Paper:

# Radiation and Generation of Short- and Long-Period Ground Motions from the 2011 Off Tohoku, Japan, *M*_{w}9.0 Earthquake

_{w}

## Takashi Furumura^{*,**}

^{*}Center for Integrated Disaster Information Research, Interfaculty Initiative in Information Studies, The University of Tokyo

^{**}Research Center for Large Scale Earthquake, Tsunami and Disaster, Earthquake Research Institute, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan

Ground motion from the *M _{w}*9.0 March 11, 2011, Off-Tohoku earthquake recorded by dense seismic networks in Japan, K-NET and KiK-net, clearly demonstrated the high-frequency seismic wavefield radiating from the earthquake source and developing longperiod ground motion in sedimentary basins. The photographic sequence of the visualized wavefield demonstrated the process in which the high-frequency seismic waves radiated from large slips at the top of the subducting Pacific Plate at relatively deeper depth of 25-50 km, which caused multiple large shocks of large (>1000-2000 cm/s

^{2}) ground acceleration and several minutes lasting ground motions over a wide area along the Pacific Ocean side of northern Japan. An efficient seismic wave propagation along the subducting Pacific slab and ground motion amplification in a superficial thin low-velocity layer overlying rigid bedrock also enhanced high-frequency (>5 Hz) ground motions very drastically. However, the dominant frequency of the strong ground motion recorded in nearfield station was too high such as to cause serious damage to wooden-frame residences having relatively longer-period resonance period (

*T*= 1-2 s); The velocity response in this frequency band was only about one third to one half of those observed in severely damaged area during the destructive

*M*6.9 1995 Kobe earthquake. The 2011 Off-Tohoku earthquake also produced long-period ground motion in sedimentary basins such those at Tokyo’s population center but observation of the long-period ground motion within

_{w}*T*=6-8 s was rather weak and of a level comparable to that of an

*M*7.9 Tonankai earthquake occurring along the Nankai Trough in 1944. This was because the surface wave in this period band was not generated efficiently by the relatively deeper slip over the source fault of the Off-Tohoku earthquake.

*M*9.0 Earthquake,”

_{w}*J. Disaster Res.*, Vol.9, No.3, pp. 281-293, 2014.

- [1] S. Kinoshita, “Kyoshin Net (K-NET),” Seism. Res. Lett., Vol.69, pp. 309-332, 1998.
- [2] S. Aoi, T. Kunugi, H. Nakamura, and H. Fujiwara “Deployment of new strong-motion seismographs of K-NET and KiK-net,” in Earthquake Data in Engineering Seismology, pp. 167-186, Springer, 2011.
- [3] T. Furumura, S. Takemura, S. Noguchi, T. Takemoto, T. Maeda, K. Iwai, and S. Padhy, “Strong ground motions from the 2011 offthe Pacific-coast-of-Tohoku, Japan (
*M*= 9.0) earthquake obtained from a dense nation-wide seismic network,” Landslides, Vol.8, pp. 333-338, 2011._{w} - [4] I. Takewaki, S. Murakami, K. Fujita, S. Yoshitomi, and M. Tsuji, “The 2011 off the Pacific coast of Tohoku earthquake and response of high-rise buildings under long-period ground motions,” Soil Dynamics and Earthquake Engineering, Vol.31, No.11, pp. 1511-1528, 2011.
- [5] T. Furumura, B. L. N. Kennett, and K. Koketsu, “Visualization of 3D wave propagation from the 2000 Tottori-ken Seibu, Japan, earthquake: observation and numerical simulation,” Bull. Seism. Soc. Am., Vol.93, pp. 870-881, 2003.
- [6] K. Asano and T. Iwata, “Source model for strong ground motion generation in the frequency range 0.1-10 Hz during the 2011 Tohoku earthquake,” Earth Planets Space, Vol.64, No.12, pp. 1111-1123, 2012.
- [7] H. Kawabe and K. Kamae, “Source Modeling of the 2011 Off the Pacific Coast of Tohoku Earthquake,” Journal of Japan Association for Earthquake Engineering, Vol.13, No.2, pp. 75-87, 2013.
- [8] S. Kurahashi, and K. Irikura, “Short-period source model of the 2011
*M*9.0 Off the Pacific coast of Tohoku earthquake,” Bull. Seism. Soc. Am., Vol.103, No.2B, pp. 1373-1393, 2013._{w} - [9] S.-J. Lee, B.-S. Huang, M. Ando, H.-C. Chiu, and J.-H.Wang, “Evidence of large scale repeating slip during the 2011 Tohoku-Oki earthquake,” Geophys. Res. Lett., Vol.38, L19306, 2011.
- [10] Y. Yokota, K. Koketsu, Y. Fujii, K. Satake, S. Sakai, M. Shinohara, and T. Kanazawa, “Joint inversion of strong motion, teleseismic, geodetic, and tsunami datasets for the rupture process of the 2011 Tohoku earthquake,” Geophys. Res. Lett., Vol.38, L00G21, 2011.
- [11] Y. Yoshida, H. Ueno, D. Muto, and S. Aoki, “Source process of the 2011 off the Pacific coast of Tohoku Earthquake with the combination of teleseismic and strong motion data,” Earth Planets Space, Vol.63, pp. 565-569, 2011.
- [12] T. Ito, K. Ozawa, T. Watanabe, and T. Sagiya, “Slip distribution of the 2011 off the Pacific coast of Tohoku Earthquake inferred from geodetic data,” Earth Planets Space, Vol.63, No.7, pp. 627-630, 2011.
- [13] K. Koketsu, Y. Yokota, N. Nishimura, Y. Yagi, S. Miyazaki, K. Satake, Y. Fujii, H. Miyake, S. Sakai, Y. Yamanaka, and T. Okada, “A unified source model for the 2011 Tohoku earthquake,” Earth Planet. Sci. Lett., Vol.310, Nos.3-4, pp. 480-487, 2011.
- [14] S. Miyazaki, J. Jeffery, J. McGuire, and P. Segall, “Seismic and aseismic fault slip before and during the 2011 off the Pacific coast of Tohoku Earthquake,” Earth Planets Space, Vol.63, No.7, pp. 637-642.
- [15] S. Ozawa, T. Nishimura, H. Suito, T. Kobayashi, M. Tobita, and T. Imakiire, “Coseismic and postseismic slip of the 2011 magnitude-9 Tohoku-Oki earthquake, Nature, Vol.475, pp. 373-376, 2011.
- [16] Y. Fujii, K. Satake, S. Sakai, M. Shinohara, and T. Kanazawa “Tsunami source of the 2011 off the Pacific coast of Tohoku Earthquake,” Earth, Planets and Space, Vol.63, No.7, pp. 815-820, 2011.
- [17] Y. Hayashi, H. Tsushima, K. Hirata, K. Kimura, and K. Maeda, “Tsunami source area of the 2011 off the Pacific coast of Tohoku Earthquake determined from tsunami arrival times at offshore observation stations,” Earth Planets Space, Vol.63, pp. 809-813, 2011.
- [18] A. R. Gusman, Y. Tanioka, S. Sakai, and H. Tsushima “Source model of the great 2011 Tohoku earthquake estimated from tsunami waveforms and crustal deformation data,” Earth Planet. Sci. Lett., pp. 341-344, pp. 234-244, 2012.
- [19] H. Si and S. Midorikawa, “New attenuation relationship for peak ground acceleration and velocity considering effects of fault type and site condition,” J. Struct. Constr,. Eng. AIJ 523, pp. 63-70, 1999a (in Japanese).
- [20] H. Si and S.Midorikawa, “Attenuation relationships of peak ground acceleration and velocity considering effects of fault type and site condition,” in Proc. 12
^{th}World Conference on Earthquake Engineering, Paper No.532, 1999b. - [21] T. Takemoto, T. Furumura, T. Saito, T. Maeda, and S. Noguchi, “Spatial- and frequency-dependent properties of site amplification factors in Japan derived by the coda normalization method,” Bull. Seism. Soc. Am., Vol.102, No.4, pp. 1462-1476, 2012.
- [22] K. Koketsu, K. Hatayama, T. Furumura, Y. Ikegami, and S. Akiyama, “Damaging long-period ground motions from the 2003
*M*8.3 Tokachi-oki, Japan, earthquake,” Seismol. Res. Lett., Vol.76, No.1, pp. 67-73, 2005._{w} - [23] K. Hatayama, T. Kanno, and K. Kudo, “Control factors of spatial variation of long-period strong ground motions in the Yufutsu sedimentary basin, Hokkaido, during the
*M*8.0 2003 Tokachi-oki, Japan, earthquake,” Bull Seism. Soc Am, Vol.97, pp. 1308-1323, 2007._{w} - [24] K. Hatayama, “Lessons from the 2003 Tokachi-oki, Japan, earthquake for prediction of long-period strong ground motions and sloshing damage to oil storage tanks,” J. Seismol, Vol.12, pp. 255-263, 2008.
- [25] K. Koketsu, H. Miyake, Afnimar, and Y. Tanaka, “A proposal for a standard procedure of modeling 3-D velocity structures and its application to the Tokyo metropolitan area, Japan,” Tectonophysics, Vol.472, pp. 290-300, 2009.
- [26] T. Furumura and T. Hayakawa, “Anomalous propagation of longperiod ground motions recorded in Tokyo during the 23 October 2004 Niigata-ken Chuetsu (
*M*6.6) earthquake, Japan,” Bull. Seism. Soc. Am., Vol.97, pp. 863-880, 2007._{w} - [27] T. Hayakawa, T. Furumura, and Y. Yamanaka, “Simulation of strong ground motions caused by the 2004 off the Kii peninsula earthquakes,” Earth Planets Space, Vol.57, pp. 191-196, 2005.
- [28] H. Miyake and K. Koketsu, “Long-period ground motions from a large offshore earthquake: The case of the 2004 off the Kii peninsula earthquake, Japan,” Earth Planets Space, Vol.57, pp. 203-207, 2005.
- [29] T. Furumura, T. Hayakawa, M. Nakamura, K. Koketsu, and T. Baba, “Development of long-period ground motions from the Nankai Trough, Japan, earthquakes: Observations and computer simulation of the 1944 Tonankai (
*M*8.1) and the 2004 SE Off-Kii Peninsula (_{w}*M*7) Earthquakes,” Pure Appl. Geophys., Vol.165, pp. 585-607, 2008._{w} - [30] T. Furumura and M. Nakamura, “Recovering of strong motion record of the 1944 Tonankai earthquake and long period ground motion in Kanto region,” Butsuri-Tansa, Vol.59, No.4, pp. 337-351, 2006.
- [31] T. Furuzawa, “Group velocities of surface waves from near earthquakes around Japan,” J. Phys. Earth, Vol.24, pp. 131-147, 1976.
- [32] T. Yamashita and R. Sato, “Correlation of tsunami and sub-oceanic Rayleigh wave amplitudes possibility of the use of Rayleigh wave in tsunami warning system,” J. Phys. Earth, Vol.24, pp. 397-414, 1976.
- [33] S. Tsuno, H. Yamanaka, S. Midorikawa, S. Yamamoto, H, Miura, S. Sakai, N. Hirata, K. Kasahara, H. Kimura, and T. Aketagawa, “Characteristics of long-period ground motions in the Tokyo metropolitan area and its vicinity, by recording data of the 2011 off the Pacific coast of Tohoku earthquake (
*M*9.0) and the aftershocks,” Journal of Japan Association for Earthquake Engineering, Vol.12, No.5, pp. 102-116, 2012._{w} - [34] T. Yuzawa and H. Nagumo, “Factors of variability and measures for the shakeability of long-period ground motion – Kanto basin as an example –,” Journal of Japan Association for Earthquake Engineering, Vol.12, No.2, pp. 41-59, 2012.

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