“…Common examples include the aftershock sequences triggered by large crustal earthquakes [e.g., Freed and Lin , 2001; Helmstetter et al , 2006], seismic swarms [e.g., Dieterich , 1992; Vidale and Shearer , 2006; Vidale et al , 2006], and long‐term seismic cycles on major plate boundaries [e.g., Dieterich , 1994; Lapusta et al , 2000]. The stressing rate changes associated with seismic swarms are often explained as a response to fault creep, fluid or magmatic events [e.g., Hill et al , 1975; Smith et al , 2004; Hainzl and Ogata , 2005; McGuire et al , 2005; Vidale and Shearer , 2006; Vidale et al , 2006], and have been exploited for evaluating earthquake triggering models in magmatically dominated environments [e.g., Dieterich et al , 2000; Toda et al , 2002]. Davis et al [2001, 2004] use borehole pressure transients to infer that aseismic spreading processes trigger earthquake swarms along the Juan de Fuca ridge, but no geodetic observations exist to verify this hypothesis.…”