Auxiliary material for Paper 2009GL040115

Scaling relations for seismic cycles on mid-ocean ridge transform faults

Margaret S. Boettcher
Department of Earth Sciences, University of New Hampshire, Durham, New Hampshire, USA

Jeffrey J. McGuire
Department of Marine Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA	


Boettcher, M. S., and J. J. McGuire (2009), Scaling relations for seismic cycles on mid-ocean ridge transform faults, Geophys. Res. Lett., 36, L21301, doi:10.1029/2009GL040115.

The auxiliary material contains two figures, which show relative relocations of earthquakes on the Gofar and Blanco transform faults.  The results shown in Figures S1 and S2 are summarized in Table 1 of the text.  In each case we find that two Mw > 6 earthquakes have overlapping ruptures.  

2009gl040115-fs01.pdf
Figure S1.  Top panel: Rayleigh waves for the 2003 (gray) and 2008 (black) Gofar Transform earthquakes at GSN stations.  Bottom panel shows differential arrival time measurements (gray circles) and fits (black circles) for the optimal estimate of the separation between the event centroids (3.7 km at an azimuth of 100 degrees).  The centroids of the two earthquakes are indistinguishable. 

2009gl040115-fs02.pdf
Figure S2.  Top panel: Rayleigh waves for the 1985 (gray) and 2000 (black) Blanco Transform earthquakes at GSN stations.  Bottom panel shows differential arrival time measurements (gray circles) and fits (black circles) for the optimal estimate of the separation between the event centroids (3.7 km at an azimuth of 85 degrees).  The centroids of the two earthquakes are indistinguishable.