2011/3/11 14:46, Depth 24km, M9.0 (JMA)
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1 Off the Pacific Coast of Tohoku earthquake, Strong Ground Motion /3/ 4:46, Depth 4km, M9. (JMA) Peak Ground Acceleration (surface) Peak Ground Velocity (surface) PGA [gal] PGV [cm/s] K NET 3 KiK net 35 Epicenter(JMA) 4 3 K NET 3 45 KiK net 35 Epicenter(JMA) The largest peak ground acceleration among K-NET and KiK-net sites was recorded at MYG4 K-NET station (waveforms displayed below), reaching 933 gals (3 components vector summation). MYG4 /3/ 4:46:36 Seismic Intensity : 6.67 JMA intensity 7 Acceleration [gal].7e+3 -.7e+3 Acceleration [gal].7e+3 -.7e+3 Acceleration [gal].88e+3 MYG kwin NS EW UD -.88e+3
2 Off the Pacific Coast of Tohoku earthquake, Strong Ground Motion Comparison of observed values of PGA and PGV with ground motion empirical attenuation laws (preliminary) Si & Midorikawa (999) inter-plate 3 PGA [cm/s/s] PGV [cm/s] Fault Distance [km] Peak Ground Acceleration(PGA) - 3 Fault Distance [km] Peak Ground Velocity(PGV) PGA and PGV were obtained as the maximum values between horizontal components. Observed PGV values were corrected to a Vs=6m/s, by removing the amplification at every station from boring information. The Mw8.9 is beyond the range of applicability of the empirical attenuation laws (Shi and Midorikawa,999) The fault model used is preliminary 36 km Assumed fault model
3 Tohoku Chihou Taiheiyou oki earthquake, Strong Ground Motion List of largest Observed Peak Ground Accelerations Station name PGA JMA intensity MYG4 933gal 6.6 MYG 9gal 6. 3 IBR3 845gal MYG3 88gal IBR3 76gal FKSH 335gal 6. 7 TCGH6 35gal TCG4 9gal IBRH 4gal 6. MYGH 37gal 6. JMA Instrumental intensity This list is based on information obtained by March 3, from 76 K-NET and KiK-net sites. 7 Evolution of intensity values in time Real time Intensity (Methodology by NIED) MTG4 MYG3 MYG MYG MYG MYG3 IBR3 IBR3 TCG4 IBR6 MYG4 (6.7) IBR3 (6.5) IBR3 (6.4) TCG4 (6.4) MYG3 (6.4) MYG (6.) IBR6 (5.9) Kunugi et al. (8) MYG (5.7) MYG (5.6) MYG3 (5.6) 4:47: 4:48: 4:49: 4:5: 4:5: 4:5: [4:46:6] [4:5:7] 3
4 Off the Pacific Coast of Tohoku earthquake, Strong Ground Motion Long Period Ground Motion recorded at K-NET, Chiba station (CHB9) CHB9 /3/ 4:47:9 3.7e+ -3.7e+.35e+ -.35e+.4e+ NS EW UD -.4e Velocity Response Spectra (5% damping) Velocity Response Spectra, h=.5 Velocity Response Spectra, h= Velocity Response Spectra (% damping) Velocity Response Spectra, h= Velocity Response Spectra, h=
5 Off the Pacific Coast of Tohoku earthquake, Strong Ground Motion Long Period Ground Motion recorded at K-NET, Shinjuku station (TKY7) TKY7 /3/ 4:47:9.44e+ -.44e+.3e+ -.3e+.e+ NS EW UD -.e Velocity Response Spectra (5% damping) Velocity Response Spectra, h=.5 Velocity Response Spectra, h= Velocity Response Spectra (% damping) Velocity Response Spectra, h=. Velocity Response Spectra, h=
6 Science and Disaster Prevention Characteristics of near-source ground motions IWTH8 /3/ 4:46:48 Seismic Intensity : N 4 IWTH8 The first phase is predominant -4 IWT9 /3/ 4:46:4 Seismic Intensity : N IWT9 IWT6-36 IWT6 /3/ 4:46:39 Seismic Intensity : IWT9 39 N MYG3-9 IWT9 /3/ 4:46:3 Seismic Intensity : MYG5 MYG7-5.7 Both phases are distinct 38 N MYG3 /3/ 4:46:3 Seismic Intensity : 5.55 FKS4 57 FKS N MYG5 /3/ 4:46:34 Seismic Intensity : IBR -4 IBR The second phase is predominant MYG7 /3/ 4:46:37 Seismic Intensity : N 37 CHB -37 FKS4 /3/ 4:46:38 Seismic Intensity : N E 4 E 4 E 4 E FKS3 /3/ 4:46:45 Seismic Intensity : In the northern part of the source area the first phase is predominant while in the South this phase is not visible. These two phases of ground motion suggest large slip areas in the North and South regions respectively. The remarkable differences in grow characteristics of intensity values for the Miyagi and Ibaraki regions indicate they originate from different slip areas. A small ground motion phase is observed between the two large distinct phase at some stations (FKS3, FKS4, MYG7, MYG5). Other secondary phases are also observed suggesting a very complex source process -96 IBR /3/ 4:47: Seismic Intensity : 5.6 The first phase is not visible Near-source acceleration waveforms display two remarkable phases of ground motion which suggest the existence of a least two areas of large slip IBR /3/ 4:47:6 Seismic Intensity : CHB /3/ 4:47:7 Seismic Intensity :
7 Source Process of the Off the Pacific Coast of Tohoku earthquake based on Strong Ground Motions (Preliminary) 4 ' 4 ' IWTH IWTH8 IWTH4 39 ' 38 ' 37 ' 36 ' 35 ' IWT8 IWTH IWT7 IWTH4 MYGH4 MYGH MYG MYG3 MYGH8 FKS4 FKSH9 FKSH9 FKS3 IBR IBR7 IBR CHB6 m ' 4 ' 4 ' 43 ' 44 ' 45 ' Distance along dip (km) Distance along strike (km) m m Depth (km)
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