糸魚川－静岡構造線活断層系北部・松本地域における反射法地震探査

The Itoigawa-Shizuoka tectonic line (ISTL) active fault system shows complicated fault traces in the Matsumoto area, at the southern end of the northern part of the ISTL active fault system. In this area, there are two tectonic deformation zones; the clear sinistral fault (Gofukuji fault) and the anticline and reverse fault (Akagiyama fault). To clarify the relation between the two deformation zones, we conducted two high-resolution shallow seismic reflection surveys across Gofukuji and Akagiyama faults. The lengths of the seismic line are 1.6 and 1.9km, respectively, and the receiver interval was 10m and the shot point interval was 10m (Gofukuji seismic line) or 5m (Akagiyama seismic line). In the Gofukuji seismic line, we estimated the east-dipping Gofukuji frontal thrust and possible high-angle Gofukuji fault. The Akagiyama seismic profile demonstrates an asymmetric anticline with a steeper eastern limb associated with the west-dipping Akagiyama fault. Based on the tectonic geomorphological features and subsurface structure, it is considered that the two deformation zones were formed by a single main east-dipping fault with reverse and strike-slip displacements. Through slip partitioning, the high-angle Gofukuji fault shows sinstral displacements, and Gofukuji frontal thrust and Akagiyama fault accommodate shortening deformation

「クロマグロ完全養殖」の英語版「Full-Life Cycle Aquaculture of the Pacific Bluefin Tuna」の出版

研究種目：研究成果刊行助成金; 課題番号：KJ0

糸魚川－静岡構造線活断層系中部・富士見地域における反射法地震探査

The Itoigawa-Shizuoka tectonic line (ISTL) active fault system displays one of the largest slip rates in the Japanese islands. In the Fujimi area, the southern part of the ISTL active fault system, there are two faults, trending NW-SE, parallel to each other: the Aoyagi fault to the east and the Wakamiya fault to the west. The distance between the two faults is 1-2km. The Aoyagi fault is a west-dipping reverse fault and the Wakamiya fault is east-dipping sinistral fault. To clarify the subsurface geometry and their connectivity, we carried out high-resolution shallow seismic reflection profiling across the two faults. The length of the seismic line is 3.6km, and the receiver and shot point intervals are 10m. Common mid-point seismic reflection data were acquired using a 144-channel recording system and a mini-vibrator. Based on the obtained seismic section, we interpreted that the deeper extension of the Aoyagi fault shows a west-dipping fault surface at a moderate angle, and that the Walkamiya fault merges with the Aoyagi fault. In other words, the oblique slip on the ISTL is partitioned into the dip slip on the Aoyagi fault and the left lateral slip on the Wakamiya fault in shallow fluvial deposits

「クロマグロ完全養殖」の英語版「Full-Life Cycle Aquaculture of the Pacific Bluefin Tuna」の出版

研究代表者共同研究者共同研究者共同研究者共同研究者共同研究者共同研究者共同研究者共同研究者共同研究者共同研究者共同研究者publisher研究種目：研究成果刊行助成金; 課題番号：KJ0

伊那谷断層帯小黒川測線における浅層反射法地震探査 : データ取得と処理

Ina Valley Fault Zone consists mainly of two subparallel fault strands: the boundary fault and the frontal fault. The boundary fault is located at the foot of the Kiso range. The frontal fault is located several kilometers east of the boundary fault. Both faults are thrust faults with high rates of horizontal shortening. To reveal the subsurface structure of and relationship between these two faults, we carried out a high-resolution seismic reflection survey along the Oguro River in the northern Ina Valley. The source used in the survey was a mini-vibrator (T-15000). The source and receiver spacing was 10m, with 240-ch geophones used for recording. The seismic section after careful data processing shows that the boundary fault dips west at a fairly low angle and the frontal fault is likely to converge on the boundary fault at depth. Westward dip of basin-fill sediments becomes steeper with increasing depth, indicating that the basin-fill sediments are syntectonic