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National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan We analyzed strong-motion records at the ground and borehole in and around the Kanto Basin and the seafloor in the Japan Trench area from three nearby offshore earthquakes of similar magnitudes (Mw 5.8–5.9). The seafloor strong-motion records were obtained from S-net, which was established to enhance tsunami and earthquake early warnings after the 2011 great Tohoku-oki earthquake disaster. The borehole records were obtained from MeSO-net, a dense network of seismometers installed at a depth of 20 m in the Tokyo metropolitan area. The ground records were obtained from the K-NET and KiK-net networks, established after the 1995 great Hanshin-Awaji earthquake disaster. The MeSO-net and S-net stations record the shakings continuously, while the K-NET and KiK-net records are based on triggering thresholds. It is crucial to evaluate the properties of strong motions recorded by the S-net for earthquake

United statesJapan trenchJapan generalNew zealandPingdong xianBaden wübergR hansen cambridgeHeadquarters for earthquake research promotionObservation network for earthquakeSeinnic design for nuclear power plantsProgress of seismic observation networksJapan meteorological agencySeafloor observation networkNational research institute for earth scienceDistribution of the metropolitan seismic observation networkNational seismic