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Explore the development of the Pacific 21 Broadband Seismic Network and Cabled Observatories in Japan, including the deployment of DONET for earthquake and tsunami monitoring. Detailed information on station distribution, data exchange protocols, and seismic observation enhancements.

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  1. Network Presentation Tomoki Watanabe IFREE/DONET-MARITEC/JAMSTEC Marine Works Japan Co. My first work with OBS, taken in 1990 (Reykjanes Ridge experiment)

  2. JAMSTEC Network Presentation • Tsuboi-san already presented. • We have …. • Broadband seismic network (Pacific 21) • Cabled Observatories Muroto Hatsushima Kushiro-Tokachi

  3. Pacific 21 Network and DMC network design STS-2: HBR, MCSJ STS-1: KMS, TSK, INU, TJN, OGS, BAG, PALU, JAY, PSI, PMG CMG-3T: KSI

  4. Seiscomp Test…. STS-1 +Q330HR Q330HR Network geometry Snapshot of the SeisComp monitor (seisgram) Waveform ofthe 2007 Sumatra earthquake (Mw 8.2, sensor:STS-1)

  5. JAMSTEC Network Presentation • Tsuboi-san already presented. • We have …. • Broadband seismic network (Pacific 21) • Cabled Observatories Muroto Hatsushima Kushiro-Tokachi

  6. JAMSTEC Cabled Observatories Kushiro Observatory Hatsushima Observatory Muroto Observatory

  7. DONET--ocean bottom network coming near future-- Development of Dense Oceanfloor Network System for Earthquakes and Tsunamis (DONET) Sensor spacing: ~20km

  8. Network plan for DONET • 5 nodes & 20 station • Realtime monitoring

  9. Topics on Kushiro observation

  10. Kushiro Cabled Observatory Observation: 1999. July - • - Cable Length: c.a. 240km • 3 Seismometers (accelerometer) • Japan Aviation Electronics Industory(JAE)JAE5-III • - 2 Tsunami gauges • 1 cable-end station (ADCP, CTD, • camera,Hydrophone, • sub-sea thermometer)

  11. Stations and structure used in hypocenter determination Data exchange in Japan (with other institutes): -2006.12.19 via Satellite & IP-VPN 2006.12.19 – IPv6 multicast & IP-VPN Velocity Structure Network geometry of Seismological Data exchange in Japan (connected by IP-VPN or Frame Relay) Station Distribution Cumulative number of processed earthquakes

  12. Kushiro Observatory - Earthquake Detectability - Comparison of Detectabillity before/after OBS installation Comparison of magnitudes With JMA magnitude Period: 2001. June-2002 Dec. After installation, minimum magnitude detectable Was improved to ~ M2. M(JMA)=0.663M(ISV)+1.132

  13. Topics on Kushiro observatory Seismicity – 2 gaps was recognized off SE Hokkaido….

  14. 2003 Tokachi-oki earthquake(M8.0) Waveform of the Mainshock At the nearest seismometer (OBS) Aftershock distribution

  15. Data – available via… • Pacific 21:(ninja, full SEED) http://www.jamstec.go.jp/pacific21/ • Ocean Bottom Cable Data Center: (win format) http://www.jamstec.go.jp/scdc/ File format converter (win2db) : http://www.iris.edu/manuals/#11 Or SeisComp Package (ver. 2.5, for online data)

  16. And one more contenton the seafloor when an earthquake occurs…

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