scholarly journals Dynamic geometrical effects on strong ground motion in a normal fault model

1999 ◽  
Vol 104 (B1) ◽  
pp. 809-815 ◽  
Author(s):  
James N. Brune ◽  
Abdolrasool Anooshehpoor
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Normal Fault ◽  
Fault Model ◽  
Geometrical Effects ◽  
Strong Ground

A fault model with variable slip duration for the 1989 Loma Prieta, California, earthquake determined from strong-ground-motion data

1996 ◽  
Vol 86 (1A) ◽  
pp. 122-132
Author(s):  
Stephen Horton
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Propagation Rate ◽  
Fault Model ◽  
Fault Surface ◽  
Loma Prieta Earthquake ◽  
Motion Data ◽  
Finite Fault ◽  
Loma Prieta ◽  
Strong Ground

Abstract A finite-fault model with variable slip duration is inferred from strong-ground-motion data for the Loma Prieta earthquake. Unlike previous models, slip duration is found to be consistent with fault width scaling. Slip duration varies between 1 and 6 sec at points along the fault surface with values between 3 and 6 sec, where slip amplitudes obtain or exceed the average slip of 98 cm. Modest high-frequency modifications of the slip function shape greatly enhance the data fit without significantly changing the inferred static offset or rupture characteristics. This model exhibits bilateral rupture with the propagation rate of the main energy release of 3 km/sec or less. The moment is 2.3 × 1026 dyne-cm, and the largest slip amplitudes occur northwest of the hypocenter. The rake varies with position along the fault from dominantly strike slip in the southeast to dominantly reverse slip in the northwest.

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