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Network Presentation

Network Presentation. Tomoki Watanabe IFREE/DONET-MARITEC/JAMSTEC Marine Works Japan Co. My first work with OBS, taken in 1990 (Reykjanes Ridge experiment). JAMSTEC Network Presentation. Tsuboi-san already presented. We have …. Broadband seismic network (Pacific 21)

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Network Presentation

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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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