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Ground‐motion modelling at regional distances for earthquakes in a continental interior, II. Effect of focal depth, azimuth and attenuation
Author(s) -
Herrmann Robert B.,
Nuttli Otto W.
Publication year - 1975
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290040105
Subject(s) - attenuation , geology , azimuth , seismology , ground motion , geodesy , thrust , strong ground motion , microseism , physics , optics , thermodynamics
Multiple‐mode surface‐wave signals are used to model ground motion at distances of 50 to 500 km for an earthquake source in a continental interior. Motion on a thrust fault is used as the earthquake model. Theoretical ground‐motion time histories are generated for this source for various focal depths, receiver azimuths and medium‐attenuation models. A shallow source will generate greater values for the ground motion than the same source at a greater depth. Two anelastic attenuation models are considered, one appropriate to the central and eastern United States and the other to southern California. The effects of the difference in the attenuation models are seen at distances greater than 100 km for periods greater than 1.5 sec.