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Auxiliary Materials for MS# 2013GL055809 Active blind thrusts beneath the Tokyo metropolitan area: Seismic hazards and inversion tectonics Tatsuya Ishiyama*+, Hiroshi Sato*, Naoko Kato*, Toshio Nakayama*, Susumu Abe# (*Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan # JGI Inc., 1-5-21 Otsuka, Tokyo 112-0012, Japan) Corresponding Author + [email protected] Geophysical Research Letters, 2013 1 2 1 In addition to the manuscript itself, we provide supplemental figures S1 to S3 and 2 tables S1 and S2 for making it more readable. 3 4 Figure Captions 5 6 2013GL055809fs01.eps 7 Figure S1. 8 the Kanto area (modified from Geological Society of Japan, Eds., 2008). 9 Paleomagnetic polarity timescale is modified from Cande and Kent [1995]. 10 Stratigraphic columns of Neogene sedimentary basin deposits in Oxgen isotope record is modified from Shackleton [1995]. 11 12 2013GL055809fs02a.tif 13 Figure S2(a). 14 magenta line in Figure 1, showing reactivated normal faults and normal 15 fault-related grabens. No vertical exaggeration. Red lines indicate fault 16 trajectories that deform at least middle Pleistocene units, and blue lines are 17 inactive faults. Interpreted deep seismic reflection profile Line A, marked by a 18 19 2013GL055809fs02b.eps 20 Figure S2(b). 21 normal faults since the early Pleistocene, created by retro-deforming the 22 interpreted geologic section in Figure S2a. Area-balanced geologic cross section before reactivation of 23 24 2013GL055809fs02c.eps 25 Figure S2(c). P-wave velocity structure along the Line A based on refraction 26 analysis using simultaneously obtained shot records with repeated shooting of 27 Vibroseis trucks. 28 29 2013GL055809fs03a.eps 30 Figure S3(a). Geologic map of the fold scarp above the Ayasegawa fault that 31 deforms the last interglacial marine and fluvial terrace deposits, with the 32 locations of the high-resolution seismic line and shallow boreholes used in this 33 study (modified from Ishiyama et al., 2005). The location of the deep seismic 34 reflection profile in Figures 2 and S2 is also shown. 35 36 2013GL055809fs03b.eps 37 Figure S3(b). Detailed geomorphology of folded terraces, locations of the 38 seismic line and drilled boreholes in this study are shown. 39 40 41 Table Captions 42 43 2013GL055809ts01.eps 44 Table S1. 45 reflection profile Line A [Sato et al., 2006]. Parameters for data acquisition and processing of the deep seismic 46 47 2013GL055809ts02.eps 48 Table S2. 49 high-resolution seismic profiles across the base of the forelimb above the Parameters for data acquisition and processing of the 50 Ayasegawa fault [Ishiyama et al., 2005]. 51 52 53 References 54 Cande, S. C., and D. V. Kent (1995), Revised calibration of the geomagnetic 55 polarity timescale for the Late Cretaceous and Cenozoic, J. Geophys. Res., 56 100(B4), 6093–6095, doi:10.1029/94JB03098. 57 58 59 Geological Society of Japan (Eds.) (2008), Geology of Kanto area, 570 pp., Asakura Publishing, Tokyo. Ishiyama, T., K. Mizuno, Y. Sugiyama, T. Sugai, H. Nakazato, S. Hachinohe, M. 60 Suehiro, and T. Hosoya (2005), New evidence of active folding of the 61 northern Ayasegawa fault, constrained by tectonic geomorphology, borehole 62 stratigraphy, and seismic reflection data (in Japanese with English abstracts), 63 Annual Report on Active Fault and Paleoearthquake Research, 5, 29-37. 64 Sato, H., N. Hirata, T. Iwasaki, K. Koketsu, K. Ito, T. Ito, K. Kasahara, and N. 65 Kato (2006), Seismic Reflection Profiling in the Kanto Metropolitan 66 Area (2006 northern Kanto and Omiya-Noda lines), Annual report on 67 the Special Project for Earthquake Disaster Mitigation in Urban areas 68 (in Japanese), 233-238. 69 Shackleton, N. J. (1995), New data on the evolution of Pliocene climate 70 variability, in Paleoclimate and Evolution, with emphasis on human origins, 71 edited by E. S. Vrba, G. H. Denton, T. C. Partridge, and L. H. Burkle, pp. 72 242-248, Yale University Press, New Haven.