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The emphasis of the Earthquake Physics Working Group (Group F) during 2000 will be on research which addresses (i) the theory and simulation of earthquake rupture in individual earthquakes and (ii) the evolution of space-time patterns of seismicity and stress. Proposals will be evaluated for their potential to lead to testable predictions, as well as for their potential to contribute to the scientific underpinnings of earthquake hazard assessment. The Working Group will also consider proposals for observational studies specifically targeted at the testing of such models.

Task F1: Theory and simulation of earthquake rupture. We invite proposals to model the dynamics of rupture and slip using realistic representations of fault geometry, fault zone structure and inhomogeneity, and fault zone mechanical properties. Examples of appropriate investigations include (a) earthquake rupture mode (i.e., crack versus pulse), (b) thrust dynamics and inertial decoupling, (c) rupture and rupture arrest at segment boundaries (e.g., bends and stepovers),(d) the effect of heterogeneity of dynamic stresses on rupture and slip, (e) effects of material and rheological interfaces on rupture and slip, (f) earthquake nucleation processes, and (g) fault-zone healing processes. Consideration will be given to projects which use observations from recent large earthquakes to test and assess earthquake models.

Task F2: Theory and simulation of space-time evolution of seismicity and stress. We invite proposals to model the evolution of earthquake sequences, fault zone and fault network structure, and regional stress fields. Examples of appropriate investigations include those which address (a) the origins of complexity in repeated ruptures, (b) evolution and mechanical behavior of fault systems, (c) nature and origin of long-range stress correlations and fluctuations, and (d) nature and origin of accelerated moment release. Consideration will be given to projects which use observations from recent large earthquakes to test and assess models.

Task F3: Legacy document. We encourage proposals to summarize and integrate the major SCEC achievements in earthquake physics. The chapter devoted to earthquake physics includes achievements in the following areas: (a)Imaging fault structure and properties. (b) Observational constraints on source dynamics. (c) Theory and simulation of individual earthquakes. (d) Theory and simulation of space-time seismicity and stress patterns.