Antelope as a Platform for Data Exchange

Nozomu Takeuchi

(University of Tokyo)

Brief introduction for seismic observationsconducted by Japanese institutes.

Outline

Introduction of our project on data exchange

- Which kinds of data are available?

1.

2.

- Who are we?

High Sensitivity Sensors Broadband Sensors

Domestic Station Distributions in Japan

Colors denote the institutes managing that station.

Domestic Seismic Observation Systembefore Kobe Earthquake

The Ministry ofEducation

Universities

Networksfor research

The PrimeMinister’s Office

Networks for disaster management

NIED

The Ministry ofTransport

JMA

Networks formonitoring

(National Research Institute for Earth Science and Disaster Prevention)

(Japanese Meteoro- logical Agency)

after Kobe Earthquake

Headquarters of Earthquake Res. Promotion

Universities NIED JMA Other 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

http://wwwic.eri.u-tokyo.ac.jp/GRID_MT

automatic tremor monitoring system

ATMOS

http://tremor.geol.sci.hiroshima-u.ac.jp/ (in Japanese)

Availability of Domestic Data (slightly oversimplified)

High SensitivitySensors

BroadbandSensors

Strong MotionSensors

Universities J-Array 237 50

208 20

SK-net etc. 147

JMA 584

NIED Hi-net 790

F-net 73

K-net 1735

Kik-net 691

Others 33 2 1369

J-Array http://jarray.eri.u-tokyo.ac.jpHi-net http://www.hinet.bosai.go.jp (Japanese)F-net http://www.fnet.go.jpK-net http://www.k-net.bosai.go.jpKik-net http://www.kik.bosai.go.jp

(*)

* available upon requests

fundamental earthquakeobservation 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-net F-net

borehole observationsvault with 30-50 m depthVBB sensors

International Networks by Japanese Institutions

OHP

SPANETSpecial Coordination Funds for the promotionof Sci. and Tech.

Grand-in-aid for Scientific Research1996-2001

1996-2000

• Constructed by competitive funds.

• Aiming at the Pacific regions.

PSI station (OHP) NRFK station (SPANET)

Network MaintainanceOHP by IFREE/JAMSTEC and ERI/U. TokyoSPANET 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 http://ohpdmc.eri.u-tokyo.ac.jpSPANET http://www.isn.bosai.go.jp

Stations of GlobalNetworks

• currently available stations

● 　 IRIS GSN, GEOSCOPE● OHP

Stations of GlobalNetworks and VariousNational 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

OHP Data Exchange System (future plan)