Antelope as a Platform for Data Exchange Nozomu Takeuchi (University of Tokyo)

Brief introduction for seismic observations conducted by Japanese institutes. Outline Introduction of our project on data exchange - Which kinds of data are available? Who are we?

High Sensitivity SensorsBroadband Sensors Domestic Station Distributions in Japan Colors denote the institutes managing that station.

Domestic Seismic Observation System before Kobe Earthquake The Ministry of Education Universities Networks for research The Prime Minister’s Office Networks for disaster management NIED The Ministry of Transport JMA Networks for monitoring (National Research Institute for Earth Science and Disaster Prevention) (Japanese Meteoro- logical Agency)

after Kobe Earthquake Headquarters of Earthquake Res. Promotion Universities NIEDJMAOther institutions data exchange Domestic Seismic Observation System

Data Exchange Among Institutions (Unfortunately, we are not using Antelope here.)

waveform display, picking the arrival times, hypocenter determinations, and others GUI for

Grid MT real time determination of moment tensors

automatic tremor monitoring system ATMOS (in Japanese)

Availability of Domestic Data (slightly oversimplified) High Sensitivity Sensors Broadband Sensors Strong Motion Sensors UniversitiesJ-Array SK-net etc. 147 JMA 584 NIEDHi-net 790 F-net 73 K-net 1735 Kik-net 691 Others J-Array Hi-net (Japanese) F-net K-net Kik-net (*) * available upon requests fundamental earthquake observation networks

Fundamental Earthquake Observation Networks The necessities are defined by governmental policies. Funding is relatively guaranteed. homogeneous station distribution. homogeneous instrumentations.

high data quality. Well maintained. Fundamental Earthquake Observation Networks All data should be open to public. Hi-net, Kik-netF-net borehole observations vault with m depth VBB sensors

International Networks by Japanese Institutions OHP SPANET Special Coordination Funds for the promotion of Sci. and Tech. Grand-in-aid for Scientific Research Constructed by competitive funds. Aiming at the Pacific regions.

PSI station (OHP)NRFK station (SPANET) Network Maintainance OHP by IFREE/JAMSTEC and ERI/U. Tokyo SPANET by NEID The Management expense grants are used for operations. Some stations have a vault but some do not. VBB sensors for some stations but BB sensors for another stations.

Available International Data All continuous data are open to the public. All data are provided in SEED format. OHP SPANET

Stations of Global Networks currently available stations ● IRIS GSN, GEOSCOPE ● OHP

Stations of Global Networks and Various National Networks ● IRIS GSN, GEOSCOPE ● OHP, F-net, NECESSArray ● national network Wang and Niu (2010) currently available stations open to the public via the IRIS DMC

Improvements in the Resolution by Using Azimuthal Dependency ScS reflection points for SE-NW paths

ScS reflection points for N-S paths Improvements in the Resolution by Using Azimuthal Dependency

Improvements in the Resolution by Using Azimuthal Dependency ScS-S residuals for N-S paths

Improvements in the Resolution by Using Azimuthal Dependency ScS-S residuals for N-S paths

OHP Data Collection System

OHP Data Exchange System

(future plan)