PACIFIC21_*
2002 FDSN Report

by Seiji Tsuboi
Institute for Frontier Research on Earth Evolution(IFREE)
Japan Marine Science and Technology Center (JAMSTEC), Yokosuka 237-0061 Japan
email: tsuboi@jamstec.go.jp

 

PACIFIC21 has integrated the broadband seismograms from three projects which had started in April 1996: (1) Fundamental Research on Earthquake and Earth'S Interior Anomaly (FREESIA), (2) Plume project, and (3) Umi-Hankyu (OceanHemisphere) Network. Under the FREESIA, they installed about 50 STS-1  or CMG-1 broadband seismometers in Japanese Islands. 3 component continuos data are archived at National Institute of Earth Science and Disaster Prevention in realtime. Under the Plume project they have collaborated with IRIS to establish broadband seismograph stations in Southern Pacific Ocean. This network is called SPANET. They also had mobile seismic array system with more than 20 broadband seismometers and operated this array in Indonesia. Umi-Hankyu is the successor of the project POSEIDON. Under Umi-Hankyu project, they have installed long term ocean bottom seismometer in ODP drill holes and ocean floor. Umi-Hankyu project maintains broadband seismograph stations that have been installed during project POSEIDON and upgraded data logging systems and seismometers.

   Since both the plume project and the Umi-Hankkyu project had been terminated in 2001, it has been decided that terrestrial broadband seismic stations and marine geophysical network, which were constructed under Umi-Hankyu project will be maintained by new project called, Institute for Frontier Research on Earth Evolution(IFREE), which has started in April of 2001. The SPANET broadband seismic stations will be maintained by NIED.Within first five years of IFREE, the new network data center will be operated under IFREE. That data center will manage PACIFIC21 dataset and other geophysical dataset from marine geophysical network. This newtwork data center will be operated based on the network based datacenter system "ninja", developped by Earthquake Research Institute of the University of Tokyo. For the time being, seismograms of PACIFIC21 dataset can be retrieved at each data center, such as

(1) http://ohpdmc.eri.u-tokyo.ac.jp.

(2) http://www.plume.bosai.go.jp