[S-TT57_30PO1] Seismometry and monitoring system

[STT57-P09] Construction of the seismic observation network around Shimokita Peninsula

*Shutaro SEKINE¹, Yoshihiro SAWADA¹, Keiji KASAHARA¹, Shunji SASAKI¹, Yoshihiro TAZAWA¹, Hiroshi YAJIMA¹ (1.Association for the Development of Earthquake Prediction)

Keywords:seismic observation network, Shimokita Peninsula

IntroductionSeismic activity in the Shimokita region is not well grasped, because the distribution of the seismic stations is not dense compared with that of Southern Tohoku region. So, it is not enough to estimate the depth of the seismogenic zone. Accordingly, the Association for the Development of Earthquake Prediction (ADEP), determined to newly construct a high-density seismic observation network (AS-net) in the region in question, as a part of its investigation and research into seismic activity in the Shimokita Peninsula. An outline of the observation network is presented below.Outline of the network The AS-net consist 36 seismic observation stations. 20 stations were made before the end of 2013. And the other stations will make in 2014.The sensors of each station are installed in boreholes at a depth of about 20m. We set the short period three dimensional velocity sensors by Lennartz, and accelerometers by Japan Aviation Electronics Industry ltd. And A/D converter is LS-7000XT made by Hakusan Co. The data of the each station send to ADEP using with Internet, and relay to other facility for research. Future worksIt is anticipated that useful data will be obtained regarding detailed velocity and attenuation structures in the area surrounding the seismic observation network, as well as micro earthquake activity in the regions. The number of the earthquakes we estimate in January, is twice as that of JMA.