Metropolitan area seismometry network

A middle sensitivity seismometry network with the underground seismometer of the borehole type which the metropolitan area seismometry network (しゅとけんじしんかんそくもう, English: Metropolitan Seismic Observation network, abbreviated to MeSO-net メソネット) wanted to be begun (19, Heisei) from the year in 2007 by Ministry of Education, Culture, Sports, Science and Technology, and was maintained by "capital earthquake directly above the focus disaster prevention, 減災特別 project" [¹]. In the observation point, it is established approximately 400 places [²] (as of 2009) around Kanto plains of South Kanto.

I could decide high seismic center distribution of the precision than a conventional observation network by having built a high-density observation network, and the basement structure (earthquake wave speed structure) that was more necessary for a vibration (the strong vibration) prediction to destroy a building became clear [³].

Table of contents

Characteristic

An observation well of the 3,000m grade to arrive at it is expected to a base under the sedimentation layer on the Kanto plains to obtain the observation data of the high quality, but a seismometer is installed in the basement of around 20m to maintain an observation network in the term of works when it is cheap and has a short it, and the above ground part device can operate even a blackout for approximately 50 hours. As for the location of the observation point, public educational institution, park, public library are chosen a lot mainly.

Because an observation well is shallow, the drop of the S/N ratio of the observation data by the noise [⁴] with a life noise (vibration with human economic activities) and the weather phenomenon was concerned about, but the data which make full use of various technique, and reduced a noise are provided. In addition, it is necessary to consider it so that technical tradition is not cut off by progress of time because the technique to build the borehole observation facilities is a technical body of the private master, but leaves a method of construction to realize structure, the model of the apparatus as a document record.

The observation point is higher-density than a high sensitive seismometry network of Meteorological Agency and Natl. Res. Inst. for Earth Sci. and Disaster Prevention (Hi-net), and it is located to give the resolution of observation data. In addition, 免震機能 and the datacenter with the home generation of electricity device are put in Earthquake Res. Inst., Univ. of Tokyo [⁵], and the observation data are delivered to the organization concerned.

Data communications

I take advantage of the highly precise time using GPS, and data are given a precise thyme stamp every observation point [⁶]. The data communications of MeSO-net use an Internet line, but data omission might produce it at the time of reception side overload by the transmission method of the conventional WIN system in the rush hours of the line, but an autonomy cooperation type data communications protocol (Autonomous Cooperative data Transer Protocol:ACT Protocol) is developed by our system newly, and process "retransmissions by data when there is not a reply that was transmitted normalcy" "to reduce transmission quantity when data communications remained"; from an operational start in October, 2009 in until the point the omission of data communications straight じなていない [⁶]. In addition, the source code of this ACT Protocol is shown as an open source [⁶].

Source

• A development earthquake research institute bulletin of metropolitan area seismometry network (MeSO-net). Four 84th, 2009, pp. 331-344

Footnote

1. ^ About the last result report of capital earthquake directly above the focus disaster prevention, the 減災特別 project Ministry of Education, Culture, Sports, Science and Technology
2. ^ Planned observation point and existing tele meter observation point of 400 places of MeSO-net
3. Institute for three-dimensional earthquake wave speed tectonic earthquake bulletin right under the capital obtained from the ^ routine observation network. Four 84th, 2009, pp. 331-344
4. ^ Various noises to be seen in a metropolitan area seismometry network (MeSO-net) An earthquake research institute bulletin. Two 84th, 2009, pp. 127-139
5. Construction of the ^ metropolitan area seismometry network datacenter and an operational earthquake research institute bulletin. Two 84th, 2009, pp. 107-114
6. ^ ^{a b c} About the data communications method of the metropolitan area seismometry network (MeSO-net): The development earthquake research institute bulletin of the autonomy cooperation type data transmission procedure (ACT protocol). Two 84th, 2009, pp. 89-105

Allied item

• South Kanto earthquake directly above the focus
• Severe earthquake observation network
• Kanto earthquake
• Philippine Sea plate
• Hot spring earth science research institute

Outside link

• Capital earthquake directly above the focus disaster prevention, 減災特別 project
• Project Earthquake Res. Inst., Univ. of Tokyo right under capital
  • Report
• Various noises to be seen in metropolitan area seismometry network (MeSO-net)
• Earthquake of Northeast Chiba by MeSO-net Headquarters for Promotion of earthquake research

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