Stronger peak ground motion, beyond the threshold to initiate a response, does not lead to larger stream discharge responses to earthquakes

Geophysical Research Letters
By: , and 

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Abstract

The impressive number of stream gauges in Chile, combined with a suite of past and recent large earthquakes, makes Chile a unique natural laboratory to study several streams that recorded responses to multiple seismic events. We document changes in discharge in eight streams in Chile following two or more large earthquakes. In all cases, discharge increases. Changes in discharge occur for peak ground velocities greater than about 7–11 cm/s. Above that threshold, the magnitude of both the increase in discharge and the total excess water do not increase with increasing peak ground velocities. While these observations are consistent with previous work in California, they conflict with lab experiments that show that the magnitude of permeability changes increases with increasing amplitude of ground motion. Instead, our study suggests that streamflow responses are binary.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Stronger peak ground motion, beyond the threshold to initiate a response, does not lead to larger stream discharge responses to earthquakes
Series title Geophysical Research Letters
DOI 10.1029/2018GL078621
Volume 45
Issue 13
Year Published 2018
Language English
Publisher AGU
Contributing office(s) Geologic Hazards Science Center
Description 9 p.
First page 6523
Last page 6531
Country Chile