Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3483
AuthorsMusumeci, C.* 
Gresta, S.* 
Malone, S.* 
TitleMagma System Recharge of Mount St. Helens (USA) from precise relative hypocenter location of microearthquakes
Issue Date2002
Series/Report no.B10/107 (2002)
DOI10.1029/2001JB000629
URIhttp://hdl.handle.net/2122/3483
Keywordsmagma
hypocenter
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
AbstractFour hundred forty-seven well-recorded earthquakes at Mount St. Helens during the late 1990s are relocated with high precision using a combination of a cross-correlation technique and then a procedure to obtain a one-dimensional velocity structure solution together with station corrections. The resulting high-resolution pattern of the spatialtemporal evolution of the earthquake activity, along with focal mechanisms of events provide additional evidence for the presence of a magma reservoir in the depth range 5.5– 10 km, connected to the surface by a thin vertical conduit. Moreover, the distribution of the events below 5.5 km yielded a much clearer view of the structures that generate the seismicity at that depth. Some of the deeper events occur along a sequence of faults under the influence of a radial stress field; however, a large number of the events occur on a NNE-SSW striking steeply dipping fault with slip consistent with magma being periodically injected into a truncated dike on the northwest side of this fault.
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