Seismic reflection profiling across the Itoigawa-Shizuoka Tectonic Line at Matsumoto, Central Japan

Ikeda, Yasutaka; Iwasaki, Takaya; Satō, Hiroshi; Matsuta, Nobuhisa; Kozawa, Takeshi

doi:10.1186/bf03353356

Cited by 14 publications

(14 citation statements)

References 7 publications

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“…The low-angle fault geometry of the ISTL active fault system at the depth more than 2-km is also demonstrated by seismic reflection profile in Matsumoto (Matsumoto 2002 in Fig. 1; Ikeda et al, 2004). This geometry well accords to the velocity structure obtained by the reprocessing of refraction data of the 1987 seismic line (Fig.…”

Section: Fault Geometry Based On the Seismic Reflection Profilessupporting

confidence: 57%

“…The central part of the ISTL forms active fault systems with high slip-rate of 4-9 mm/y Ikeda et al, 2004). However, the northernmost part of ISTL, north of Hakuba, shows no evidence of late Quaternary faulting (Togo et al, 1996).…”

Section: Geological Settingmentioning

confidence: 99%

“…For this purpose, multi-disciplinary research to reveal the crustal structure has been carried out, including seismic reflection profiling , seismic refraction/wide-angle reflection profiling (Imai et al, 2004;Takeda et al, 2004), seismic tomography , receiver function analysis (Yoshimoto et al, 2004;Abe et al, 2004), and resistivity structure by magnetotelluric (MT) method (Ogawa et al, 2002) across the northern part of the ISTL active fault system. In this paper, we try to synthesize the crustal structure of the northern Fossa Magna region and deep geometry of the ISTL active fault system based on the above-mentioned results and other related seismic profiles Ikeda et al, 2004;Elouai et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Seismological and geological characterization of the crust in the southern part of northern Fossa Magna, central Japan

et al. 2014

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The northern Fossa Magna (NMF) is a Miocene rift basin formed in the final stages of the opening of the Sea of Japan. The northern part of Itoigawa-Shizuoka Tectonic Line (ISTL) bounds the western part of the NMF and forms an active fault system that displays one of the largest slip rates in the Japanese islands. Reflection and refraction/wide-angle reflection profiling and earthquake observations by a dense array were undertaken across the northern part of ISTL in order to delineate structures in the crust, and deep geometry of the active fault systems. The ISTL active fault system at depth (ca. 2 km) shows east-dipping low-angle in Omachi and Matsumoto and is extended beneath the Central Uplift Zone and Komoro basin keeping the same dip-angle down to ca. 15 km. The upper part of the crust beneath the Central Uplift Zone is marked by the high Vp and high resistivity zone. Beneath the folded zone of the NMF, the middle to lower crust shows low Vp, low resistivity and more reflective features. The balanced geologic cross-section based on the reflection profiles suggests that the shortening deformation since the late Neogene was produced by the basin inversion of the Miocene low-angle normal fault.

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Section: Fault Geometry Based On the Seismic Reflection Profilessupporting

confidence: 57%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismological and geological characterization of the crust in the southern part of northern Fossa Magna, central Japan

et al. 2014

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“…This dip angle is supported by the present profiles and is consistent with that of Sato et al (2004) and Ikeda et al (2004). In Toyoshina, three lower terraces can be identified along the active fault by Matsuta (1999), and in Hakuba, one lower terrace can be identified according to Togo et al (1996).…”

Section: Hakubasupporting

confidence: 72%

“…• for the northern ISTL active fault system is also supported by data of Sato et al (2004) and Ikeda et al (2004).…”

Section: S-wave Reflection Profile In Kamishiro Basinmentioning

confidence: 99%

The slip-rate along the northern Itoigawa-Shizuoka tectonic line active fault system, central Japan

2014

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The slip-rates on the northern extent of Itoigawa-Shizuoka tectonic line (ISTL) are estimated based on seismic reflection profiles, drill core data and analysis of tectonic geomorphology. The ISTL is a major tectonic line that passes through the Honshu Island of Japan, and its northern and central segments form an active fault system characterized by high slip-rates. In the Kamishiro basin, near the northern end of the ISTL active fault system, the rate of net slip is estimated to be 4.4-5.4 m/kyr over the last 28 ka, with a vertical-separation-rate of 2.2-2.7 m/kyr. In the Omachi area, south of the Kamishiro basin, the Quaternary slip-rate is estimated to be at least 2.9 m/kyr based on the balanced cross-section derived from reflection profiles and surface geology. The dip angle of 30• determined from the Omachi seismic profile suggests a vertical-separation-rate of at least 1.5 m/kyr. Based on compiled evidence from the available geomorphological and paleo-seismological data, vertical-slip-rates of 1.0-2.9 m/kyr are inferred for the region between Hakuba and Toyoshina over the past 3 ka. The northern ISTL exhibits dip-slip-rate of at least 2.9 m/kyr, with a constant average slip-rate of 2.0-5.8 m/kyr since the Early Quaternary. A paleoseismological data and long-term slip-rate along the northern ISTL has potential for a large earthquake.

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Active nappe with a high slip rate: Seismic and gravity profiling across the southern part of the Itoigawa-Shizuoka Tectonic Line, central Japan

et al. 2009

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Seismic reflection profiling across the Itoigawa-Shizuoka Tectonic Line at Matsumoto, Central Japan

Cited by 14 publications

References 7 publications

Seismological and geological characterization of the crust in the southern part of northern Fossa Magna, central Japan

Seismological and geological characterization of the crust in the southern part of northern Fossa Magna, central Japan

The slip-rate along the northern Itoigawa-Shizuoka tectonic line active fault system, central Japan

Active nappe with a high slip rate: Seismic and gravity profiling across the southern part of the Itoigawa-Shizuoka Tectonic Line, central Japan

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