XY (2002-2002): US-Japan Collaborative Research: Multi-Scale Seismic Imaging of the Mariana Subduction Factory
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FDSN Network Information
| FDSN code | XY (2002-2002) | Network name | US-Japan Collaborative Research: Multi-Scale Seismic Imaging of the Mariana Subduction Factory (Mariana) |
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| Start year | 2002 | Operated by |
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| End year | 2002 | Deployment region | - |
| Description |
Seismic refraction imaging of the forearc and active arc of the Mariana island-arc system, at 14° to 19°N. The principal objective is to determine the velocity and density structure of the crust as a proxy for the composition of an intra-oceanic arc, with implications for models of continental growth and crustal recycling to the mantle, and if possible to image magma chambers below active volcanoes. We deployed 53 OBSIP OBSs from Scripps (with 2 Hz vertical sensors and hydrophones) in three arc-parallel lines, along the volcanic arc, along the uplifted fore-arc high, and along the modern forearc midway between the trench and the volcanic arc. We used the 20-airgun array (10,810 c.i. towed at 10.5 m to maximize source energy at low frequencies) of R/V Ewing as our controlled source, firing the array every 200 m (250 m in the deeper water), or about every 90 to 100 secs at c. 4.5 kts. We simultaneously recorded our airgun shots on the standard Ewing MCS 6-km streamer, recording 240 (50-m) channels every 8 ms with a 61.44 sec record length, for a nominal sub-surface penetration of c. 200 km. We recorded 3035 km of nominal 15-fold (and 12-fold) data, shooting along the three OBS deployment lines, along an additional arc-parallel line west of the active arc, and along 6 arc- crossing lines. |
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