4 - 3 Network system of seismic observation
in Kyushu Island

Top of Part 4
Previous p.
Next page
Shimabara Earthquake and Volcano Observatory (SEVO) sets nine seismic observation sites within the Shimabara Peninsula to observe the seismic activity in detail of the volcano.
In addition, SEVO keeps a seismic observation network which includes another sixteen micro-earthquake observation sites to keep observation of seismicity in and around the Kyushu island.
Seismic data obtained at each sites are transmitted to SEVO in realtime by the satellite-relay telemetering system. Data so collected are automatically processed by the computer at SEVO.
Satellite-relay telemetering system makes it possible to receive data from observation sites operated by other universities. And through this system, we also exchanges data with Kagoshima, Tokyo, Kouchi and other Universities.
Furthermore, data gathered from university observation networks all over Japan are transmitted in realtime to the Japan Meteorological Agency and used for monitering seismic activity all over Japan and also in the world.

Seismograph (this side) and tiltmeter (far side) set up at the deep end of an observation tunnel. A parabolic antenna (2.4 meters across) for transmitting and receiving seismic data, placed at the housetop of SEVO.

Seismic data receiving and processing systems at SEVO.

View of a seismic observation site:
Various sensors are set up in an opposite end of the observation tunnnel which has a total length of 30 meters. Seismic data are transmitted from a parabolic antenna placed at the entrance of the tunnel.

Top Satellite-relay telemetering system

Satellite-relay telemetering system instantly transmits seismic data to a distant place through telecommunication satellites.
In comparison with the current ground circuit system, this new system makes a remarkable improvement in such points as higher reliability even during serious disasters such as big earthquakes, easier availablity even in secluded places among mountains or isolated remote islands, and very quicker start of temporary observation in anywhere in case of emergency.

Top page of Part 4 Previous page Next page