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Hisashi Miyoshi 《Journal of Oceanography》1986,42(1):69-74
The energy flux of the Japan Sea Tsunami of May 26, 1983 radiated offshore causing the destruction of ships in Shimane Prefecture, the fourth worst area hit. In 1960, a tsunami from Chile attacked the Pacific coast from the Ryukyu Islands to Adak Island Alaska. The energy flux of the latter was similar to that of the former. The angle formed at the origin off the Chilean coast by the energy flux was 68°48 or possibly slightly larger. The coincidence between the angle given by this process and that by the directivity theory of Miyoshi (1977) is good. The Sanriku District is located approximately on the center line of this angle. Judging from the fact that the Sanriku District was attacked most severely in 1960, it can be suspected that the energy flux was a little more sharply directed than estimated by the theory. The equivalent angle in the case of the Japan Sea Tsunami, which attacked the area from the tip of the Noto Peninsula to the east coast of the Korean Peninsula, was only 45°30 and the smaller angle can be explained as a refraction effect of the Yamato Bank. The above information should be useful for warnings of future tsunamis. 相似文献
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Hisashi Miyoshi 《Journal of Oceanography》1987,43(3):159-168
The run-up height reached by the tsunami of 1896 at the former Ryohri Village had been erroneously recognized as high as only 21.9 m. Our study (1983) renewed the figure of 38.2 m (Matsuo, 1933), which is now officially recognized.In 1980, we selected the spot, Raga, Tanohata Village, and, using a hand level, pointed out the decisive underestimation of the run-up height in Igi's report (1897). Our study, however, provided only circumstantial evidence that the maximum runup at the former Ryohri Village might be 38.2 m. In 1986, we directly studied the run-up height at the saddle point at Ohkubo, the former Ryohri Village using hand levels, and confirmed that it was at least as high as 36 m. Countermeasures for future tsunamis need major revisions, a part of which is the consideration on the combination of the large V-shaped Ryohri Bay and a neighboring small (V+U)-shaped bay. This consideration becomes essential and we show that the (V+U)-shaped bay is of the worst shape, basing on the survival ratios of individual small subhamlets, which have been recently ready for use (Yamashita, 1982). 相似文献
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If knowledge of our theories on the directivity of tsunamis had received worldwide attention, the following operations could have been carried out internationally just after the large earthquake of 19 September 1985 which occurred near Acapulco, Mexico. Having found the great circle, “line S” which is perpendicular to the coast around Acapulco, we could have calculated the angles between line S and line A and between line S and line D, where line A and line D are the great circle connecting Acapulco and Auckland, New Zealand and that connecting Acapulco and Duke of York Island (Chile), respectively. The resultant angles are 30?43′ and 41?49′(>68?48′/2), we could thereafter neglect the eastern half of the offshore energy flux. When we assume that the speed of trans-Pacific tsunami is 400 knots, the probability that the actual tsunami will come earlier than the calculated arrival time proves to be $$\frac{1}{{\sqrt {2\pi } }}\int_{ - {\text{ }}\infty }^{ - {\text{ }}0.689} {e^{ - t^{{2 \mathord{\left/ {\vphantom {2 2}} \right. \kern-\nulldelimiterspace} 2}} } dt = 0.2454} $$ Contact with New Zealand prior to the forecasted arrival time was essential, but the tsunami attention for the Japanese coast was unnecessary. Without such application of our directivity theories, frequent fruitless warnings will be issued for future trans-Pacific tsunamis. Quick improvements in warning procedures are required. 相似文献
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S. Miyoshi S. Haykawa H. Kunieda F. Nagase Y. Tawara 《Astrophysics and Space Science》1986,119(1):185-190
In order to investigate the structure and mechanism of active galactic nuclei through X-ray observation, detailed energy spectra are examined with the gas scintillation proportional counters on board TENMA. For three selected objects, PKS 2155-304, Centaurus A and IC 4329 A, the observational results in the intensity variation, the spectral shapes and the iron line features are presented.Paper presented at the IAU Third Asian-Pacific Regional Meeting, held in Kyoto, Japan, between 30 September–6 October, 1984. 相似文献
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Ocean Dynamics - We have produced an eddy-resolving local ensemble transform Kalman filter (LETKF)-based ocean research analysis (LORA) for the western North Pacific (WNP) and Maritime Continent... 相似文献
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Richard Saunders Rüdiger Kneissl Keith Grainge William F. Grainger Michael E. Jones Alessia Maggi Rhiju Das † Alastair C. Edge Anthony N. Lasenby G. G. Pooley Shigeru J. Miyoshi Taisuke Tsuruta Koujun Yamashita Yuzuru Tawara Akihiro Furuzawa Akihiro Harada Izamu Hatsukade 《Monthly notices of the Royal Astronomical Society》2003,341(3):937-940
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Y. Ezoe R. Fujimoto N.Y. Yamasaki K. Mitsuda T. Ohashi K. Ishikawa S. Oishi Y. Miyoshi N. Terada Y. Futaana F.S. Porter G.V. Brown 《Astronomische Nachrichten》2012,333(4):319-323
Recent results of charge exchange emission from solar system objects observed with the Japanese Suzaku satellite are reviewed. Suzaku is of great importance to investigate diffuse X‐ray emission like the charge exchange from planetary exospheres and comets. The Suzaku studies of Earth's exosphere, Martian exosphere, Jupiter's aurorae, and comets are overviewed (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Miyoshi Suzuki 《Solar physics》2012,278(2):257-267
We studied the solar rotation rate and its temporal change, using the sunspot data obtained during activity cycle 23 (1996 – 2006).
The equatorial rotation rate is nearly the same as in the former cycle 22, while the latitudinal gradient of differential
rotation considerably increased. Comparison of our results with others indicates the existence of a long-term periodicity
of about eight cycles in differential rotation. In addition, no significant asymmetry in differential rotation between the
northern and southern hemispheres during cycle 23 was found. The equatorial rotation rate and the latitudinal gradient of
the differential rotation in the period of cycle 23 are approximately constant, except for the initial and final phases in
the cycle. 相似文献