![]() Velocity is exceeded over an area of 2700 km2. The maximum peak-to-peak horizontal velocities exceed 1.5 m/sec over an area of only 200 km2 for the 30°-dipping fault (geometry similar to the Chi-Chi earthquake), whereas for the 60°- and 75°-dipping faults this In our simulations with a shallow hypocenter, Rupture propagates in the direction of a node in the shear-wave radiation pattern. Pulses associated with rupture directivity, because the rupture propagates perpendicular to the slip vector that is, the Rupture of a thrust fault (geometry similar in the Chi-Chi earthquake) minimizes the area subjected to large-amplitude velocity Strong shear-wave directivity requires that (1) the observer is located in the direction of rupture propagationĪnd (2) the rupture propagates parallel to the direction of the fault slip vector. The nature of the shear-wave directivity is the key factor in determining the size and distribution of the peak velocitiesĪnd displacements. Ground motions are computed for fiveįault geometries with different combinations of fault dip and rake angles and common values for the fault area and the average We study how the fault dip and slip rake angles affect near-source ground velocities and displacements as faulting transitionsįrom strike-slip motion on a vertical fault to thrust motion on a shallow-dipping fault.
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