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Rapid estimation of rupture directivity: Application to the 1992 Landers (M S = 7.4) and Cape Mendocino (M S = 7.2), California earthquakes
Author(s) -
Ammon Charles J.,
Velasco Aaron A.,
Lay Thorne
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl03032
Subject(s) - geology , seismology , fault plane , directivity , thrust fault , slip (aerodynamics) , fault (geology) , thrust , telecommunications , physics , computer science , antenna (radio) , thermodynamics
Using empirical Green functions with regional and teleseismic surface waves, it is possible to resolve fault finiteness effects, in many cases uniquely defining the fault plane for relatively large earthquakes. The technique requires very little data processing and can be applied in near‐real time with the current distribution of seismic stations. The Landers strike‐slip earthquake was dominated by two sub‐events with predominantly north‐northwestward rupture. The second sub‐event was 1.5 times larger and rotated in strike by 12° counterclockwise relative to the first. The Cape Mendocino thrust event had a relatively smooth rupture that propagated to the southwest on a shallow dipping fault.