@article {Lefeldt2012,
	title = {{Seismic evidence of tectonic control on the depth of water influx into incoming oceanic plates at subduction trenches}},
	journal = {Geochemistry Geophysics Geosystems},
	volume = {13},
	number = {5},
	year = {2012},
	month = {may},
	pages = {Q05013},
	abstract = {Water transported by slabs into the mantle at subduction zones plays key roles in tectonics, magmatism, fluid and volatiles fluxes, and most likely in the chemical evolution of the Earth{\textquoteright}s oceans and mantle. Yet, incorporation of water into oceanic plates before subduction is a poorly understood process. Several studies suggest that plates may acquire most water at subduction trenches because the ocean crust and uppermost mantle there are intensely faulted caused by bending and/or slab pull, and display anomalously low seismic velocities. The low velocities are interpreted to arise from a combination of fluid-filled fractures associated to normal faulting and mineral transformation by hydration. Mantle hydration by transformation of nominally dry peridotite to water-rich serpentinite could potentially create the largest fluid reservoir in slabs and is therefore the most relevant for the transport of water in the deep mantle. The depth of fracturing by normal-fault earthquakes is usually not well constrained, but could potentially create deep percolation paths for water that might hydrate up to tens of kilometers into the mantle, restrained only by serpentine stability. Yet, interpretation of deep intraplate mineral alteration remains speculative because active-source seismic experiments have sampled only the uppermost few kilometers of mantle, leaving the depth-extent of anomalous velocities and their relation to faulting unconstrained. Here we use a joint inversion of active-source seismic data, and both local and regional earthquakes to map the three dimensional distribution of anomalous velocities under a seismic network deployed at the trench seafloor. We found that anomalous velocities are restrained to the depth of normal-fault micro-earthquake activity recorded in the network, and are considerably shallower than either the rupture depth of teleseismic, normal-fault earthquakes, or the limit of serpentine stability. Extensional micro-earthquakes indicate that each fault in the region slips every 2-3months which may facilitate regular water percolation. Deeper, teleseismic earthquakes are comparatively infrequent, and possibly do not cause significant fracturing that remains open long enough to promote alteration detectable with our seismic study. Our results show that the stability field of serpentine does not constrain the depth of potential mantle hydration. Copyright 2012 by the American Geophysical Union.},
	keywords = {Bending, Microseismicity, Oceanic plates, serpentinization, Subduction zone, Water influx},
	issn = {1525-2027},
	doi = {10.1029/2012GC004043},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84861357079\&partnerID=tZOtx3y1},
	author = {Lefeldt, M. and Ranero, C. R. and Grevemeyer, I.}
}
@article {Grevemeyer2007,
	title = {{Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench}},
	journal = {Earth and Planetary Science Letters},
	volume = {258},
	number = {3-4},
	year = {2007},
	month = {jun},
	pages = {528{\textendash}542},
	abstract = {Water transported within the subducting oceanic lithosphere into the Earth{\textquoteright}s interior affects a wealth of subduction zone processes, including intraslab earthquakes and arc magmatism. In recent years growing evidence suggests that much of the hydration of oceanic plates occurs at the trench-ocean slope right before subduction. Here, normal faults are created while the rigid lithosphere bends into the trench. Offshore of Middle America, multi-channel seismic reflection imaging suggests that bending-related faults cut into the uppermost mantle, providing a mechanism for hydration and transformation of mantle peridotites into serpentinites. Seismic wide-angle reflection and refraction data were collected coincident with one of the seismic profiles where the faults have been imaged. Travel time inversion provides evidence that both crustal and uppermost mantle velocities are reduced with respect to the velocity structure found in mature oceanic crust away from deep-sea trenches. If mantle velocity reduction is solely produced by hydration, velocities indicate 10-15\% of serpentinization in the uppermost 3~km of the mantle, where seismic data provide enough resolution. A small network of ocean bottom hydrophones, deployed for about a month, detected \~{} 3 local micro earthquakes per day. Earthquake epicentres align with fault scarps at the seafloor and continuous earthquake activity might be an important process to facilitate the percolation of seawater into the upper mantle. {\textcopyright} 2007 Elsevier B.V. All rights reserved.},
	keywords = {bending-related normal faulting, earthquakes, global water cycle, seismic refraction, serpentinization, subduction},
	issn = {0012821X},
	doi = {10.1016/j.epsl.2007.04.013},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-34249911517\&partnerID=tZOtx3y1},
	author = {Grevemeyer, Ingo and Ranero, Cesar R. and Flueh, Ernst R. and Kl{\"a}schen, Dirk and Bialas, J{\"o}rg}
}
