1. Tomoki Watanabe IFREE/DONET-MARITEC/JAMSTEC Marine Works Japan Co.
2017/4/19
Network Presentation
Tomoki Watanabe
IFREE/DONET-MARITEC/JAMSTEC
Marine Works Japan Co.
My first work with OBS,
taken in 1990
(Reykjanes Ridge experiment)
IRIS workshop 2007

2. JAMSTEC Network Presentation
2017/4/19
JAMSTEC Network Presentation
Tsuboi-san already presented.
We have ….
Broadband seismic network (Pacific 21)
Cabled Observatories
Muroto
Hatsushima
Kushiro-Tokachi
IRIS workshop 2007

3. Pacific 21 Network and DMC network design
2017/4/19
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
IRIS workshop 2007

4. Seiscomp Test…. Network geometry
2017/4/19
Seiscomp Test….
STS-1
+Q330HR
Q330HR
Network
geometry
Snapshot of the SeisComp monitor (seisgram)
Waveform of　the 2007 Sumatra earthquake
(Mw 8.2, sensor:STS-1)
IRIS workshop 2007

5. JAMSTEC Network Presentation
2017/4/19
JAMSTEC Network Presentation
Tsuboi-san already presented.
We have ….
Broadband seismic network (Pacific 21)
Cabled Observatories
Muroto
Hatsushima
Kushiro-Tokachi
IRIS workshop 2007

6. JAMSTEC Cabled Observatories
2017/4/19
JAMSTEC Cabled Observatories
Kushiro
Observatory
Hatsushima
Observatory
Muroto Observatory
IRIS workshop 2007

7. DONET --ocean bottom network coming near future--
2017/4/19
Development of Dense Oceanfloor Network System
for Earthquakes and Tsunamis (DONET)
Sensor spacing: ~20km
DONET --ocean bottom network coming near future--
IRIS workshop 2007

8. Network plan for DONET 5 nodes & 20 station Realtime monitoring
2017/4/19
Network plan for DONET
5 nodes & 20 station
Realtime monitoring
IRIS workshop 2007

9. Topics on Kushiro observation
2017/4/19
Topics on Kushiro observation
IRIS workshop 2007

10. Kushiro Cabled Observatory
2017/4/19
Kushiro Cabled Observatory
Observation: 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)
IRIS workshop 2007

11. Stations and structure used in hypocenter determination
2017/4/19
Stations and structure used in hypocenter determination
Velocity Structure
Network geometry of
Seismological Data exchange in Japan (connected by IP-VPN or Frame Relay)
Station Distribution
Data exchange in Japan
(with other institutes):
via Satellite & IP-VPN
– IPv6 multicast & IP-VPN
Cumulative number of processed earthquakes
IRIS workshop 2007

12. Kushiro Observatory - Earthquake Detectability -
2017/4/19
Kushiro Observatory - Earthquake Detectability -
Comparison of magnitudes
With JMA magnitude
Comparison of Detectabillity before/after OBS installation
Period: June-2002 Dec.
After installation, minimum magnitude detectable
Was improved to ~ M2.
M(JMA)=0.663M(ISV)+1.132
IRIS workshop 2007

13. Topics on Kushiro observatory
2017/4/19
Topics on Kushiro observatory
Seismicity – 2 gaps was recognized
off SE Hokkaido….
IRIS workshop 2007

14. 2003 Tokachi-oki earthquake(M8.0)
2017/4/19
Waveform of the Mainshock
At the nearest seismometer (OBS)
Aftershock distribution
IRIS workshop 2007

15. Data – available via… Pacific 21:(ninja, full SEED)
Ocean Bottom Cable Data Center:
(win format)
File format converter (win2db) :
Or SeisComp Package
(ver. 2.5, for online data)

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