scholarly journals HIGH-FREQUENCY WAVE GENERATION OF THE INTRA-SLAB EARTHQUAKES IN THE PHILIPPINE SEA PLATE FROM STRONG MOTION RECORDS : Comparison with the intra-slab earthquakes in Hokkaido and Tohoku districts

2004 ◽  
Vol 69 (586) ◽  
pp. 53-61 ◽  
Author(s):  
Takashi IKEDA ◽  
Masayuki TAKEMURA ◽  
Kenichi KATO
Keyword(s):  
High Frequency ◽  
Strong Motion ◽  
Wave Generation ◽  
Philippine Sea Plate ◽  
Frequency Wave ◽  
Strong Motion Records ◽  
Philippine Sea ◽  
High Frequency Wave

High-frequency radiation process during earthquake faulting—envelope inversion of acceleration seismograms from the 1993 Hokkaido-Nansei-Oki, Japan, earthquake

1997 ◽  
Vol 87 (4) ◽  
pp. 904-917 ◽  
Author(s):  
Yasumaro Kakehi ◽  
Kojiro Irikura
Keyword(s):  
High Frequency ◽  
Fault Plane ◽  
Source Region ◽  
Low Frequency ◽  
Strong Motion ◽  
Rupture Process ◽  
Wave Radiation ◽  
Radiation Process ◽  
Frequency Wave ◽  
High Frequency Wave

Abstract We investigate the process of high-frequency (1 to 10 Hz) radiation on the fault plane of the 1993 Hokkaido-Nansei-Oki, Japan, earthquake (MW = 7.5) from the envelope inversion of strong-motion acceleration seismograms. For the analysis, empirical Green's functions are used because theoretical approach is not available for such high frequencies. The source is modeled with two fault planes with different strike angles. The rupture process of this earthquake is very complex in terms of high-frequency wave generation. The rupture, which started on the northern fault plane, had a delay of about 10 sec or propagated very slowly between the northern and southern fault planes. High-frequency wave radiation is large at the northern and southern edges of the source region. Deceleration of rupture is also observed there. This is interpreted to be associated with stopping of rupture. Another high-frequency wave radiation area is found at the center of the northern fault plane, where discontinuity in the depth distribution of aftershocks suggests an existence of a barrier. The areas of high- and low-frequency wave radiation are not correlated. This is considered to result from the complexity of rupture process. We cannot distinguish between westward and eastward dip of the southern fault plane because of one-sided station distribution.

scholarly journals High‐Frequency Wave Generation in Magnetotail Reconnection: Linear Dispersion Analysis

2019 ◽  
Vol 46 (8) ◽  
pp. 4089-4097 ◽  
Author(s):  
J.L. Burch ◽  
K. Dokgo ◽  
K.J. Hwang ◽  
R.B. Torbert ◽  
D.B. Graham ◽  
...  
Keyword(s):  
High Frequency ◽  
Dispersion Analysis ◽  
Wave Generation ◽  
Linear Dispersion ◽  
Frequency Wave ◽  
High Frequency Wave ◽  
Magnetotail Reconnection

scholarly journals High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves

2019 ◽  
Vol 46 (14) ◽  
pp. 7873-7882 ◽  
Author(s):  
Kyunghwan Dokgo ◽  
Kyoung‐Joo Hwang ◽  
James L. Burch ◽  
Eunjin Choi ◽  
Peter H. Yoon ◽  
...  
Keyword(s):  
High Frequency ◽  
Wave Generation ◽  
Frequency Wave ◽  
High Frequency Wave ◽  
Magnetotail Reconnection ◽  
Hybrid Waves ◽  
Nonlinear Harmonics

scholarly journals Research of the process of vegetable oil extracting under the influence of a high frequency wave field

2020 ◽  
Vol 941 ◽  
pp. 012052
Author(s):  
V Yu Ovsyannikov ◽  
A A Berestovoy ◽  
N N Lobacheva ◽  
V V Toroptsev ◽  
S A Trunov
Keyword(s):  
Wave Field ◽  
Vegetable Oil ◽  
High Frequency ◽  
Frequency Wave ◽  
High Frequency Wave

Frequency-dependent attenuation of shear waves in the crust of the southern Kanto area, Japan

1994 ◽  
Vol 84 (5) ◽  
pp. 1387-1396
Author(s):  
Shigeo Kinoshita
Keyword(s):  
Shear Waves ◽  
Strong Motion ◽  
Body Waves ◽  
Philippine Sea Plate ◽  
Eurasian Plate ◽  
Philippine Sea ◽  
Motion Data ◽  
Basement Rocks ◽  
Acceleration Data ◽  
Attenuation Characteristics

Abstract The attenuation characteristics of shear waves in the crust of the southern Kanto area, central Japan, were estimated using strong-motion data, including acceleration data recorded in the pre-Tertiary basement rocks by means of downhole observation. The quality factor Qs(f) was determined for a range of discrete frequencies from 0.5 to 16 Hz from the analysis of data from 13 local earthquakes with focal depths of less than about 50 km that occurred in the Philippine Sea plate and in the boundary zone between the lower part of the Eurasian plate and the upper part of the Philippine Sea plate. The estimated 1/Qs(f) shows a peaked structure in this frequency range on the assumption that the geometrical spreading exponent is -1 (body waves). The estimated peak 1/Qs(f) is of the order of 10-2 at 0.8 Hz.

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