Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3110608r&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 10, CiteID L10608
Physics
17
Seismology: Lithosphere And Upper Mantle, Seismology: Oceanic Crust, Seismology: Seismicity And Seismotectonics, Tectonophysics: Dynamics, Seismotectonics, Tectonophysics: Plate Boundary-General (3040)
Scientific paper
High-precision relocations of intermediate-depth earthquakes (80-130 km) below the Central Andes reveal a fine-scale double-layered Wadati-Benioff zone (WBZ). Upper and lower band of seismicity are separated by about 9 km and occur at the top of the oceanic crust and in the uppermost oceanic mantle, respectively. Analysis of focal mechanisms and waveform similarities indicate that fluid processes are causing the events. Earthquakes in the oceanic crust occur on pre-existing normal faults due to hydraulic embrittlement from metamorphic dehydration, and on subvertical faults that connect the two layers in a narrow depth range. Extensional faulting predominates in both layers, indicating that slab pull forces are the dominant stress source superseding possible unbending forces in this segment of the Nazca plate.
Rietbrock Andreas
Waldhauser Felix
No associations
LandOfFree
A narrowly spaced double-seismic zone in the subducting Nazca plate 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 A narrowly spaced double-seismic zone in the subducting Nazca plate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A narrowly spaced double-seismic zone in the subducting Nazca plate will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1058708