Parameterization of a Composite Attenuation Relation for the Dead Sea Area Based on 3-D Modeling of Elastic Wave Propagation

Oth, Adrien; Wenzel, Friedemann; Wust-Bloch, Hillel; Gottschämmer, Ellen; Ben‐Avraham, Zvi

doi:10.1007/s00024-006-0147-6

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…We suppose 'that the Dead Sea transform influences propagation of seismic waves in the region'. The regional attenuation characteristics are most likely affected by the presence of significant radiation anisotropy and a basin-related amplification effect in the Dead Sea region due to the trapping of the radiated energy, recently reported in the regional studies (Gottschammer et al 2002;Oth et al 2007). 'The contributions of the DST' to regional attenuation are not separated from 'bedrock' attenuation that may lead to biased estimates of the geometrical spreading function and other attenuation parameters.…”

Section: Discussion a N D C O N C L U S I O N Smentioning

confidence: 99%

“…Even smaller scale basin or lens structures of the order of several kilometres in diameter can produce substantial amplification of strong ground motions (Davis et al 2000). The facts of transmission and dissipation of seismic energy in the region are established in several studies of wave propagation (Wust‐Bloch 2002; Oth et al 2007). Concisely, we have to note that our estimates of apparent geometrical spreading at short distances are subjected to distortion, which may be linked with features of crustal structure of the region.…”

Section: Attenuation Relationshipsmentioning

confidence: 99%

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Weak-motion-based attenuation relationships for Israel

Meirova¹,

Hofstetter

Ben‐Avraham³

et al. 2008

Geophysical Journal International

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S U M M A R YWe performed a regional study of earthquake ground motion scaling relations to provide the seismic hazard community of Israel with a new attenuation relationship that could be used for the prediction of earthquake-induced ground motion. Strong earthquakes are rather scarce in Israel and the existing collection of records from strong earthquakes is not sufficient to allow the use of traditional regression methods to develop a regional attenuation relationship. We used velocity seismograms from the Israel Seismic Network to estimate the distance and frequency dependence of ground motion in the Israel region from frequent, smaller regional earthquakes. Our analyses included 4814 waveforms recorded by 30 stations of the Israel Seismic Network from 2000 to 2005. We restricted our analysis to 330 events recorded at five or more stations, with duration magnitudes ranging between 1.0 and 5.2. We derived empirical excitation, site and regional attenuation terms by regressing the peak amplitudes of narrowband-filtered seismograms around the shear wave arrivals and the rms Fourier spectral amplitudes taken around the specific sampling frequency. In order to optimize the attenuation parameters in our scaling model, we used a simple grid search. An optimal solution for minimal error between empirical and theoretical attenuation function was found for the quality parameter Q( f ) = 298 f 0.67 and the geometrical spreading g(r ) parametrized as a bilinear, piecewise function: r −0.74 for r ≤ 60 km and r −0.47 for r > 60 km. The spectral parameters κ of 0.015 s and stress drop increasing from 0.3 to 4 MPa were used to model the excitation spectra.A theoretical modelling effort based on Brune's source spectrum and Random Vibration Theory (RVT) was performed on the attenuation and source parameters estimated in this study. Comparison of the attenuation relationship derived with locally measured ground motions shows excellent agreement with the data in the magnitude range for which we have observations and seems to be adequate for predictions of earthquake ground motion for the Israel region. Comparison of Peak Ground Acceleration (PGA) predictions, based on our scaling relationship with those that have been recently used for seismic hazard analysis in Israel shows that our attenuation relationship predicts significantly lower ground motions than other relations.

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Section: Discussion a N D C O N C L U S I O N Smentioning

confidence: 99%

Section: Attenuation Relationshipsmentioning

confidence: 99%

Weak-motion-based attenuation relationships for Israel

Meirova¹,

Hofstetter

Ben‐Avraham³

et al. 2008

Geophysical Journal International

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“…The simulations are carried out by applying the 3‐D FD code of Olsen (1994) which is frequently used for earthquake wave propagation simulations (e.g. Olsen 2000; Gottschämmer et al 2002; Miksat et al 2005; Oth et al 2007). The code is of fourth order in space and second order in time.…”

Section: Modelling Techniquesmentioning

confidence: 99%

Simulating three-dimensional seismograms in 2.5-dimensional structures by combining two-dimensional finite difference modelling and ray tracing

Miksat

Müller

Wenzel

2008

Geophysical Journal International

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S U M M A R YFinite difference (FD) simulation of elastic wave propagation is an important tool in geophysical research. As large-scale 3-D simulations are only feasible on supercomputers or clusters, and even then the simulations are limited to long periods compared to the model size, 2-D FD simulations are widespread. Whereas in generally 3-D heterogeneous structures it is not possible to infer the correct amplitude and waveform from 2-D simulations, in 2.5-D heterogeneous structures some inferences are possible. In particular, Vidale & Helmberger developed an approach that simulates 3-D waveforms using 2-D FD experiments only. However, their method requires a special FD source implementation technique that is based on a source definition which is not any longer used in nowadays FD codes. In this paper, we derive a conversion between 2-D and 3-D Green tensors that allows us to simulate 3-D displacement seismograms using 2-D FD simulations and the actual ray path determined in the geometrical optic limit. We give the conversion for a source of a certain seismic moment that is implemented by incrementing the components of the stress tensor.Therefore, we present a hybrid modelling procedure involving 2-D FD and kinematic raytracing techniques. The applicability is demonstrated by numerical experiments of elastic wave propagation for models of different complexity.

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