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| Lau Basin Visualization Downloads |
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- Lau Basin Spreading Center (focus on shallow features)
This movie of the Lau Basin highlights the area around the integrated study site (ISS) along the Eastern Lau Spreading Center. Features include along-axis multichannel seismic (MCS) data that shows a relatively continuous reflection from the interface (green line) between the pillow basalts and sheeted dikes, while the axial magma chamber reflection does not appear until further south (red lines). We also include active volcanoes (orange cylinders), hydrothermal vent fields (red diamonds), and bathymetry (colored by elevation, vertical exaggeration 6X, spanning longitudes 180-188 and latitudes -23 to -14). This movie was used by Doug Wiens in his presentations for the Ridge 2000 Distinguished Lecturer Series.
- Lau Basin Spreading Center (focus on deeper features)
Movie of the spatial relationship of different data types near the integrated study site (ISS) along the Eastern Lau Spreading Center. For reference we include a mesh that represents the center of the subduction zone earthquakes, which extends to a depth of ~700 km. Other data include active volcanoes (orange cylinders), bathymetry (colored by elevation, vertical exaggeration 6X, spanning longitudes 180-188 and lattitueds -23 to -14), and historic earthquake data (pink spheres). The relatively shallow vertical cross-sections are long-axis multichannel seismic (MCS) data and the large scale red/blue/green/yellow verticle cross-sections are tomographic images, where the blue colors represent fast seismic velocities (likely cold mantle) and the orange/red colors represent slow velocities (likely warm mantle or melt regions).. This movie was used by Doug Wiens in his presentations for the Ridge 2000 Distinguished Lecturer Series.
- 8.0 Mw Earthquake in Tonga
This scene file visualizes the 8.0 Mw earthquake that occurred 95 miles off the coast of the Pacific island nation of Tonga on 3 May 2006 at ~8:26 am PDT. The shallow earthquake (~16 km) generated an initial tsunami warning for Fiji and New Zealand, but was subsequently canceled. (D. Kilb)
- Closer view of 8.0 Mw Earthquake in Tonga
This scene file shows the location of the 8.0 Mw earthquake that struck on 3 May 2006 near Tonga. The hypocenter of the earthquake is indicated by a red diamond and is surrounded by past seismicity (represented as cubes) in the region. [References] (D. Kilb, A. Jacobs)
- Grand
Lau Basin integrated scene (and Movie)
[Updated November 2007]
Our latest integrated scene. Combines old and new regional bathymetry (Taylor and Martinez, 1996; Martinez et al., 2006), seismic sections with indicators of where the axial magma chamber may be pure melt (Jacobs et al., in revision 2007), geochemical data (Langmuir, pers. comm.), hydrothermal venting information (Baker et al., 2006), and earthquakes from the subducting slab (Engdahl catalogue). [References] (A. Jacobs)
- Central Lau Spreading Center scene
Scene combines bathymetry (1996 version), multichannel seismic sections (both along- and across-axis), and TiO2 concentrations (colored by concentration, from Langmuir). TiO2 is used as a diagnostic of whether the crustal rocks along the Lau basin spreading centeres are geochemically similiar to a mid-ocean ridge basalt (MORB) or if they contain geochemical influences fromt he slab subduction at the Tonga Trench. Also, the west side of the scene shows white cubes representing locations of nearby IODP drill sites. [References] (A. Jacobs)
- Eastern Lau Spreading Center scene
Scene combines bathymetry (1996 version), multichannel seismic sections (both along- and across-axis), and SiO2 concentrations (colored by concentration, from Langmuir). SiO2 is used as a diagnostic of whether the crustal rocks along the Lau basin spreading centeres are geochemically similiar to a mid-ocean ridge basalt (MORB) or if they contain geochemical influences fromt he slab subduction at the Tonga Trench. Also, the west side of the scene shows red cubes representing locations of nearby IODP drill sites. [References] (A. Jacobs)
- Valu Fa Ridge scene
Scene combines bathymetry (1996 version), multichannel seismic sections (both along- and across-axis), and SiO2 concentrations (colored by concentration, from Langmuir). SiO2 is used as a diagnostic of whether the crustal rocks along the Lau basin spreading centeres are geochemically similiar to a mid-ocean ridge basalt (MORB) or if they contain geochemical influences fromt he slab subduction at the Tonga Trench. [References] (A. Jacobs)
- Lau Basin/Tonga Trench Regional scene
Scene combines bathymetry (1996 version), axial lines of the CLSC and ELSC/VFR (white), the Tonga Trench axis (green line), earthquakes (colored by magnitude, Engdahl catalogue), and tomographic slices of the region (from Wiens, pers. comm. and Zhao et al., 1997). [References] (A. Jacobs)
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