Physics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3603303n&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 3, CiteID L03303
Physics
12
Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413), Seismology: Oceanic Crust, Seismology: Tomography (6982, 8180)
Scientific paper
We perform travel-time tomography to estimate detailed seismic velocity structures in the crust of the Pacific slab from northeastern (NE) Japan to the Kanto district, Japan, and reveal that the depth extent of the low-velocity (hydrated) oceanic crust varies along the arc. The low-velocity oceanic crust is subducting to depths of 120-150 km beneath Kanto, which is 40-70 km deeper compared to NE Japan. Such deeper preservation of the low-velocity oceanic crust beneath Kanto can be explained by lower-temperature conditions in the Pacific slab as a result of the subduction of the Philippine Sea slab immediately above it. These observations suggest that dehydration reactions accompanied by large velocity changes are controlled principally by temperatures, not by pressures. We also find spatial correspondence between intensive seismicity in the oceanic crust and the disappearance depth of the low-velocity oceanic crust, suggesting that breakdown of hydrous minerals triggers earthquakes in the oceanic crust.
Hasegawa Akira
Nakajima Jun'ichi
Tsuji Yusuke
No associations
LandOfFree
Seismic evidence for thermally-controlled dehydration reaction in subducting oceanic crust does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Seismic evidence for thermally-controlled dehydration reaction in subducting oceanic crust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seismic evidence for thermally-controlled dehydration reaction in subducting oceanic crust will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-916315