NDLI: Seismic structure of the endeavour segment, juan de.

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Seismic structure of the endeavour segment, juan de.

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Abstract	Segment, Juan de Fuca Ridge, show a midcrustal reflector underlying all of the known high-temperature hydrothermal vent fields in this area. On the basis of the character and geometry of this reflection, its similarity to events at other spreading centers, and its polarity, we identify this as a reflection from one or more crustal magma bodies rather than from a hydrothermal cracking front interface. The Endeavour magma chamber reflector is found under the central, topographically shallow section of the segment at two-way traveltime (TWTT) values of 0.9–1.4 s (2.1–3.3 km) below the seafloor. It extends approximately 24 km along axis and is shallowest beneath the center of the segment and deepens toward the segment ends. On cross-axis lines the axial magma chamber (AMC) reflector is only 0.4–1.2 km wide and appears to dip 8–36 to the east. While a magma chamber underlies all known Endeavour high-temperature hydrothermal vent fields, AMC depth is not a dominant factor in determining vent fluid properties. The stacked and migrated seismic lines also show a strong layer 2a event at TWTT values of 0.30 ± 0.09 s (380 ± 120 m) below the seafloor on the along-axis line and 0.38 ± 0.09 s (500 ± 110 m) on the cross-axis lines. A weak Moho reflection is observed in a few
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Subject Keyword	Endeavour Segment Seismic Structure Cross-axis Line Amc Depth Axial Magma Chamber Magma Chamber Underlies Twtt Value Along-axis Line Two-way Traveltime High-temperature Hydrothermal Vent Field Shallow Section Hydrothermal Cracking Front Interface Crustal Magma Body Weak Moho Reflection Strong Layer Migrated Seismic Line Midcrustal Reflector Endeavour Magma Chamber Reflector Dominant Factor Vent Fluid Property Endeavour High-temperature Hydrothermal Vent Field
Content Type	Text

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