Interseismic deformation and geologic evolution of the Death Valley Fault Zone

摘要: [1] The Death Valley Fault Zone (DVFZ), located in southeastern California, is an active fault system with evolved pull-apart basin that has been deforming over the past 6 Myr. We present a study of interseismic motion and long-term stress accumulation rates to better understand nature both present-day loading conditions DVFZ. Using 3-D semi-analytic viscoelastic deformation model, combined geodetic velocities derived from Mobile Array GPS for Nevada Transtension (MAGNET) network Southern California Earthquake Center (SCEC) Crustal Motion Map version 4 (CMMv4) data, we establish parameters slip rate apparent locking depth four DVFZ segments. Our preferred model provides good fit data (1.0 mm/yr 1.5 RMS misfit fault-perpendicular fault-parallel directions, respectively) yields depths between 9.8–17.1 km strike-slip 3–7 also determine subsidence (0.5–0.8 mm/yr) extension (1.0–1.2 region. With these parameters, construct evolution last Myr recreates blocks involved formation geological structures Valley. Finally, using Coulomb our (0.25–0.49 MPa/100 yr), earthquake recurrence interval estimates 500 2600 years, assess seismic hazards calculated moment magnitudes ranging 6.7–7.7.