Physics – Geophysics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29t..38n&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 20, pp. 38-1, CiteID 1977, DOI 10.1029/2002GL015409
Physics
Geophysics
20
Marine Geology And Geophysics: Heat Flow (Benthic) And Hydrothermal Processes, Seismology: Earthquake Dynamics And Mechanics, Seismology: Oceanic Crust, Seismology: Seismicity And Seismotectonics
Scientific paper
At the subduction zone in northwestern Costa Rica, the seismogenic zone lies directly beneath the Nicoya Peninsula, allowing for near source seismic studies of earthquake activity. We located 650 earthquakes along the seismogenic plate interface using a dense seismic network in the vicinity of the Nicoya Peninsula. Using these data we constrained the updip limit of the seismogenic zone there and found a transition in depth, 10 km in the south to 20 km in the north, that occurs where the subducting oceanic crust changes from warmer Cocos-Nazca Spreading center (CNS) origin to colder East Pacific Rise (EPR) origin. We argue that the temperature of the incoming oceanic crust controls the seismogenic updip limit beneath Nicoya, Costa Rica; subducting colder oceanic crust deepens the seismogenic updip limit.
Deshon Heather R.
Dorman LeRoy M.
Gonzalez Valentino
Newman Andrew V.
Protti Marino J.
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