Exciting news! We're transitioning to the Statewide California Earthquake Center. Our new website is under construction, but we'll continue using this website for SCEC business in the meantime. We're also archiving the Southern Center site to preserve its rich history. A new and improved platform is coming soon!

Natural Time and Earthquake Aftershock Entropy

Alexis Giguere

Published August 14, 2017, SCEC Contribution #7624, 2017 SCEC Annual Meeting Poster #079

Driven threshold systems are characterized by cascading events or bursts that tend to be strongly clustered in linear (clock) time. As a result, a useful framework to analyze these events is the concept of event count, or “natural time”. For naturally occurring driven threshold system like earthquakes, natural time has been used to analyze nucleation and critical phenomena, as well as a variety of other phenomena. We apply this concept to the study of entropy of earthquake aftershocks. Using the 2004 Parkfield, California sequence, we find that there are systematic changes in entropy throughout the earthquake cycle of foreshocks, mainshock and aftershocks. These changes may be indicative of processes that could allow discrimination of small earthquakes as indicators of the current state of the earthquake cycle.

Key Words
natural time, entropy, ergodicity

Citation
Giguere, A. (2017, 08). Natural Time and Earthquake Aftershock Entropy. Poster Presentation at 2017 SCEC Annual Meeting.


Related Projects & Working Groups
Seismology