Abstract
We studied the applicability of two types of existing three-dimensional (3-D) basin velocity structure models of the Osaka basin, western Japan for long-period ground motion simulations. We synthesized long-period (3–20 s) ground motions in the Osaka basin during a M6.5 earthquake that occurred near the hypothetical Tonankai earthquake source area, approximately 200 km from Osaka. The simulations were performed using a 3-D finite-difference method with nonuniform staggered grids using the two basin velocity structure models. To study the ground motion characteristics inside the basin, we evaluated the wave field inside the basin using the transfer functions derived from the synthetics at the basin and a reference rock site outside the basin. The synthetic waveforms at the basin site were obtained by a convolution of the calculated transfer function and the observed waveform at the reference rock site.
First, we estimated the appropriate Q values for the sediment layers. Assuming that the Q value depends on the S wave velocity V S and period T, it was set to Q = (1/3V S)(T 0/T) where V S is in m/s and the reference period T 0 is 3.0 s. Second, we compared the synthetics and the observations using waveforms and pseudovelocity response spectra, together with a comparison of the velocity structures of the two basin models. We also introduced a goodness-of-fit factor to the pseudovelocity response spectra as an objective index. The synthetics of both the models reproduced the observations reasonably well at most of the stations in the central part the basin. At some stations, however, especially where the bedrock depth varies sharply, there were noticeable discrepancies in the simulation results of the models, and the synthetics did not accurately reproduce the observation. Our results indicate that the superiority of one model over the other cannot be determined and that an improvement in the basin velocity structure models based on simulation studies is required, especially along the basin edges. We also conclude that our transfer function method can be used to examine the applicability of the basin velocity structure models for long-period ground motion simulations.
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References
Aoi S, Obara K, Hori S, Kasahara K, Okada Y (2001) New Japanese uphole/downhole strong-motion observation network: KiK-net. Seismol Res Lett 72:239
Bai L, Kawasaki I, Zhang T, Ishikawa Y (2006) An improved double-difference earthquake location algorithm using sP phases: application to the foreshock and aftershock sequences of the 2004 earthquake offshore of the Kii peninsula, Japan (Mw=7.5). Earth Planets Space 58:823–830
Cho I, Tsurugi M, Iwata T, Kagawa T, Zhao B (2004) Modeling of the spectral amplitude characteristics at the strong motion observation sites in the Osaka basin, Japan. Proc. 13th World Conf. Earthq. Eng., Vancouver, BC, Canada, pp 825
Cho I, Tsurugi M, Kagawa T, Iwata T (2006) Modeling of deep sedimentary velocity structure for evaluation of broadband strong ground motions: Site-amplification spectra in Osaka sedimentary basin. J Japan Assoc Earthq Eng 6(4):113–132 (in Japanese with English abstract)
Gassmann F (1951) Elastic waves through a packing of spheres. Geophysics 16:673–685
Graves RW (1996) Simulating seismic wave propagation in 3D elastic media using staggered-grid finite differences. Bull Seismol Soc Am 86:1091–1106
Horikawa H, Mizuno K, Satake K, Sekiguchi H, Kase Y, Sugiyama Y, Yokota H, Suehiro M, Pitarka A (2002) Three-dimensional subsurface structure model beneath the Osaka Plain. Annual Report on Active Fault and Paleoearthquake Researches, Geological Survey of Japan/AIST 2:291–324 (in Japanese with English abstract)
Horikawa H, Mizuno K, Ishiyama T, Satake K, Sekiguchi H, Kase Y, Sugiyama Y, Yokota H, Suehiro M, Yokokura T, Iwabuchi Y, Kitada N, Pitarka A (2003) A three-dimensional model of the subsurface structure beneath the Osaka sedimentary basin, southwest Japan, with fault-related structural discontinuities. Annual Report on Active Fault and Paleoearthquake Researches, Geological Survey of Japan/AIST 3:225–259 (in Japanese with English abstract)
Iwata T, Asano K (2005) Long-period ground motion during the 2004 earthquake sequence off the Kii peninsula and the Tokai District. Journal of the Seismological Society of Japan 58:273–279 (in Japanese with English abstract)
Iwaki A, Iwata T (2006) Long period ground motion characteristics of the 2004 Off Kii-Peninsula earthquakes in Osaka basin. Abstracts of Japan Geoscience Union Meeting S116-P007
Iwata T, Kagawa T, Petukhin A, Onishi Y (2006) Basin and crustal structure model for strong motion simulation in Kinki, Japan. Proc. 3rd Int. Symp. Effect of Surface Geology on Seismic Motion, Grenoble, France, pp 435–442
Iwata T, Kagawa T, Petukhin A, Onishi Y (2008) Basin and crustal velocity structure models for the simulation of strong ground motions in the Kinki area, Japan. J Seismol DOI 10.1007/s10950-007-9086-7
Kagawa T, Sawada S, Iwasaki Y, Nanjo J (1993) Modeling the deep sedimentary structure in the Osaka basin. Proc. 22nd JSCE Earthquake Engineering Symposium, pp 199–202 (in Japanese)
Kagawa T, Irikura K, Takemura M (1998a) Estimation of strong ground motion—present status and future. Journal of the Seismological Society of Japan 51:339–454 (in Japanese with English abstract)
Kagawa T, Sawada S, Iwasaki Y, Nanjo J (1998b) S-wave velocity structure model of the Osaka sedimentary basin derived from microtremor array observations. Journal of the Seismological Society of Japan 51:31–40 (in Japanese with English abstract)
Kagawa T, Zhao B, Miyakoshi K, Irikura K (2004a) Modeling of 3D basin structures for seismic wave simulations based on available information on the target area: case study of the Osaka basin. Bull Seismol Soc Am 94:1353–1368
Kagawa T, Iemura H, Irikura K, Toki K (2004b) Strong ground motion observation by the Committee of Earthquake Observation and Research in the Kansai Area (CEORKA). J Japan Assoc Earthq Eng 4(3):128–133
Kato K, Yamazoe M, Takemura M (2001) Azimuth estimation of KiK-net borehole seismometers distributed in Cyugoku and Shikoku regions, Japan—on the basis of strong motion records from the Tottoriken-seibu and the Geiyo earthquakes. Journal of the Seismological Society of Japan 54:421–429 (in Japanese with English abstract)
Kawabe H, Kamae K (2005) Estimation of Q value for long period ground motion simulation in Osaka basin. Prog. Abst. 2nd Int. Workshop on Strong Ground Motion Prediction and Earthquake Tectonics in Urban Areas, Tokyo, pp 155–158
Kinoshita S (1998) Kyoshin Net (K-NET). Seismol Res Lett 69:309–332
Koketsu K, Higashi S (1992) Three-dimensional topography of the sediment/basement interface in the Tokyo Metropolitan area, central Japan. Bull Seismol Soc Am 82:2328–2349
Koketsu K, Hatayama K, Furumura T, Ikegami Y, Akiyama S (2005) Damaging long-period ground motions from the 2003 Mw 8.3 Tokachi-oki, Japan, earthquake. Seismol Res Lett 76:67–73
Miyake H, Koketsu K (2005) Long-period ground motions from a large offshore earthquake: The case of the 2004 off the Kii peninsula earthquake. Earth Planets Space 47:203–207
Miyakoshi K, Kagawa T, Sawada S, Echigo T, Horie Y (1997) Modeling the deep sedimentary structure in the Osaka basin (2). Proc. 24th JSCE Earthquake Engineering Symposium, pp 33–36 (in Japanese)
Miyakoshi K, Kagawa T, Zhao B, Tokubayashi M, Sawada S (1999) Modeling the deep sedimentary structure in the Osaka basin (3). Proc. 25th JSCE Earthquake Engineering Symposium, pp 185–188 (in Japanese)
Pitarka A (1999) 3D elastic finite-difference modeling of seismic motion using staggered grids with nonuniform spacing. Bull Seismol Soc Am 89:54–68
Pitarka A, Graves R, Somerville P (2004) Validation of a 3D velocity model of the Puget Sound Region based on modeling ground motion from the 28 February 2001 Nisqually earthquake. Bull Seismol Soc Am 94:1670–1689
Wassel P, Smith WHF (1998) New, improved version of the Generic Mapping Tools released. EOS Trans Am Geophys Union 79:579
Yamada N, Iwata T (2005) Long-period ground motion simulation in the Kinki area during the MJ7.1 foreshock of the 2004 off the Kii peninsula earthquakes. Earth Planets Space 57:197–202
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Iwaki, A., Iwata, T. Validation of 3-D basin structure models for long-period ground motion simulation in the Osaka basin, western Japan. J Seismol 12, 197–215 (2008). https://doi.org/10.1007/s10950-008-9088-0
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DOI: https://doi.org/10.1007/s10950-008-9088-0