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Wildfires statistics for the conterminous United States (U.S.) are examined in a spatially and temporally explicit manner. We use a high-resolution data set consisting of 88,916 U.S. Department of Agriculture Forest Service wildfires over the time period 1970-2000 and consider wildfire occurrence as a function of ecoregion (land units classified by climate,(More)
We consider the frequency-size statistics of two natural hazards, forest fires and landslides. Both appear to satisfy power-law (fractal) distributions to a good approximation under a wide variety of conditions. Two simple cellular-automata models have been proposed as analogs for this observed behavior, the forest fire model for forest fires and the sand(More)
have to account for this observation. The realization of a variation in Fe/Si ratio among the terrestrial planets will also alter the details of our models of martian mantle chemistry and core formation scenarios. Models of core formation in the terrestrial planets cannot assume bulk C1 siderophile element abundances.sure Research. We are grateful to G.(More)
We review work on extreme events, their causes and consequences, by a group of European and American researchers involved in a three-year project on these topics. The review covers theoretical aspects of time series analysis and of extreme value theory, as well as of the determinis-tic modeling of extreme events, via continuous and discrete dynamic models.(More)
Keywords: Landscape fire-succession model Wildfire regime Succession-disturbance dynamics Mediterranean landscape Pattern-oriented modelling a b s t r a c t We present a spatially explicit Landscape Fire-Succession Model (LFSM) developed to represent Medi-terranean Basin landscapes and capable of integrating modules and functions that explicitly represent(More)
In 1906 the great San Francisco earthquake and fire destroyed much of the city. As we approach the 100-year anniversary of that event, a critical concern is the hazard posed by another such earthquake. In this article, we examine the assumptions presently used to compute the probability of occurrence of these earthquakes. We also present the results of a(More)
A record-breaking temperature is the highest or lowest temperature at a station since the period of time considered began. The temperatures at a station constitute a time series. After the removal of daily and annual periodicities, the primary considerations are trends (i.e., global warming) and long-range correlations. We first carry out Monte Carlo(More)