Woods Hole Oceanographic Institution

Jeff J. McGuire

»Gofar Transform Earthquakes

The Network Strain Filter - A New Tool for Monitoring and Detecting Transient Deformation Signals in GPS Arrays


Scaling Relations for Seismic Cycles on Mid-Ocean Ridge Transform Faults

»Earthquake Swarms on Transform Faults
»Modeling Seismic Swarms Triggered by Aseismic Transients
»Analysis of Seafloor Seismograms of the 2003 Tokachi­Oki
  Earthquake Sequence for Earthquake Early Warning

»Seismic Cycles
»Fore-arc structure and subduction zone earthquakes
»Salton Trough Swarms
»Earthquake Predictability
»SEAJADE Experiment

R. B. Lohman and J. J. McGuire, Earthquake swarms driven by aseismic creep in the Salton Trough, California, J. Geophys. Res, 2007

In late August 2005, a swarm of more than a thousand earthquakes between magnitudes 1 and 5.1 occurred at the Obsidian Buttes, near the southern San Andreas Fault. This swarm provides the best opportunity to date to assess the mechanisms driving seismic swarms along transform plate boundaries. The recorded seismicity can only explain 20% of the geodetically observed deformation, implying that shallow, aseismic fault slip was the primary process driving the Obsidian Buttes swarm. Models of earthquake triggering by aseismic creep can explain both the time history of seismic activity associated with the 2005 swarm and the 1 km/h migration velocity exhibited by this and several other Salton Trough earthquake swarms. A combination of earthquake triggering models and denser geodetic data should enable significant improvements in time-dependent forecasts of seismic hazard in the key days to hours before significant earthquakes in the Salton Trough.

FILE » Lohman_McGuire_2007_31583.pdf

© Woods Hole Oceanographic Institution
All rights reserved