scholarly journals Source-rupture process of the 2011 Ibaraki-oki, Japan, earthquake (Mw7.9) estimated from the joint inversion of strong-motion and GPS Data: Relationship with seamount and Philippine Sea Plate

2013 ◽  
Vol 40 (12) ◽  
pp. 3003-3007 ◽  
Author(s):  
Hisahiko Kubo ◽  
Kimiyuki Asano ◽  
Tomotaka Iwata
Keyword(s):  
Joint Inversion ◽  
Strong Motion ◽  
Rupture Process ◽  
Philippine Sea Plate ◽  
Gps Data ◽  
Source Rupture Process ◽  
Philippine Sea

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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