scholarly journals OBSERVATION OF SEISMIC INTENSITY AND STRONG GROUND MOTION BY JAPAN METEOROLOGICAL AGENCY AND LOCAL GOVERMENTS IN JAPAN

2004 ◽  
Vol 4 (3) ◽  
pp. 75-78 ◽  
Author(s):  
Yuji NISHIMAE
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Seismic Intensity ◽  
Japan Meteorological Agency ◽  
Strong Ground

scholarly journals Source Model and Simulated Strong Ground Motion of the 2021 Yangbi, China Shallow Earthquake Constrained by InSAR Observations

2021 ◽  
Vol 13 (20) ◽  
pp. 4138
Author(s):  
Yongzhe Wang ◽  
Kun Chen ◽  
Ying Shi ◽  
Xu Zhang ◽  
Shi Chen ◽  
...  
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Surface Deformation ◽  
Source Model ◽  
Seismic Intensity ◽  
Deformation Pattern ◽  
Source Modeling ◽  
Ground Acceleration ◽  
Strong Ground Motion Simulation ◽  
Strong Ground

On 21 May 2021, an Mw 6.1 earthquake, causing considerable seismic damage, occurred in Yangbi County, Yunnan Province of China. To better understand the surface deformation pattern, source characteristics, seismic effect on nearby faults, and strong ground motion, we processed the ascending and descending SAR images using the interferometric synthetic aperture radar (InSAR) technique to capture the radar line-of-sight (LOS) directional and 2.5-dimensional deformation. The source model was inverted from the LOS deformation observations. We further analyzed the Coulomb failure stress (CFS) transfer and peak ground acceleration (PGA) simulation based on the preferred source model. The results suggest that the 2021 Yangbi earthquake was dextral faulting with the maximum slip of 0.9 m on an unknown blind shallow fault, and the total geodetic moment was 1.4 × 1018 Nm (Mw 6.06). Comprehensive analysis of the CFS transfer and geological tectonics suggests that the Dian–Xibei pull-apart basin is still suffering high seismic hazards. The PGA result demonstrates that the seismic intensity of this event reached up to VIII. The entire process from InSAR deformation to source modeling and strong ground motion simulation suggests that the InSAR technique will play an important role in the assessment of earthquake disasters in the case of the shortening of the SAR imaging interval.

Scaling relations for strong ground motion prediction models with M2 terms

1996 ◽  
Vol 86 (2) ◽  
pp. 329-336
Author(s):  
Yoshimitsu Fukushima
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Scaling Law ◽  
Quadratic Function ◽  
Japan Meteorological Agency ◽  
Source Spectrum ◽  
Strong Ground Motion Prediction ◽  
Positive Coefficients ◽  
Strong Ground ◽  
Spectrum Amplitude

Abstract In most previous studies on the attenuation relation of strong ground motion, the increase in amplitude with earthquake magnitude was expressed by a linear relation. However, if the ω−2 source model is assumed, the corner period of the spectrum varies with the magnitude, and the scaling law of the source spectrum amplitude becomes a complicated function of magnitude. The scaling relation of the spectrum amplitude with MW can be simply approximated as a quadratic function, and the coefficient of the MW2 term should be negative. On the contrary, positive coefficients of the ML2, mbLg2, and MJ2 (MJ: magnitude of Japan Meteorological Agency) terms have been derived by regression analyses of strong ground motions. Based on the ω−2 model, semi-empirical relations between Mo and the magnitudes were derived. Further, the seismological scaling law of the source spectrum obtained from the relation between Mo and the magnitudes was approximated as a quadratic function of the magnitude, and positive coefficients of the squared magnitude terms were obtained. These results stem from the definitions of magnitude derived from amplitudes of seismograms around a specific period of 1.0 sec for ML and mbLg and of 5.0 sec for MJ.

scholarly journals Experimental investigation of strong ground motion due to thrust fault earthquakes

2014 ◽  
Vol 119 (2) ◽  
pp. 1316-1336 ◽  
Author(s):  
Vahe Gabuchian ◽  
Ares J. Rosakis ◽  
Nadia Lapusta ◽  
David D. Oglesby
Keyword(s):  
Experimental Investigation ◽  
Ground Motion ◽  
Strong Ground Motion ◽  
Thrust Fault ◽  
Strong Ground
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