scholarly journals P-wave velocity structure in the northern part of the central Japan Basin, Japan Sea with ocean bottom seismometers and airguns

2004 ◽  
Vol 56 (5) ◽  
pp. 501-510 ◽  
Author(s):  
Takeshi Sato ◽  
Masanao Shinohara ◽  
Boris Y. Karp ◽  
Ruslan G. Kulinich ◽  
Nobuhiro Isezaki
Keyword(s):  
Wave Velocity ◽  
Velocity Structure ◽  
Japan Sea ◽  
P Wave ◽  
Ocean Bottom ◽  
Japan Basin ◽  
Central Japan ◽  
P Wave Velocity ◽  
Ocean Bottom Seismometers ◽  
P Wave Velocity Structure

P-wave velocity structure of the margin of the southeastern Tsushima Basin in the Japan Sea using ocean bottom seismometers and airguns

2006 ◽  
Vol 412 (3-4) ◽  
pp. 159-171 ◽  
Author(s):  
Takeshi Sato ◽  
Toshinori Sato ◽  
Masanao Shinohara ◽  
Ryota Hino ◽  
Minoru Nishino ◽  
...  
Keyword(s):  
Wave Velocity ◽  
Velocity Structure ◽  
Japan Sea ◽  
P Wave ◽  
Ocean Bottom ◽  
P Wave Velocity ◽  
The Japan Sea ◽  
Ocean Bottom Seismometers ◽  
Tsushima Basin ◽  
P Wave Velocity Structure

scholarly journals P-wave velocity structure in the southernmost source region of the 2011 Tohoku earthquakes, off the Boso Peninsula, deduced by an ocean bottom seismographic survey

2012 ◽  
Vol 64 (12) ◽  
pp. 1149-1156 ◽  
Author(s):  
Kazuo Nakahigashi ◽  
Masanao Shinohara ◽  
Kimihiro Mochizuki ◽  
Tomoaki Yamada ◽  
Ryota Hino ◽  
...  
Keyword(s):  
Wave Velocity ◽  
Velocity Structure ◽  
Source Region ◽  
P Wave ◽  
Ocean Bottom ◽  
Boso Peninsula ◽  
P Wave Velocity ◽  
P Wave Velocity Structure

Upper mantle P-wave velocity structure in the Japan region from travel-time studies of deep earthquakes using a new analytical method

1971 ◽  
Vol 61 (6) ◽  
pp. 1549-1570
Author(s):  
K. L. Kaila ◽  
V. G. Krishna ◽  
Hari Narain
Keyword(s):  
Wave Velocity ◽  
Calibration Curve ◽  
Velocity Gradient ◽  
Upper Mantle ◽  
Inflection Point ◽  
Velocity Structure ◽  
P Wave ◽  
Central Japan ◽  
P Wave Velocity ◽  
P Wave Velocity Structure

abstract The upper mantle P-wave velocity structure of the region of Japan has been studied in great detail from travel times of 107 earthquakes with focal depths varying from 40 to 600 km, using a new analytical method given by Kaila (1969). In southwestern Japan the P-wave velocity is found to be 7.88 km/sec at a 40-km depth, and it remains almost constant to a depth of 255 km. For northeastern Japan the velocity, determined as 7.88 km/sec at 40 km, increases linearly with moderate gradient to 8.14 km/sec at a 175-km depth. On the other hand, for central Japan the P-velocity is found to be 7.92 km/sec at a 40-km depth, and increases linearly with a high-velocity gradient to 8.33 km/sec at a depth of 180 km. Then, there is a slight decrease in the velocity gradient, but the velocity still increases linearly to 8.52 km/sec at a depth of 365 km. At this transition depth, there is a first-order velocity discontinuity—the velocity increasing from 8.52 to 9.10 km/sec. Below this depth, velocity again increases linearly from 9.10 to 9.99 km/sec at a depth of 600 km. Probable causes for these lateral-velocity inhomogeneities in the upper mantle of the Japan region are discussed. Graphs have been drawn to show the variation with depth of Δ*, the epicentral distance to the inflection point, (Δ2 − Δ1), ptrue = ∂T/∂Δ and ap = (T − pΔ) at the inflection point, the latter acting as a calibration curve for earthquake focal-depth determination in Japan. Using this calibration curve, focal depths are redetermined for all of the earthquakes under study for central Japan, and the same are compared with the values reported in the International Seismological Summaries.

Crustal P-wave velocity structure and earthquake distribution in the Jiaodong Peninsula, China

2021 ◽  
pp. 228973
Author(s):  
Junhao Qu ◽  
Stephen S. Gao ◽  
Changzai Wang ◽  
Kelly H. Liu ◽  
Shaohui Zhou ◽  
...  
Keyword(s):  
Wave Velocity ◽  
Velocity Structure ◽  
P Wave ◽  
Jiaodong Peninsula ◽  
P Wave Velocity ◽  
Earthquake Distribution ◽  
P Wave Velocity Structure
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