The OHANA OBS deployment in the Northeast Pacific Ocean
| Autor: | Laske, G., Collins, J., Blackman, D. |
|---|---|
| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-0780 |
| Popis: | In early 2023, 25 broadband ocean bottom seismometers (OBSs) were recovered in the northeast Pacific Ocean, about halfway between Hawaii and the North American west coast. These instruments had collected seismic data continuously for nearly 15 months.The OHANA project is an integrative seismic study to explore the crust, lithosphere and asthenosphere in a 600~km wide region west of the Moonless Mountains. The new data will enhance seismic imaging in a regional as well as in a global context: regionally, the analysis of surface waves and receiver functions as well as surface wave azimuthal anisotropy and shear-wave splitting will provide insight into the seismic structure within the OBS network and mantle deformation fabric of 40-to-50 Myr old Pacific lithosphere. A fundamental question to be addressed is whether this particular area has the signature of a normal plate cooling history or if there is evidence for a previously proposed reheating process, e.g. resulting from small-scale shallow-mantle convection. Within a global framework, the new surface wave data will profoundly improve current global dispersion maps, allowing researchers to reduce imaging biases caused by trade-offs between lateral isotropic heterogeneity and azimuthal anisotropy that result from uneven data coverage, in the study area as well as far outside of it. The ONAHA network occupied one of the the long-envisioned locations of the Pacific Array and thereby contributes to this larger international community initiative. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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