[SIT27-01] Pacific Array update 2020
Keywords:OBS, oceanic lithosphere, asthenosphere
Between 2018-2019, this initiative moves forward with three new arrays. The first 30-station seismic array (young-ORCA) was deployed April 2018 – May 2019 on 40-Ma seafloor northeast of the Marquesas Islands by the US team, which was followed by another one (old-ORCA) for Nov 2019 – Dec 2020 on 110-Ma seafloor southwest of Tahiti. Data from both arrays will be openly available upon recovery. The second 12-seismic and 8-EM array was deployed in Oct-Nov, 2018 – Nov, 2019 as a collaboration between Japan and South Korea on the oldest seafloor in the western Pacific (Oldest1). Also two new arrays (at around the Galapagos Islands and the old H2O seafloor observatory) have been funded by NSF. Further a second array on the oldest seafloor (Oldest2) at east of Oldest1 has been proposed as a collaboration between Japan and Taiwan. These new arrays are planned to be deployed in early 2021. We summarize these experiments possibly with early results, and describe goals, news and plans for expanding Pacific Array through broader participation of the international seismology and geodynamics community. Updated information can be found at http://eri-ndc.eri.u-tokyo.ac.jp/PacificArray/ .