#19
#19 - view towards south across Lavic Lake, with the surface rupture running from lower right to upper left. In the middle distance on the right is an ancient lava flow
#20
#20 - splayed fractures running through loose alluvium
#21
#21 - 'apparent' vertical displacement and scarps caused by mainly lateral slip
#22
#22 - same as 21