Current status of realtime seismic network in and around Japanese

IslandsJapan Agnecy for Marine-Earth

Science and TechnologySeiji Tsuboi

Seismological stations in Japan

After 1995 Kobe earthquake, 　 installation of stations has been accelerated.

　 　 As of 2011;・ 1235 short period 3 component seismometer・ 125 broadband 3 component seismometer・ 3721 strong motion seismometer・ 1466 GPS stationsMost of these are connected in realtime

Realtime data transmission through IP-VPN

100Hz sampling rate digital seismograms from more than 800 seismic stations are transmitted in realtime

Win format is usedDuality of transmission is secured (UDP and IP)Delay time should be less than 1 second and

quality should be 99%.Data are used to locate earthquake hypocenter

and issue earthquake early warnings

Earthquake Early Warning by JMA

20 ocean bottom observatories will be installed in future To-Nankai earthquake rupture area.Type of instruments:■Strong Motion Seismometer ：　 Metrozet TSA-100S ■Broadband seismometer ：　 Guralp CMG-3TRH ■Hydrophone ：　 High Tech HTI-99-DY■Differential Pressure Gauge ：　 Nichiyu Giken Kogyo MA-567000 ■Quartz Crystal Pressure Gauge ：　 Paro Scientific 8B7000-2-005 ■Precision Thermometer ：　 Nichiyu Giken Kogyo MA-565-2 series

Peak Performance/CPU

102.4Gflops Total number of CPU

1280

Peak Performance/PN

819.2Gflops Total number of PN

160

Shared memory/PN

128Gbytes Total peak performance

131Tflops

CPUs/PN 8 Total main memory

20Tbytes

Earth Simultor 2

The new Earth Simulator system, which began operation in March 2009, achieved sustained performance of 122.4 TFLOPS and computing efficiency of 93.38% on the LINPACK Benchmark

Next　Generation　Supercomputer　Project

• The　system　will　use　scalar　CPUs　(SPARC64™　VIIIfx,　8　cores,　128　gigaflops)　manufactured　with　45nm　process　technology.

• The　network　between　the　computing　nodes　will　consist　of　a　direct-connection　network.

• With　its　water　cooling　system,　the　supercomputer　will　maintain　a　low　temperature　in　the　CPU　and　other　LSIs,　minimizing　the　failure　rate　and　reducing　power　consumption.

• Max.　performance　10　Petaflops• Completion　planned　for　2012

Next　Generation　Supercomputer　Project

High precision simulation of earthquake and tsunamis

Simulation of strong ground motion

Simulation of tsunamis

Simuation of seismic hazard in the cities