A coherency function model of ground motion at base rock corresponding to strike-slip fault

Spatial Coherency Model Considering Focal Mechanism Based on Simulated Ground Motions

“…The γ calculated by the proposed model is centered by the prediction of the Ding 2020 model proposed based on records. For rakes of 0 • , the curves predicted by the Ding 2004 model are approximately at the center of the shaded area. For rakes of 90 • , however, the curves predicted by the Ding 2003 model lie at the upper boundary of the shaded area.…”

“…For rakes of 90 • , however, the curves predicted by the Ding 2003 model lie at the upper boundary of the shaded area. The differences may come from the assumption of the Ding (2003Ding ( , 2004) models that adopts a line source model and a uniform single medium, and ignores the subfault energy distributed along the dip, as well as the scattering effect of seismic waves. In addition, both of the Ding models were developed at bedrock sites, leading to a slower decay of the γ than those given by other models.…”

“…On the other hand, theoretical coherency models are derived from basic principles of the random process theory, together with a few assumptions regarding the propagation of seismic waves [6]. Major efforts have been put into the improvement of the model through the consideration of more items to account for the wave-passage effect, the incoherency effect and the local site effect [19][20][21][22][23][24][25][26]. Among the existing models, Abarahamson's coherency model [15] and Loh's coherency model [14] are the most widely used.…”

“…The coherencies of the seismograms simulated based on the uniform single medium show that the seismic waves along different propagation paths are different, which proves that the fault strike is an important factor affecting the spatial coherency of ground-motion fields [30]. Two coherency models for bedrock sites were proposed for the strike-slip fault and the dip-slip fault, respectively [22,23]. So far, the influences of focal mechanism on the coherency models have still not been sufficiently investigated.…”

Simulation of Spatially Varying Ground Motions at Site with Stochastic Soil Layers: A Case Study in Nw Algeria

“…Most of the coherency models used in these methods of simulations are derived or regressed from strong motion data recorded by dense arrays such as the El-Centro array in California, the SMART-1 strong motion array in Taiwan, and the Parkway Valley array in New Zealand (see, for example, [4]). It is well known that coherency models calibrated from data collected in one region may not be suitable for use in other areas (see, for example, [5]; [6]; [7]; [8]). Despite this, due to lack of local data, which is the case in the current study area (epicentral region of the 1980 El-Asnam Earthquake in northwest Algeria), coherency models calibrated for one region are often used to simulate ground motion in other regions, sometimes with different tectonic and geological settings.…”