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Are stress drop and rupture velocity of earthquakes independent? Insight from observed ground motion variability
Author(s) -
Causse Mathieu,
Song Seok Goo
Publication year - 2015
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 - 10.1002/2015gl064793
Subject(s) - geology , ground motion , peak ground acceleration , drop (telecommunication) , seismology , geodesy , independence (probability theory) , spatial variability , acceleration , physics , mathematics , statistics , engineering , classical mechanics , telecommunications
We demonstrate that the variability of the peak ground acceleration (PGA) generated by earthquakes can be simply related to the variability of stress drop (Δ τ ), rupture velocity ( V r ) and their correlation. By compiling recent observations of variability of Δ τ and V r , we show that the hypothesis of independence between Δ τ and V r leads to an overestimation of the PGA variability. We suggest that Δ τ and V r must be anticorrelated so as to match recent observations of PGA variability.