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Distributed Deformation Adjacent to Active Strike Slip Faults - Examples from the Eastern California Shear Zone. Acknowledgments: Dr. Mike Oskin, Dr. Jonathan Lees, Dr. Allen Glazner, Dr. Elizabeth Cochran, Dr. Yuri Fialko, Dr. Joe Kirschvink, Dr.Brad Singer, Dr. Xifan Zhang, Dr. Jim Casidy,

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slide1

Distributed Deformation Adjacent to Active Strike Slip Faults - Examples from the Eastern California Shear Zone

Acknowledgments:

Dr. Mike Oskin, Dr. Jonathan Lees, Dr. Allen Glazner, Dr. Elizabeth Cochran, Dr. Yuri Fialko, Dr. Joe Kirschvink, Dr.Brad Singer, Dr. Xifan Zhang, Dr. Jim Casidy,

Neta Bar,Richard Lease, Dolev Shelef, Mariana Vale, Mike Strane, Tomer Ben-David,

Kim Le, Scott Bennet, Jacob Selander, Sabrina Belknap, Emily Gurney.

SCEC, NSF, Martin Fund.

slide2

Motivation – transient strain accumulation across the Mojave

Geodetic: 10 - 14 mm/yr

Geologic: faults + distributed displacement

slide3

Real offset

Is that all ?

  • Questions –
  • how much?
  • how wide?
  • How distributed?
  • how active?
  • How (mechanism)?
slide4

How

(After Nelson and Jones, 1987)

slide6

Mylonitic lineation direction-

Predates strike slip faulting

(Fletcher et al., 1995)

slide7

Block rotation

  • Width of rotation zone
  • ~20% of total displacement
  • Block size as function of distance from the fault
  • Ratio of secondary faults to the main fault

2σ = ~20°.

slide8

Block dimensions

Distance from fault (m)

Distance from fault (m)

slide9

Y=16+0.7x

R2=0.87

Block size decrease towards fault

Radius of largest possible block (m)

slide10

Secondary faults length

≅12

main fault length

  • Order of magnitude greater length than main fault
  • Accommodates up to 20% of displacement
  • Active? – seismic energy sink
slide11

paleomagnetism

  • Pre/post faulting
  • Faults of different displacement
slide12

How come?

  • Different mechanisms
  • Spatial changes in magnitude

No significant rotation

slide16

752110 ka

725  85m

2000m

2000m

16329 ka

~100m

Distributed faulting cutting lava flows of different age, Pisgah fault

slide17

Summary :

  • Mechanisms: block rotation and offset along secondary faults
  • Width: 0-2 km
  • Activity: probably active
  • Magnitude: up to 20%
  • 5. All may change along fault strike.
slide18

Acknowledgments:

Dr. Mike Oskin, Dr. Jonathan Lees, Dr. Allen Glazner, Dr. Elizabeth Cochran, Dr. Yuri Fialko, Dr. Joe Kirschvink, Dr.Brad Singer, Dr. Xifan Zhang, Dr. Jim Casidy,

Neta Bar,Richard Lease, Dolev Shelef, Mariana Vale, Mike Strane, Tomer Ben-David,

Kim Le, Scott Bennet, Jacob Selander, Sabrina Belknap, Emily Gurney.

SCEC, NSF, Martin Fund.

The end

slide19

Questions

  • What may determine rotation vs. displacement along secondary faults
  • Relations to fault geometry
  • What happens at depth?
  • What determines where OFD occurs and where not
  • Scaling: ECSZ vs. Harper Lake
  • Difference between dike and Harper Lake in terms of faults density
  • Too beautiful trend of block size
  • Affects on geomorphology – ideas:which geomorphic indicators will suggest active OFD zone.
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