文献一覧: 石田完 (著者)

12 0 0 0 OA 積雪の音響特性

著者: 石田完
出版者: 北海道大学低温科学研究所
雑誌: 低温科學. 物理篇 (ISSN:04393538)
巻号頁・発行日: vol.22, pp.59-72, 1964-03-25

2022-01-07 20:48:57
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http://hdl.handle.net/2115/18007

3 0 0 0 OA 積雪の吸音率について

著者: 石田完小野寺重男
出版者: 北海道大學低温科學研究所
雑誌: 低温科學. 物理篇 (ISSN:04393538)
巻号頁・発行日: vol.12, pp.17-24, 1954-03-30

2016-01-29 11:10:12
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http://hdl.handle.net/2115/17872

2 0 0 0 IR やまと山脈調査旅行の途次における人工地震探査

著者: 石田完 Tamotsu ISHIDA
雑誌: 南極資料 (ISSN:00857289)
巻号頁・発行日: vol.14, pp.1156-1163, 1962-01

Refraction and reflection seismic studies were made on the route between from Station No. 102 and Station No. 227 during the trip across the Yamato Mountains (See Fig. 1). We used the seismic equipment with 24 recording channels and geophones having the natural frequency of 20 cps (type M-3), supplied by the Electro-Technical Labs. It was mounted on a caboose hauled by a snow-car, as shown in Figs. 2 and 3. The 12 geophones were placed at intervals of 20 m, straightly along the traverse route. The shots for the reflection shooting ranged from 1 to 2 kg of TNT placed in 2 shot-holes, drilled 1 or 2 m apart at depths between 4 m and 6 m in the center of the 12 geophones. Velocity variation with depth for P wave was calculated for Station No. 95 using the equation: h = 1/π∫^D_0cosh^<-1>(V_D)/(V_x)dx, where h=depth at which velocity V_D occurs; x=horizontal distance; V_x=velocities from travel time curve in Fig. 6. The travel time curve was plotted from the results of refraction shooting at Station No. 95. Fig. 7 shows variation of the velocity of P wave with depth. Further, from the curve, density variation with depth in neve was deduced by the equation: ρ=2.21×10^<-4>V_P+0.059, whereρis density in g/cm^3 and V_p is velocity of P wave in m/s. The result is shown in Fig. 12. As is known from the figure the rate of increase of density with depth in this area is larger than in the Ross Shelf and Queen Maud Land. The reflection shooting was performed at intervals of 10 km on the route of 270 km in total length. Ice thickness profile obtained from the seismic prospecting is shown in Fig. 10. As seen in this figure, 3 deep valleys were detected beneath the traverse route. These may be the sources of the Shirase Glacier.