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
deep. and so when that shakes, it really shakes hard. a lot of subduction zone earthquakes are 200 miles deep. and there s a lot of padding between the shaking part and the earth surface where we live. here in chile, it is not that way. one great thing about where this tsunami happened, evenhough it was only about a six to eight-foot wave. this is not a highly populated area. you look at this cliff, these cliffs here almost of insanity, there is not a lot of place for people to live there. the people that do live here, live right along the coast, because they have to. it s the only flat land. and that s where we saw that last night. some of these areas here just north did see this water coming up and getting right into that community right through here. great graphics. really does help sort of explain the topography and how this played out. chad myers, thank you for that. and also our thanks to rolando santos, live for us in santiago, chile. we continue to update that story. a couple
then you go well above that. so maybe 7.5. okay. so a 9 would, as it was troublesome for japan would be troublesome for us? yes, except a 9 does not come from the type of faults around that reactor site. that is the other thing you have to consider. the very large earthquakes that japan saw are what are known as subduction zone earthquakes where one piece of ground goes under another. and the other flaults, slip faults like that, you simply don t get 9s in those. secretary stephen chu, appreciate your time. thank you. up next, we will go to cnn s arwa damon who just saw some of the effects of the air strikes near benghazi. firsthand. hoice. push your onstar button and you could be one of them. even if you re not an onstar customer. just push your blue button and tell the advisor