Simulation and observations of complex interacting fault systems
Convenors: S. Jaume (Australia), J. Rundle (USA)
Session Overview: Steven C. Jaume, QUAKES (15 minutes)
Earthquakes do not occur in isolation from one another, but they and the faults upon which they occur form a complex web of interacting elements. The objective of Session 2.3 is to explore the means by which earthquakes and faults interact and how this effects the dynamics of earthquake occurrence and the resulting space-time patterns of seismicity. We will explore three main topics during this session:
1. Long/short range interactions versus long/short range correlations in interacting fault systems
Many simulation models of the earthquake process show highly complex behavior even though they include only nearest-neighbor interactions among the model elements. However, observations of earthquake triggering suggest interactions at distances far greater than an earthquake rupture length.
2. Application of frictional relationships to stress transfer and dynamic triggering
Early attempts to model earthquake and fault interactions assumed a simple Coulomb failure criteria for stress transfer. However, laboratory derived frictional relationships show that the failure strength on fault surfaces can be highly dependent upon their loading history. This topic will explore the application of these frictional relationships to the triggering/shadowing of future earthquake occurrence.
3. Dependance of spatio-temporal seismicity patterns upon the structure of interacting fault systems
Natural fault systems show a high degree of heterogeniety in their structure, ranging from fairly simple systems with only one or a few active faults to complex regions with many active faults of different orientation and sense of slip. Active faults also come in a hierarchy of different sizes.
Session Plenary: (1 Hour)
Steven C. Jaume', QUAKES (30 minutes) Stress Transfer, Dynamic Triggering, and Stress Correlations: How Earthquake Occurrence Effects The Timing and Slip of Subsequent Earthquakes John Rundle, University of Colorado (30 minutes) The Origin of Space-Time Patterns and Correlations in Populations of Earthquakes: Self-Organization, Scaling, and the Role of GEM Models and Numerical Simulations
Detailed Session: (2.5 Hours)
1. Long/short range interactions versus long/short range correlations in interacting fault systems Chunsheng Lu, Victoria University of Wellington (15 minutes) Linked stress release model for spatio-temporal seismicity Discussion and Comments (30 minutes) 2. Application of frictional relationships to stress transfer and dynamic triggering Mitsuhiro Matsu'ura, University of Tokyo (15 minutes) (no title) Michael Blanpied, U.S. Geological Survey (15 minutes) Effect of stress history on earthquake timing Discussion and Comments (30 minutes) 3. Dependance of spatio-temporal seismicity patterns upon the structure of interacting fault systems Naoyuki Kato, Geological Survey of Japan (15 minutes) (Joint with 2.1) Effect of an outer-rise earthquake on seismic cycle of large interplate earthquakes estimated from an instability model based on friction mechanics Mengfen Xia, Chinese Academy of Sciences (15 minutes) (To be presented in Session 1.2) Sample-specificity and predictability of material failure Discussion and Comments (30 minutes)