@article {Ranero2008,
	title = {{Hydrogeological system of erosional convergent margins and its influence on tectonics and interplate seismogenesis}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {9},
	number = {3},
	year = {2008},
	month = {mar},
	pages = {n/a{\textendash}n/a},
	abstract = {Fluid distribution in convergent margins is by most accounts closely related to tectonics. This association has been widely studied at accretionary prisms, but at half of the Earth{\textquoteright}s convergent margins, tectonic erosion grinds down overriding plates, and here fluid distribution and its relation to tectonics remain speculative. Here we present a new conceptual model for the hydrological system of erosional convergent margins. The model is based largely on new data and recently published observations from along the Middle America Trench offshore Nicaragua and Costa Rica, and it is consistent with observations from other erosional margins. The observations indicate that erosional margins possess previously unrecognized distinct hydrogeological systems: Most fluid contained in the sediment pores and liberated by early dehydration reactions drains from the plate boundary through a fractured upper plate to seep at the seafloor across the slope, rather than migrating along the d{\'e}collement toward the deformation front as described for accretionary prisms. The observations indicate that the relative fluid abundance across the plate-boundary fault zone and fluid migration influence long-term tectonics and the transition from aseismic to seismogenic behavior. The segment of the plate boundary where fluid appears to be more abundant corresponds to the locus of long-term tectonic erosion, where tectonic thinning of the overriding plate causes subsidence and the formation of the continental slope. This correspondence between observations indicates that tectonic erosion is possibly linked to the migration of overpressured fluids into the overriding plate. The presence of overpressured fluids at the plate boundary is compatible with the highest flow rates estimated at slope seeps. The change from aseismic to seismogenic behavior along the plate boundary of the erosional margin begins where the amount of fluid at the fault declines with depth, indicating a control on interplate earthquakes. A previously described similar observation along accreting plate boundaries strongly indicates that fluid abundance exerts a first-order control on interplate seismogenesis at all types of subduction zones. We hypothesize that fluid depletion with depth increases grain-to-grain contact, increasing effective stress on the fault, and modifies fault zone architecture from a thick fault zone to a narrower zone of localized slip. Copyright 2008 by the American Geophysical Union.},
	keywords = {fluid flow, Seismogenesis, subduction zones, Tectonic erosion},
	issn = {15252027},
	doi = {10.1029/2007GC001679},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-67349265252\&partnerID=tZOtx3y1},
	author = {Ranero, C. R. and Grevemeyer, I. and Sahling, H. and Barckhausen, U. and Hensen, C. and Wallmann, K. and Weinrebe, W. and Vannucchi, P. and von Huene, R. and McIntosh, K.}
}
@article {PhippsMorgan2008,
	title = {{Intra-arc extension in Central America: Links between plate motions, tectonics, volcanism, and geochemistry}},
	journal = {Earth and Planetary Science Letters},
	volume = {272},
	number = {1-2},
	year = {2008},
	pages = {365{\textendash}371},
	abstract = {This study revisits the kinematics and tectonics of Central America subduction, synthesizing observations of marine bathymetry, high-resolution land topography, current plate motions, and the recent seismotectonic and magmatic history in this region. The inferred tectonic history implies that the Guatemala-El Salvador and Nicaraguan segments of this volcanic arc have been a region of significant arc tectonic extension; extension arising from the interplay between subduction roll-back of the Cocos Plate and the \~{} 10-15mm/yr slower westward drift of the Caribbean plate relative to the North American Plate. The ages of belts of magmatic rocks paralleling both sides of the current Nicaraguan arc are consistent with long-term arc-normal extension in Nicaragua at the rate of \~{} 5-10mm/yr, in agreement with rates predicted by plate kinematics. Significant arc-normal extension can {\textquoteright}hide{\textquoteright} a very large intrusive arc-magma flux; we suggest that Nicaragua is, in fact, the most magmatically robust section of the Central American arc, and that the volume of intrusive volcanism here has been previously greatly underestimated. Yet, this flux is hidden by the persistent extension and sediment infill of the rifting basin in which the current arc sits. Observed geochemical differences between the Nicaraguan arc and its neighbors which suggest that Nicaragua has a higher rate of arc-magmatism are consistent with this interpretation. Smaller-amplitude, but similar systematic geochemical correlations between arc-chemistry and arc-extension in Guatemala show the same pattern as the even larger variations between the Nicaragua arc and its neighbors. {\textcopyright} 2008 Elsevier B.V. All rights reserved.},
	keywords = {arc geochemistry, Central America, extension, magmatism, Plate Tectonics},
	issn = {0012821X},
	doi = {10.1016/j.epsl.2008.05.004},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-47749095517\&partnerID=tZOtx3y1},
	author = {Phipps Morgan, J. and Ranero, C.R. and Vannucchi, P.}
}
