NASA World Wind Seismograph Networks in Japan Introduction

NASA World Wind© Seismograph Networks in Japan ~ Introduction of NIED Data Management Center~ Katsuhiko Shiomi National Research Institute for Earth Science and Disaster Prevention, Japan May 9, 2007

Outline Ø Background of recent Japan dense seismograph array – Impact of 1995 Kobe Earthquake Ø Seismograph networks operated by NIED – High sensitivity seismograph network: Hi-net – Broadband seismograph network: F-net – Strong motion seismograph networks: K-NET / Ki. K-net Ø Data exchange and archive

Impact of 1995 Kobe Earthquake • Research for earthquake prediction (1960’s~) Hyogoken-Nanbu (Kobe) Earthquake (Mj 7. 3) attacked the metropolitan area of western Japan on January 17, 1995. More than 6, 000 people were killed, and about 250, 000 buildings were collapsed by this earthquake. ©NIED • Fundamental survey and observation for earthquake research (1997~)

Fundamental Seismic Survey and Observation for Earthquake Research Objective: Advancement in earthquake research to contribute to earthquake disaster mitigation. 1) Understanding earthquake phenomena and prediction of its occurrence. 1) 2) Understanding strong ground motion and its prediction.

Outline Ø Background of recent Japan dense seismograph array – Impact of 1995 Kobe Earthquake Ø Seismograph networks operated by NIED – High sensitivity seismograph network: Hi-net – Broadband seismograph network: F-net – Strong motion seismograph networks: K-NET / Ki. K-net Ø Data exchange and archive

Coverage of three kind seismographs Strong K-NET / Ki. K-net Strong motion seismograph F-net Broadband seismograph High-sensitivity seismograph Hi-net Weak Slow Fast

High Sensitivity Seismograph Network • Installed at the bottom of a borehole • Three components high-sensitivity velocity seismometer • Sampling frequency: 100 Hz • Continuous data recording • WIN 32 format • 773 stations (April, 2007) • Three components accelerograph X 2 • Installed both on ground surface and at the bottom of the Hi-net borehole • Event trigger recording NIED

Hi-net / Ki. K-net Data Collection Time Correction GPS WS Decimation 27 bit，100 Hz Velocity Seismometer Continuous Data Transmission IP-VPN Network AD Event Trigger Recording 24 bit, 200 Hz Hi-net Ki. K-net A/D Tsukuba DMC Strong Motion Seismometer (~2 G) Borehole Each Station

Coverage of three kind seismographs Strong K-NET / Ki. K-net Strong motion seismograph F-net Broadband seismograph High-sensitivity seismograph Hi-net Weak Slow Fast

Broadband Seismograph Network • Installed at the end of a tunnel of 30 to 50 m long • Three components broadband (STS-1 or 2) and strong-motion seismometers • Sampling frequency: 100 Hz • Continuous data recording • SAC, SEED, WIN 32 • 73 stations (April, 2007)

F-net Data Collection GPS F-net Tunnel A/D WS Continuous Data Transmission IP-VPN Network Decimation 27 bit，100 Hz Hi-net Tsukuba DMC Each Station JBoth F-net and Hi-net data are continuously collected, we use the same data collection system.

Outline Ø Background of recent Japan dense seismograph array – Impact of 1995 Kobe Earthquake Ø Seismograph networks operated by NIED – High sensitivity seismograph network: Hi-net – Broadband seismograph network: F-net – Strong motion seismograph networks: K-NET / Ki. K-net Ø Data exchange and archive

Real-Time Data Exchange in Japan JMA Data Service Public Service Internet Universities NIED Education / Research Local Government JAMSTEC AIST and others… Data Archive Research

Size of Continuous Data Example of Data of One Day Example of One Day. Size Data Composition 60 GB / day ü NIED data: 70% ü Hi-net data: 60% 22 TB / year All data (2002/06/03~) are saved on the storage system with 220 TB HDD and S-DLT Apr. 26, 2007

Request for User Registration

Request for User Registration We request all users to make registration to access the seismological data provided by NIED. See http: //www. hinet. bosai. go. jp/register/ENGLISH/ In order to evaluate the efficiency of our seismic observation data, ü Users should inform us about their results which they have obtained by using our data set. ü Second redistribution of our data is prohibited.

http: //www. bosai. go. jp/e/index. html

Ryukyu-Islands Distribution of NIED Seismograph Stations Tsukuba

Thank you very much for your attention!