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- Per Bak, Kim Christensen, Leon Danon, Tim Scanlon
- Physical review letters
- 2002

We show that the distribution of waiting times between earthquakes occurring in California obeys a simple unified scaling law valid from tens of seconds to tens of years. The short time clustering,… (More)

- Ole Peters, Christopher Hertlein, Kim Christensen
- Physical review letters
- 2002

We show that rain events are analogous to a variety of nonequilibrium relaxation processes in Nature such as earthquakes and avalanches. Analysis of high-resolution rain data reveals that power laws… (More)

- Ole Peters, Kim Christensen
- Physical review. E, Statistical, nonlinear, and…
- 2002

We demonstrate how, from the point of view of energy flow through an open system, rain is analogous to many other relaxational processes in nature such as earthquakes. By identifying rain events as… (More)

- Kim Christensen, Nicholas R. Moloney, Ole Peters, Gunnar Pruessner
- Physical review. E, Statistical, nonlinear, and…
- 2004

Self-organized criticality can be translated into the language of absorbing state phase transitions. Most models for which this analogy is established have been investigated for their absorbing state… (More)

- Kim Christensen, Leon Danon, Tim Scanlon, Per Bak
- Proceedings of the National Academy of Sciences…
- 2002

We propose and verify a unified scaling law that provides a framework for viewing the probability of the occurrence of earthquakes in a given region and for a given cutoff magnitude. The law shows… (More)

Previous studies have found broad distributions, resembling power laws for different measures of the size of rainfall events. We investigate the large-event tail of these distributions and find in… (More)

- Matthew Stapleton, Kim Christensen
- Physical review. E, Statistical, nonlinear, and…
- 2005

A general n-state directed "sandpile" model is introduced. The stationary properties of the n-state model are derived for n<infinity, and analytical arguments based on a central limit theorem show… (More)

- Per Bak, Kim Christensen, Leon Danon, Tim Scanlon
- Physical review letters
- 2003

We derive the steady state properties of a general directed ‘sandpile’ model in one dimension. Using a central limit theorem for dependent random variables we find the precise conditions for the… (More)

- Kim Christensen, D Hamon, Henrik Jeldtoft Jensen, Stefano Lise
- Physical review letters
- 2001