2 SSE 1 GEONET 26 Hi-net 4 BAYTAP-G (Tamura et al., 1991) GEONET (F3) (, 29) 935 ( ) SSE SSE Hi-net (Obara et al., 25) SSE SSE KT2H ( ) CBAH

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1 神 戸 大 学 都 市 安 全 研 究 センター 研 究 報 告, 第 19 号, 平 成 27 年 3 月 : The 27 and 211 Boso slow slip events: a driving process for the accompanying earthquake swarm 1) Hitoshi Hirose 2) Takanori Matsuzawa 3) Takeshi Kimura 4) Hisanori Kimura 2 7 (SSE) SSE SSE GNSS Network Inversion Filter (, Kanamori, 1971; Wald and Somerville, 1995) (SSE) 2 7 (Sagiya, 24; Ozawa et al., 23, 27; Hirose et al., 212) (Ozawa, 214; Fukuda et al., 214) SSE (, Sagiya, 24) SSE (, Peng and Gomberg, 21) SSE (, Segall et al., 26) Salton Trough (Lohman and McGuire, 27) (Delahaye et al., 29) (Vallée et al., 213) GNSS (Global Navigation Satellite System) GEONET (NIED) Hi-net ( ) ( ) (Obara et al., 25) NIED SSE SSE 1

2 2 SSE 1 GEONET 26 Hi-net 4 BAYTAP-G (Tamura et al., 1991) GEONET (F3) (, 29) 935 ( ) SSE SSE Hi-net (Obara et al., 25) SSE SSE KT2H ( ) CBAH ( ) 27 SSE ( 27 SSE) SSE ( 211 SSE) SSE 211 SSE 27 SSE.66 µrad KT2H 25 mm ( ) 211 SSE.91 µrad (KT2H) 4 mm (95226) 27 SSE SSE SSE (M) SSE M AM PH NA PA Ref (M 7.9) 5 NRTH CBAH Boso Pen CH2H km KT2H 36 N 35 N 5 km 139 E 14 E 141 E 1:. SSE (, 1994; Kimura et al., 29). GNSS. GNSS (GEONET 935 ).. (Kimura et al., 26). NA:, AM:, PA:, PH:. 2

3 (a) (b) NRTH E NRTH N N, E down NRTH E NRTH N CH2H E CH2H N N, E down CH2H E CH2H N CBAH E CBAH E CBAH N CBAH N KT2H N KT2H E KT2H E (c).1 µ rad 15 hpa [ / ] [hpa] [mm/ ] Aug 27 KT2H N (d).1 µ rad 15 hpa [ / ] [hpa] [mm/ ] Oct 211 Nov U 9324 U 9324 N 9324 N 9324 E 9324 E 9325 U 9325 U 9325 N 9325 N 9325 E 9325 E U U N N 2 mm E 2 mm E Aug Oct 211 Nov 211 2: 27 (a, c) 211 (b, d) SSE (a, b) GNSS (c, d)... (a, b) (c, d). (a, b) SSE (3 km ). 3

4 3 Network Inversion Filter (Segall and Matthews, 1997; Hirose and Obara, 21) SSE 1 1 km (, 27) (Kimura et al., 26) N165 E Okada (1992) 4 (a) 27 SSE Aug 13 : Aug 15 : Aug 16 : Aug 17 : Aug 19 : (b) 211 SSE Oct 25 : Oct 27 : Oct 28 : Oct 29 : Oct 3 : :. (a) 27 SSE, (b) 211 SSE SSE 211 SSE 27 SSE ( 4 A) 211 SSE 27 SSE 2 SSE 4 27 SSE ( 4 A) 211 SSE ( 4 B) 27 SSE 4

5 (a) (b) 35.5 N A A B B 35 N 14 E 14.5 E 141 E 14 E 14.5 E 141 E (mm) : 27 SSE 211 SSE ( ). SSE. SSE. A 211 SSE 27 SSE SSE 27 SSE Nm ( M w 6.6) 211 SSE Nm (M w 6.6) 2 SSE 5 27 SSE ( 5a) SSE SSE 211 SSE ( 5b) SSE SSE SSE ( Hirose et al. (214) ) GEONET 5

6 (a) 3 [1 13 Nm/s] [N/6h] (b) August, 27 [1 13 Nm/s] [N/6h] October, 211 5: SSE ( ) (6 ). (a) 27 SSE, (b) 211 SSE. 1 ( ). 6 ( ). 6

7 Delahaye, E. J., J. Townend, M. E. Reyners, and G. Rogers (29), Microseismicity but no tremor accompanying slow slip in the Hikurangi subduction zone, New Zealand, Earth Planet. Sci. Lett., 277(1 2), Fukuda, J., A. Kato, K. Obara, S. Miura, and T. Kato (214), Imaging of the early acceleration phase of the Boso slow slip event, Geophys. Res. Lett., 41(21), , doi:1.12/214gl6155. Kanamori, H. (1971), Faulting of the great Kanto earthquake of 1923 as revealed by seismological data, Bull. Earthq. Res. Inst. Univ. Tokyo, 49, Hirose, H., and K. Obara (21), Recurrence behavior of short-term slow slip and correlated nonvolcanic tremor episodes in western Shikoku, southwest Japan, J. Geophys. Res., 115, BA21, doi:1.129/28jb65. Hirose, H., H. Kimura, B. Enescu, and S. Aoi (212), Recurrent slow slip event likely hastened by the 211 Tohoku earthquake, Proc. Nat. Acad. Sci. USA, 19(38), Hirose, H., T. Matsuzawa, T. Kimura, and H. Kimura (214), The Boso slow slip events in 27 and 211 as a driving process for the accompanying earthquake swarm, Geophys. Res. Lett., 41, 214GL59791, doi:1.12/214gl Kimura, H., K. Kasahara, T. Igarashi, and N. Hirata (26), Repeating earthquake activities associated with the Philippine Sea plate subduction in the Kanto district, central Japan: A new plate configuration revealed by interplate aseismic slips, Tectonophys., 417, Kimura, H., K. Kasahara, and T. Takeda (29), Subduction process of the Philippine Sea Plate off the Kanto district, central Japan, as revealed by plate structure and repeating earthquakes, Tectonophys., 472, Lohman, R. B., and J. J. McGuire (27), Earthquake swarms driven by aseismic creep in the Salton Trough, California, J. Geophys. Res., 112(B4), doi:1.129/26jb4596. (29), GPS GEONET,, 118, 1 8. Obara, K., K. Kasahara, S. Hori, and Y. Okada (25), A densely distributed high-sensitivity seismograph network in Japan: Hi-net by National Research Institute for Earth Science and Disaster Prevention, Rev. Sci. Instrum., 76, 2131, doi:1.163/ Okada, Y. (1992), Internal deformation due to shear and tensile faults in a half-space, Bull. Seism. Soc. Am., 82, Ozawa, S., S. Miyazaki, Y. Hatanaka, T. Imakiire, M. Kaidzu, and M. Murakami (23), Characteristic silent earthquakes in the eastern part of the Boso peninsula, Central Japan, Geophys. Res. Lett. 3(6), doi:1.129/22gl Ozawa, S., H. Suito, and M. Tobita (27), Occurrence of quasi-periodic slow-slip off the east coast of the Boso peninsula, Central Japan, Earth Planets Space, 59, Ozawa, S. (214), Shortening of recurrence interval of Boso slow slip events in Japan, Geophys. Res. Lett., 41(8), , doi:1.12/214gl672. Peng, Z., and J. Gomberg (21), An integrated perspective of the continuum between earthquakes and slow-slip phenomena, Nature Geosci, 3(9), Sagiya, T. (24), Interplate coupling in the Kanto district, central Japan, and the Boso peninsula silent earthquake in May 1996, Pure Appl. Geophys., 161, Segall, P., and M. Matthews (1997), Time dependent inversion of geodetic data, J. Geophys. Res., 12(B1),

8 Segall, P., E. K. Desmarais, D. Shelly, A. Miklius, and P. Cervelli (26), Earthquakes triggered by silent slip events on Kilauea volcano, Hawaii, Nature, 442, ,, (27),,, No. 57, (1994), 1923, 2, 46, Tamura, Y., T. Sato, M. Ooe, and M. Ishiguro (1991), A procedure for tidal analysis with a Bayesian information criterion, Geophys. J. Int., 14(3), Vallée, M. et al. (213), Intense interface seismicity triggered by a shallow slow slip event in the Central Ecuador subduction zone, J. Geophys. Res., 118(6), , doi:1.12/jgrb Wald, D. J., and P. G. Somerville (1995), Variable-slip rupture model of the great 1923 Kanto, Japan, earthquake: geodetic and body-waveform analysis, Bull. Seism. Soc. Am., 85, ),, ; 2),, ; 3),, ; 4),, 8

9 The 27 and 211 Boso slow slip events: a driving process for the accompanying earthquake swarm Hitoshi Hirose Takanori Matsuzawa Takeshi Kimura Hisanori Kimura Abstract Near the Boso Peninsula, central Japan, slow slip events (SSEs) accompanied by earthquake swarms repeatedly occur every 2 to 7 years. We apply a Network Inversion Filter to tilt change and GNSS displacement data simultaneously in order to obtain the spatiotemporal slip evolution of the Boso Peninsula SSEs in 27 and 211. The inverted slip propagations correlate well both spatially and temporally with the migration of the accompanying seismicity. This indicates that the Boso slow slip is a major driving process for earthquake swarm activities. 9

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