Recent Progress of Seismic Observation Networks in Japan
By Y. Okada, Keiji Kasahara, S. Hori, K. Obara, S. Sekiguchi, H. Fujiwara, A. Yamamoto. 2004
839 citations recorded by the source corpus.
Before the occurrence of disastrous Kobe earthquake in 1995, the number of high sensitivity seismograph stations operated in Japan was nearly 550 and was concentrated in the Kanto and Tokai districts, central Japan. In the wake of the Kobe earthquake, Japanese government has newly established the Headquarters for Earthquake Research Promotion and started the reconstruction of seismic networks to evenly cover the whole Japan. The basic network is composed of three seismographs, i.e. high sensitivity seismograph (Hi-net), broadband seismograph (F-net), and strong motion seismograph (K-NET). A large majority of Hi-net stations are also equipped with a pair of strong motion sensors at the bottom of borehole and the ground surface (KiK-net). A plenty of high quality data obtained from these networks are circulated at once and is producing several new seismological findings as well as providing the basis for the Earthquake Early Warning system. In March 11, 2011, "Off the Pacific coast of Tohoku Earthquake" was generated with magnitude 9.0, which records the largest in the history of seismic observation in Japan. The greatest disaster on record was brought by huge tsunami with nearly 20 thousand killed or missing people. We are again noticed that seismic observation system is quite poor in the oceanic region compared to the richness of it in the inland region. In 2012, NIED has started the construction of ocean bottom seismic and tsunami observation network along the Japan Trench. It is planned to layout 154 stations with an average spacing of 30km, each of which is equipped with an accelerometer for seismic observation and a water pressure gauge for tsunami observation. We are expecting that more rapid and accurate warning of earthquake and tsunami becomes possible by this observing network.
Subfields: Artificial Intelligence, Geophysics
View Paper: https://www.semanticscholar.org/paper/6b17a2585df8aa9fb44f59c86b2f2ba40e300f5d
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Citations in the corpus
- Near‐surface weakening in Japan after the 2011 Tohoku‐Oki earthquake (2011, background): “KiK‐net [5] About 700 KiK‐net stations are distributed across Japan [Okada et al., 2004].”
- Regional Correlations of VS30 and Velocities Averaged Over Depths Less Than and Greater Than 30 Meters (2011, result): “This is consistent with the Okada et al. (2004) statement that K-NET and KiKnet stations are located on soil and rock sites, respectively.”
- Spatial distribution of scattering loss and intrinsic absorption of short‐period S waves in the lithosphere of Japan on the basis of the Multiple Lapse Time Window Analysis of Hi‐net data (2010, neutral): “Some reach depths of 3 km (Okada et al. 2004; Obara et al. 2005).”
- Seismicity rate immediately before and after main shock rupture from high-frequency waveforms in Japan (2007, methodology): “[7] In this study, we analyze waveforms of 82 earthquakes with 3 m 5 that are recorded by the High Sensitivity Seismograph Network (Hi-net) in Japan [Okada et al., 2004].”
- Source rupture processes of the foreshock and mainshock in the 2016 Kumamoto earthquake sequence estimated from the kinematic waveform inversion of strong motion data (2016, methodology): “We used strong ground motion data observed by K-NET, KiK-net, and F-net, which are nationwide observation networks operated by NIED (Okada et al.”
- A new approach to site classification: Mixed-effects Ground Motion Prediction Equation with spectral clustering of site amplification functions (2018, methodology): “In this study, we use the Kiban-Kyoshin network Okada et al. (2004) database compiled by Dawood et al. (2016) for ground motion studies.”