scholarly journals 3D Orthorhombic Earth Model Effects on Seismic Source Characterization.

2020 ◽  
Author(s):  
Richard Jensen ◽  
Leiph Preston
Keyword(s):  
Seismic Source ◽  
Earth Model ◽  
Source Characterization

BSHAP seismic source characterization models for the Western Balkan region

2017 ◽  
Vol 15 (10) ◽  
pp. 3963-3985 ◽  
Author(s):  
Jadranka Mihaljević ◽  
Polona Zupančič ◽  
Neki Kuka ◽  
Nataša Kaluđerović ◽  
Rexhep Koçi ◽  
...  
Keyword(s):  
Seismic Source ◽  
Source Characterization ◽  
Western Balkan Region ◽  
Balkan Region

Seismic Source Characterization

2017 ◽  
pp. 25-55
Author(s):  
Alain Pecker ◽  
Ezio Faccioli ◽  
Aybars Gurpinar ◽  
Christophe Martin ◽  
Philippe Renault
Keyword(s):  
Seismic Source ◽  
Source Characterization

Seismic Source Characterization for Greater Phoenix Area Earthquake Hazard

2015 ◽  
pp. 1078-7275.EEG-1618
Author(s):  
Simon T. Ghanat ◽  
Edward Kavazanjian ◽  
Ramon Arrowsmith
Keyword(s):  
Earthquake Hazard ◽  
Seismic Source ◽  
Source Characterization

scholarly journals Determination of Local Site-Specific Spectra Using Probabilistic Seismic Hazard Analysis for Bitlis Province, Turkey

2015 ◽  
Vol 19 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Ercan Işık ◽  
Mustafa Kutanis
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Seismic Hazard Assessment ◽  
Seismic Source ◽  
Response Spectra ◽  
Probabilistic Seismic Hazard Assessment ◽  
Probabilistic Seismic Hazard ◽  
Source Characterization ◽  
Site Specific ◽  
Attenuation Relationships

<p>In this study, site-specific earthquake spectra for Bitlis province in Lake Van Basin has been obtained. It is noteworthy that, in probabilistic seismic hazard assessment, as a first stage data from geological studies and records from the instrumental period were compiled to make a seismic source characterization for the study region.The probabilistic seismic hazard curves for Bitlis were developed based on selected appropriate attenuation relationships, at rock sites, with a probability of exceedance 2%, 10% and 50% in 50 year periods. The obtained results were compared with the spectral responses proposed for seismic evaluation and retrofit of the building structure in Turkish Earthquake Code, Section 2. At the end of this study, it is apprehended that the Code proposed earthquake response spectra are not sufficient for the performance evaluation of the existing structures and the current estimations show that the potential seismic hazard research of the Turkey is underestimated in the code.Therefore, site- specific design spectra for the region should be developed, which reflect the characteristics of local sites.</p><p> </p><p><strong>Determinación de espectros de sitio específico locales a través del análisis probabilístico de amenazas sísmicaspara la provincia de Bitlis, Turquía</strong></p><p> </p><p><strong>Resumen</strong></p>En este estudio se obtuvieron espectros de terremoto de sitio específico para la cuenca del Lago de Van, en la provincia de Bitlis, al este de Turquía. La primera fase del trabajo consistió en una evaluación probabilística de riesgo sísmico donde se compilaron los estudios geológicos y registros del período instrumental para hacer una caracterización de fuente sísmica en la región de estudio. Las curvas de amenaza sísmica para la provincia de Bitlis se desarrollaron con base en las relaciones de atenuación apropiada seleccionadas en los sitios rocosos, con una probabilidad de exceso de 2 %, 10 % y 50 % durante 50 años. Los resultados obtenidos se compararon con las respuestas de espectro propuestas para la evaluación sísmica y modernización de estructuras contempladas en el Código de Terremoto de Turquía, en la sección 2. En la parte final de este trabajo se comprende que las respuestas de espectros de terremoto propuestos en el código no son suficientes para la evaluación de desempeño de las estructuras existentes y que las estimaciones actuales muestran que la investigación de amenazas potenciales sísmicas en Turquía está subestimada en el código. Por lo tanto, el diseño de espectros de sitio específico para la región se debe desarrollar, ya que permitiría conocer las singularidades locales.</p>

Marine Seismic Source Characterization Using Fiber Optic Sensors

2019 ◽  
Author(s):  
Ezzedeen Alfataierge ◽  
Nikolay Dyaur ◽  
Li Chang ◽  
Robert R. Stewart
Keyword(s):  
Fiber Optic ◽  
Seismic Source ◽  
Fiber Optic Sensors ◽  
Source Characterization ◽  
Marine Seismic

Fault Source Characterization of Probabilistic Seismic Hazard Analysis for the Sites of Offshore Wind Turbine in Taiwan

2015 ◽  
Vol 764-765 ◽  
pp. 1085-1089
Author(s):  
Cheng Yu Pan ◽  
Yuan Chieh Wu
Keyword(s):  
Wind Turbine ◽  
Seismic Design ◽  
Hazard Analysis ◽  
Active Faults ◽  
Seismic Source ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Source Characterization ◽  
Heavy Damage

During seismic hazards, offshore wind turbine structures do not have direct effects on people's safety; however, the seismic design is still important to prevent heavy damage on structure. The seismic design of offshore wind turbine has been discussed in some previous studies. Based on the result of those studies, we further modified the seismic source, especially on active faults in west foot hill zone. Of all the active faults in this area, we choose five which lie nearby the sites to make the modification. A logic tree has been set to avoid overlapping and derive an accurate recurrence model of the seismic source used in PSHA. This study is just a preliminary result of PSHA in wind turbine sites, Chunan and Chanbin, there are still several adjustments need to be done.

Seismic source inversion using Hamiltonian Monte Carlo and a 3-D Earth model in the Japanese Islands

2020 ◽  
Author(s):  
Saulė Simutė ◽  
Lion Krischer ◽  
Christian Boehm ◽  
Martin Vallée ◽  
Andreas Fichtner
Keyword(s):  
Monte Carlo ◽  
Moment Tensor ◽  
Seismic Source ◽  
Monte Carlo Algorithm ◽  
Earth Model ◽  
Model Parameters ◽  
Hamiltonian Monte Carlo ◽  
Double Couple ◽  
Full Moment Tensor ◽  
Japanese Islands

&lt;p&gt;We present a proof-of-concept catalogue of full-waveform seismic source solutions for the Japanese Islands area. Our method is based on the Bayesian inference of source parameters and a tomographically derived heterogeneous Earth model, used to compute Green&amp;#8217;s strain tensors. We infer the full moment tensor, location and centroid time of the seismic events in the study area.&lt;/p&gt;&lt;p&gt;To compute spatial derivatives of Green&amp;#8217;s functions, we use a previously derived regional Earth model (Simut&amp;#279; et al., 2016). The model is radially anisotropic, visco-elastic, and fully heterogeneous. It was constructed using full waveforms in the period band of 15&amp;#8211;80 s.&lt;/p&gt;&lt;p&gt;Green&amp;#8217;s strains are computed numerically with the spectral-element solver SES3D (Gokhberg &amp; Fichtner, 2016). We exploit reciprocity, and by treating seismic stations as virtual sources we compute and store the wavefield across the domain. This gives us a strain database for all potential source-receiver pairs. We store the wavefield for more than 50 F-net broadband stations (www.fnet.bosai.go.jp). By assuming an impulse response as the source time function, the displacements are then promptly obtained by linear combination of the pre-computed strains scaled by the moment tensor elements.&lt;/p&gt;&lt;p&gt;With a feasible number of model parameters and the fast forward problem we infer the unknowns in a Bayesian framework. The fully probabilistic approach allows us to obtain uncertainty information as well as inter-parameter trade-offs. The sampling is performed with a variant of the Hamiltonian Monte Carlo algorithm, which we developed previously (Fichtner and Simut&amp;#279;, 2017). We apply an L2 misfit on waveform data, and we work in the period band of 15&amp;#8211;80 s.&lt;/p&gt;&lt;p&gt;We jointly infer three location parameters, timing and moment tensor components. We present two sets of source solutions: 1) full moment tensor solutions, where the trace is free to vary away from zero, and 2) moment tensor solutions with the isotropic part constrained to be zero. In particular, we study events with significant non-double-couple component. Preliminary results of ~Mw 5 shallow to intermediate depth events indicate that proper incorporation of 3-D Earth structure results in solutions becoming more double-couple like. We also find that improving the Global CMT solutions in terms of waveform fit requires a very good 3-D Earth model and is not trivial.&lt;/p&gt;

scholarly journals Seismic Hazard Assessment for a Wind Farm Offshore England

Geotechnics ◽  
2022 ◽  
Vol 2 (1) ◽  
pp. 14-31
Author(s):  
Brian Carlton ◽  
Andy Barwise ◽  
Amir M. Kaynia
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
North Sea ◽  
Wind Farm ◽  
Seismic Source ◽  
Offshore Wind ◽  
Source Characterization ◽  
North East ◽  
Seismic Source Models ◽  
Source Models

Offshore wind has become a major contributor to reducing global carbon emissions. This paper presents a probabilistic seismic hazard analysis for the Sofia Offshore Wind Farm, which is located about 200 km north-east of England in the southern North Sea and will be one of the largest offshore wind farms in the world once completed. The seismic source characterization is composed of two areal seismic source models and four seismic source models derived using smoothed gridded seismicity with earthquake catalogue data processed by different techniques. The ground motion characterization contains eight ground motion models selected based on comparisons with regional data. The main findings are (1) the variation in seismic hazard across the site is negligible; (2) the main source controlling the hazard is the source that includes the 1931 Dogger Bank earthquake; (3) earthquake scenarios controlling the hazard are Mw = 5.0–6.3 and R = 110–210 km; and (4) the peak ground accelerations on rock are lower than for previous regional studies. These results could help guide future seismic hazard assessments in the North Sea.

Sign in / Sign up

Export Citation Format

Share Document